2020 GMC Terrain Problems & Complaints
Real owner complaints and problems reported to the National Highway Traffic Safety Administration (NHTSA). View common issues by component.
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157
Complaints Reported
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Complaints by Component
SERVICE BRAKES
29 complaints
While driving down the interstate a notice popped up on my dash about the brake assist. When I attempted to slow down the vehicle to safely pull over the brake pedal was very hard to push. I was able to slow the vehicle to a complete stop but needing to use both feed and press hard with all my weight. Once the vehicle was parked and shut off I turned it back on to have the check engine light pop up on the dash. I contacted Onstar and was towed to a dealership. The brake vacuum pump had broken off at the cam shaft and required extensive repairs. It is my understanding that this is a common occurance and there were previous recalls on the other style Terrains due to the same issue. yet they used the same part on the newer body style being fully aware of the design flaw.
Jan 06, 2026
Since August 2024, my brake booster has gone a total of five times each time with the notification on the dash service brake assist. And it just went again as of two days ago. I’ve brought it to Firestone where they have replaced it each time with a warranty on the part. I called them yesterday to tell them that it went again and they refused to fix it telling me that they got the part from the dealership and that I would have to take it there so the dealership would have to figure out what’s wrong with it as to why the car is “chewing up” the part. I have young kids and this part has gone five times.
Dec 16, 2025
While driving my brakes failed. I was unable to stop my car, my brake pedal became very stiff and I could not stop my car. There were no warning signs or lights on indicating there were any issues with my car prior to this happening. I had to have my car towed to the dealer. The current estimate is for a vacuum pump failure resulting in camshaft damage. Both need to be replaced. I see other GMC cars were recalled for what appears to be a similar issue. I am lucky no one was injured as this could have very easily resulted in a fatal event. I have never heard of such a thing happening before and am beyond belief that this has occurred. This is the third repair I've had done this year. I have also replaced a booter pipe and valve gasket due to leaking oil. The amount of repairs required in such a short a time seems excessive.
Dec 03, 2025
While driving on a main road at around 45mph the vacuum pump that supplies brake fluid to the brakes failed. The car was unable to be stopped and had it not been late in the night I could have crashed into other vehicles on the road or hit someone walking. There was not indication prior to the malfunction and was very sudden. This issue has been observed by the dealer as well as multiple other individuals with the same problem for this make and model of car as well as others by the same manufacturer for similar years of manufacturing. This part has also been shown to break into the engine causing complete engine failure due to lack of a shear pin on the vacuum pump.
Nov 30, 2025
Vacuum pump went out. It was a recall, previously on older models, but this model needs to
Nov 13, 2025
+ 24 more complaints for this component
UNKNOWN OR OTHER
15 complaints
The rear backup camera in my 2020 GMC Terrain failed. I first noticed and noted that the image was 'cloudy' on 5/3/2023, and it became very bad by 1/22/2024. On 7/1/2024, the image stopped working completely, replaced with a blue screen on the dashboard screen. I ordered a new camera and replaced it myself on 8/1/2024. Because the dealership did not mention any safety effects or recalls, and instead quoted me a very expensive repair estimate, and the vehicle was out of its 3 year warranty, I assumed it was my responsibility to repair this feature. However, I have seen recent news articles where other vehicles have been recalled by NHTSA for similar problems with backup cameras.
Nov 22, 2025
I was driving on the highway below the speed limit when I heard a pop that sounded like a balloon and instantly the sound of wind getting into the car. I pulled over and found that the sunroof was rapidly shattering. I did not see a rock that had hit it. Maybe the tempered glass just exploded. I was not driving very close by any other vehicles at the time, but was on the highway.
Nov 08, 2025
The Vehicle Identification Number for this vehicle is not recognized in the NHTSA program. From Online vehicle registration Oahu Hawaii
Oct 23, 2025
Back up camera does not work. It shows a blue screen and says service repair needed.
Sep 09, 2025
The bolts fell out and the bracket that holds the drive shaft in place fractured while driving.
Aug 19, 2025
+ 10 more complaints for this component
ENGINE
10 complaints
This message concerns a persistent engine light that activates and generates engine code P0299, indicating an engine underboost issue. There have been several occasions where I am driving over 55mph on the highway and my 2020 Terrain SLT fails to pick up speed over 60mph in traffic. I took it to my GMC dealer earlier this year for them to diagnose, and they discovered that the charge air cooler tube had collected moisture. Once that was fixed, the vehicle was fine for about a month when the same thing happened. I took it to another GMC dealer and found that the turbocharger wastegate actuator had to be replaced. Once replaced, I had no problems until it began to get cold where I live. Now the vehicle is doing the same thing. Now what happens is the engine light will come on and give the engine underboost message but goes away after a week of driving. I have taken it to 2 dealers for diagnosis, only for the engine light to disappear before they can figure out what the problem is now. This continues to be an issue, as I frequently drive on the highway over 55mph for work, errands, etc., and presents a potential hazard if I have to pick up speed and can't on a major highway.
Dec 18, 2025
First problem was when the ac went out which affected the starter 2 weeks after that while I was driving something popped underneath the vehicle the vehicle completely stopped working when I checked underneath the vehicle there was leak ish a broken crankshaft car would not turn back on….
Sep 13, 2025
While my wife was driving on [XXX] speed (60 –70 mph), the engine suddenly seized without warning. This created a dangerous situation, especially at that speed. Upon inspection, it was confirmed that a camshaft end cap detached, causing catastrophic internal engine damage. I believe this may be due to a manufacturing defect or insufficient part durability, and poses a serious safety risk to myself and other drivers. Please investigate this issue for broader safety concerns and potential recalls, especially if other owners report similar failures. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Jun 18, 2025
The contact owns a 2020 GMC Terrain. The contact stated that while his daughter was driving at an undisclosed speed, an unknown warning light displayed on the instrument panel. The vehicle started losing motive power and the vehicle shut off while in a parking lot. The contact was notified of the failure and a tow truck was contacted. While waiting for the tow truck to arrive, the contact's daughter was able to restart the vehicle and drive to the residence. The dealer was notified of the failure the following day and the vehicle was towed to the dealer. The contact stated that a diagnostic test was performed, and the contact was informed that metal shavings were found inside the engine and the vehicle was diagnosed with engine failure. The manufacturer was notified of the failure but offered no assistance. The contact was referred to the NHTSA Hotline to report the failure. The vehicle was not repaired. The failure mileage was approximately 67,000.
Sep 16, 2024
Car was very well maintained 2020 GMC Terrain, no warnings prior to the issues. Car started shaking while driving, would not allow me to accelerate without chugging, multiple lights came on including flashing check engine light. Somehow the whole motor and engine needs replaced.
Sep 16, 2024
+ 5 more complaints for this component
ELECTRICAL SYSTEM
9 complaints
Towards the tail end of a nearly 2.5 hour drive, the Automatic Theft Deterrent System was activated on the interstate. I lost every display on the dash panel including my speedometer, battery, coolant, gas, turn signals, and windshield wipers. I went into the nearest parking lot and was unable to restart the vehicle. It was towed to the dealership closest to our home and was repaired for $2200. The technicians at the dealership were not sure of what caused it and had never seen an issue like this so it was “elevated” to the GM engineers at their headquarters. They replaced the electrical control module and both key FOBs. We have not experienced any similar issues.
Dec 29, 2025
Backup camera not working and has a blue screen. The camera was replaced. The fuses & wires were inspected and the screen remains blue.
Oct 05, 2025
Sunroof/moonroof/sunshade and frame leaking for 2nd time.
Aug 26, 2025
Vehicle has not recently been inspected, backup camera has recently gone out leaving only a blue screen with "service rear vision system" to my knowledge nothing has happened to the unit that would cause this. Regular day to day driving, there was nothing that would have given me any notice that this would be happening.
Dec 17, 2024
Driving down the road at 40mph when the car shifts to park, the brake and steering wheel lock up and the car won’t accelerate. I had to pull over because I almost crashed due to the abrupt shift. Once pulled over I tried to restart the car but once off and back on it wouldn’t allow me to shift or drive it. The steering wheel and brake remained locked. It has happened several times over the past week.
Oct 05, 2023
+ 4 more complaints for this component
POWER TRAIN
9 complaints
The contact owns a 2020 GMC Terrain. The contact stated that while driving 35 MPH and depressing the accelerator pedal while driving uphill or making a left or right turn, the tires were skipping, and there was a clicking and whining sound coming from the front of the vehicle. There was no warning light illuminated. The contact stated that a friend test-drove the vehicle and informed that the vehicle had experienced transmission failure. Neither the independent mechanic nor the dealer was contacted. The vehicle was not taken to the dealer or an independent mechanic to be diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 20V668000 (POWER TRAIN); however, the VIN was not included in the recall. The manufacturer was notified of the failure and informed the contact that the VIN was not included in the recall. The failure mileage was 104,000.
Dec 19, 2025
The contact owns a 2020 GMC Terrain. The contact stated that while making a turn, the transmission shifted into neutral and briefly lost motive power and stalled. No warning lights were illuminated. The contact was able to restart the vehicle; however, the vehicle failed to function while shifting to drive(D) or reverse(R). The contact opened and closed the door to see if the vehicle would reboot. After several attempts, the vehicle returned to normal functionality. The contact stated that on a separate occasion, the transmission was leaking transmission fluid. The transmission was constantly slipping. The check engine warning light was intermittently illuminated. The vehicle was taken to the dealer, where it was diagnosed that the START/STOP accumulator in the cap was missing bolts, which caused the transmission to fail. An unknown code was provided to the contact. The vehicle was not repaired due to the cost. The vehicle was taken to various independent mechanics who confirmed that the transmission had failed. The manufacturer was made aware of the failure. The failure mileage was approximately 94,000.
Oct 08, 2025
I have been experiencing loss of power when going from a full stop to acceleration. I purchased my 2020 Terrain. I almost got in a car accident for the 3rd time today due to this loss of power issue. Stopped at a stop sign, I accelerate but the vehicle will barely move no matter how far down you push the peddle down. The loss of power is anywhere from 4 to 6 seconds then all of the sudden power will return. I've looked for recalls but there are none for my vin. This behavior is unpredictable and has occurred at stop signs, traffic lights, and when attempting to turn onto main roads. It has nearly caused accidents due to my inability to safely accelerate in time when merging or crossing traffic. I’ve read that GMC recalled certain 2021 and 2022 Terrain models for a fuel pump defect causing similar symptoms. My 2020 model is not currently included in that recall, yet it displays the same dangerous loss-of-power issue. I believe this is a serious safety defect that should be investigated and potentially included in the existing recall. I respectfully request that NHTSA investigate this issue further. I would also appreciate confirmation that this report has been logged. Vehicle Info: 2020 GMC Terrain VIN: [XXX] Engine: 1.5L Turbo Mileage: 62,142 Thank you for your time and your work in ensuring vehicle safety. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Jul 12, 2025
Gear selector
Feb 21, 2025
The engine in my 2020 GMC Terrain is consuming oil at an alarming rate, burning through a full supply within one hour of operation. This excessive oil consumption has repeatedly caused significant damage to the coils and spark plugs, rendering them ineffective within 24 hours. The issue has led to multiple cylinder misfires, poor vehicle performance, and a transmission stall, posing a serious safety risk while driving. The GMC mechanic at Jim Ellis Buick GMC diagnosed the problem as internal damage to the pistons, which they state requires a full engine replacement. They also confirmed an internal oil leak within the engine, which is contributing to bad emissions and further degrading vehicle performance. This defect not only compromises the reliability and safety of the vehicle but also raises significant environmental concerns due to the excessive oil burning and emissions. I am requesting a thorough investigation to address this issue and determine whether it is part of a broader manufacturing defect affecting similar vehicles.
Jan 01, 2025
+ 4 more complaints for this component
SERVICE BRAKES,ENGINE
7 complaints
Driving down the road and an engine power reduced light came on and then the driver was not able to apply the breaks to stop the car. Almost ran into a car at a 4 way stop before getting the car to stop.
Sep 10, 2025
Driving down busy highway and suddenly had no brakes!!! No lights came on dashboard as a warning. Found out it was a braking pump that broke and shot metal pieces into the engine. Now im facing a new engine for a 2020 terrain!!
Sep 09, 2025
As I was driving down the Ohio Turnpike on my way to work on Tuesday, August 5, 2025, my check engine light came on. Almost immediately I got a notification that the car was operating at reduced power. I had no previous issues with the vehicle. As I got off the turnpike my braking system failed. I was able to come to a stop partially in the grass before entering into oncoming traffic. The entire car shut down. I was unable to restart the car. We were also unable to put the car into neutral to push it off of the road the remainder of the way because the wheels were completely locked up at this point. The parking brake was engaged on its own. We also could not get the car into neutral. I had the car towed to a local repair shop, not knowing at all what the issue was. The vacuum pump had failed and broke apart in the engine. This caused my braking system to fail completely also. The vacuum pump on my 2020 GMC terrain has been noted as faulty or defective. However, an official recall has not been issued for my vehicle. Had the pump failed a moment sooner I could have been in a crash trying to exit the turnpike. I took my vehicle to a repair shop and spent $1400 out-of-pocket. The car still does not run correctly now as there are pieces in the engine of my vehicle that were unable to be retrieved.
Aug 26, 2025
GMC techs have already documented this issue could not be caused by wear and tear or lack of service - of which there is none the car has been serviced every10k miles as advised. GMC coperate has been contacted case # 71853883 The vacuum pump has failed due to MECHANICAL FAILURE causing it to explode and send pieces into the camshaft. The lack of vacuum caused complete brake failure rendering the car unsafe. GMC is aware of the issue as others habe reported it (I have proof of this) and refuses to recall the cars. The cars loose breaking in the middle of driving with no indicator lights or any other indications. The breaks had just been replaced in may - the incident occurred in October. Has not been driven since.
Aug 14, 2025
In September 2024 i was driving down the freeway and my car shuttered like the transmission was slipping. I then proceeded to get over into the right hand lane incase i needed to pull over thankfully, because then i lost use of my breaks, and then my ability to accelerate and steer. Then my car just shut off and would not stop. My vacuum pump just broke with no warning, it has been replaced and my car still won't start, it's going on 5 months now and they still can't figure out why.
Jan 09, 2025
+ 2 more complaints for this component
FUEL/PROPULSION SYSTEM
6 complaints
Re: 2020 GMC Terrain. Our fuel pump control module (FPCM) unexpectedly failed after driving a short distance. Vehicle stalled without warning on the street and was unable to be started again. This could have resulted in a crash and/or injury to other people in the area. An independent service center suspected an issue with the module but was unable to make an official diagnosis. The vehicle was towed to the local GMC dealer who confirmed the FPCM failure and needed to be replaced at a cost of $850. There were no warning indicators prior to the incident and the vehicle's display only showed "battery saver mode" after stalling on the street.
Dec 11, 2025
Having problems with fuel system
Apr 10, 2025
Vehicle stalled while stopped in middle lane during rush hour traffic. Vehicle would not start, and could not be put in neutral to be pushed to side of road. Vehicle was towed to repair shop where they needed to replace the fuel pump control module. The automotive repairmen stated they have seen this with multiple GMC vehicles and they do not understand how it has not been recalled yet because, as they stated, it is going to get someone killed one day.
Mar 12, 2025
On Wednesday, June 26, 2024 my 2020 gmc terrain unexpectedly malfunctioned and failed to restart. The engine light came on and I attempted to restart it for nearly 2 hours with no success. Fortunately, it finally started and once I got it home my fiancé plugged the car up to the code reader. P129F “Manufacturer Control” were the results. After further researching, this is for the fuel pump/fuel pump control modular assembly. In January 2023, NHTSA released a notice for my exact vehicle for this very scenario I experienced. And as of June 6th, 2024 a class action lawsuit was filed against gmc for this issue as well. My vehicle is not able to be repaired due to 1) my vin not being included on the recall list and 2) all the parts that were in inventory are also deemed unsafe due to the lawsuit documents shared online and this has caused a nationwide back order per my conversation with 3 gmc/chevy dealerships. At this point my vehicle is unreliable and unsafe to transport myself or my children.
Jul 01, 2024
I had been fishing at the lake and went to leave and when I got in my car I put it in reverse and backed up then put in drive to pull forward, only I pushed the throttle all the way to the floor and the vehicle was completely unresponsive. I put it back in reverse and backed up a little more then put back in drive and same thing happened. I then put it in neutral and have it gas and with the pedal to the floor it barely revved the engine at all. I put it back in drive and floored it again and started turning the when from side to side still nothing. I put it in park then back in drive and with the gas pedal to the floor it barely started to creep forward. It continued to creep for about 40ft then all of a sudden the throttle worked and vehicle jerked forward. 2 days later I was driving in town with my daughter in the car and slowed down before turning up a steep hill and the vehicle did the same thing. Gas pedal to the floor and wouldn't accelerate. Only this time I almost got rear ended. I have contacted the dealer and told them I need a loaner while my vehicle is fixed and their response was "I don't know what to tell you we don't have any". I called GM and they said they would contact the dealer and see if they just don't have any loaners available or of they don't offer them and said they would call me back. The end of the next day I still haven't heard from them so I reach out to them again this time being told "an owning advisor has already handled your claim, sorry you haven't been updated yet". I don't need updates, I need a safe vehicle for me and my kids! My car has only 57XXX miles plus I bought a 100,000 extended warranty. Please hold GM accountable for their poor quality of vehicles and even worse customer service!
May 04, 2022
+ 1 more complaint for this component
SERVICE BRAKES, HYDRAULIC
5 complaints
The contact owns a 2020 GMC Terrain. While the contact’s wife was driving approximately 40 MPH and attempting to depress the brake pedal to pull into the parking lot of Walmart, the braking distance was extended while bringing the vehicle to a complete stop. The driver used excessive force on the brake pedal using both feet. The vehicle was towed to a certified mechanic, who diagnosed the vehicle and determined that the brake vacuum pump had failed. The vacuum pump had fractured where it was connected to the camshaft, causing pieces to enter the engine. The brake vacuum pump and the connector were replaced. The manufacturer was made aware of the failure. The failure mileage was approximately 156,000.
Jan 05, 2026
The contact owns a 2020 GMC Terrain. The contact stated that while driving up the driveway at approximately 10 MPH, the brake pedal was depressed but failed to function as intended. The contact used force to depress the brake pedal. When the vehicle came to a stop, there was an abnormal grinding sound coming from the front brakes. The contact stated that the message "Power Assist Brakes" was displayed on the instrument panel. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 198,000.
Dec 02, 2025
The contact owns a 2020 GMC Terrain. The contact stated while driving 40 MPH the "Brake Assist" warning light illuminated. The contact attempted to depress the brake pedal, but the pedal was stiff. The contact was unable to depress the pedal. The vehicle was taken to a local dealer and unknown repairs were performed. The vehicle was repaired; however, recently the failure reoccurred. The contact stated that the "Brake Assist" warning light illuminated, and the brake pedal was difficult to depress. The vehicle was not taken to a dealer or an independent mechanic to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 162,000.
Jul 07, 2025
The contact owns a 2020 GMC Terrain. The contact stated that while driving at slow speeds in a parking area and attempting to stop, the brake pedal failed to depress all the way to the floorboard and was firm, requiring an increased effort; however, the vehicle failed to stop as intended. The contact was able to bring the vehicle to a complete stop by turning the vehicle off. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the brake vacuum pump, observing that the pump had sent metal fragments into the engine, resulting in damages to the engine. The vehicle was not repaired. After investigating the failure, the contact related the failure to Special Coverage Adjustment: N182202780. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 108,000. The VIN was not available.
Mar 04, 2025
The contact owns a 2020 GMC Terrain. The contact stated while driving 20 MPH, while attempting to slow down, the brake pedal was depressed; however, the brake pedal felt abnormally stiff. In addition, the vehicle hesitated to come to a complete stop. The contact became aware that the driver's side and passenger’s side struts had failed. The check engine warning light was illuminated. The vehicle was taken to the dealer where it was diagnosed that the brake vacuum pump needed to be replaced. The brake vacuum pump was replaced, and the vehicle was repaired. The manufacturer was notified of the failure and referred the contact to the dealer for assistance. The approximate failure mileage was 17,361.
Jan 14, 2025
FUEL SYSTEM, GASOLINE
4 complaints
The contact owns a 2022 GMC Terrain. The contact stated while depressing the accelerator pedal from a complete stop, the vehicle lost motive power and started shaking and then shut off. Several unknown warning lights were illuminated. The contact attempted to restart the vehicle; however, the vehicle failed to respond. A dealer was contacted. The vehicle was towed to the residence first and was then towed to a dealer to be diagnosed. The contact was informed that the fuel pump module needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 58,000.
Sep 10, 2025
The contact owns a 2020 GMC Terrain. The contact stated that while his wife was driving 5 MPH and exiting a parking lot, the vehicle inadvertently stalled. There was no warning light illuminated. The vehicle failed to restart. The messages "Low Battery" and "Start the Vehicle" were displayed. The contact stated that the brakes had seized. The vehicle was towed to the dealer, where it was diagnosed and determined that the fuel pump and the fuel pump driver control module needed to be replaced. The vehicle was being repaired. The manufacturer was notified of the failure and informed the contact that the vehicle was not covered under warranty. The failure mileage was 45,175.
Dec 12, 2024
The contact owns a 2020 GMC Terrain. The contact stated that while attempting to restart the vehicle, the vehicle failed to start. The vehicle was towed to the local dealer who diagnosed that the fuel pump was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not yet notified of the failure. The failure mileage was 42,000.
May 25, 2023
The contact owns a 2020 GMC Terrain. The contact stated that after refueling the vehicle, the vehicle failed to restart. The message "Battery Low - Start Vehicle" was displayed. The vehicle was towed to the dealer, where it was diagnosed that the fuel sensor module and fuel pump needed to be replaced. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 23V013000 (Fuel System, Gasoline); however, the VIN was not included in the recall. The manufacturer was not made aware of the failure. The failure mileage was approximately 42,510.
Mar 22, 2023
POWER TRAIN,ELECTRICAL SYSTEM,ENGINE
4 complaints
[XXX] once again while diving down the road 45mph Terrain once again goes in to park ,I was lucky the lady behind me wasn't to close .Also I contacted onstar when I was able to get vehicle moving at the store ..I told her what happen she ran diagnostics while parked at store said there was no codes I let onstar know this has happened several times..I had no warning, no indication, no lights came on.And I also let her know that this same vehicle was still stalling I was at intersection and the auto/stop is always on it will not let you bypass or default took it to dealership who I bought CPO back when it first would not let me turn it off cause its stalls at stop signs ,red lights etc crazy thing is if you turn the ac on it cranks up , if you hit the door unlock it starts... Thats not normal GMC knows that the dealership whom sold me CPO that wasn't the misleading is beyond crazy..GSM cussed me out It comes with life time warranty but when I had it towed right after I bought it 2 months ..I was talking about what the mechanics had said that this vehicle was in prior flood and accident GMC onstar has a different Vin then the one that on the vehicle..The doors are not original I can see the inside of steering wheel and on dash where they said air bags were deployed and they did a [XXX] job hiding it ... I paid over 32k for this 2020 Terrain that was advertised as CPO with 1 owner in Florida they showed me a fraudulent carfax, I pulled up my own and it came from New York ..This vehicle is not safe to drive but I dont have any other options..I have made complaint with both GMC and my finance company whom also wrote complaint on dealership and the told me I could rewind the loan but when I told dealership I knew that they sold me a vehicle that was not CPO and what I learned He came at me at dealership infront of workers and customers .. The vehicle just going to end up getting myself killed or someone else.. Semi had to run off road to avoid hitting me INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Jun 03, 2025
The vehicle is a 2020 and should not already be having electrical issues. The vehicle repair is over 5k for needing a starter motor, water pump and drive belt. A starter should last up to 100k miles and water pump should last 10 years not 4. This vehicle is a lemon and should not have so many issues.
Aug 20, 2024
2020 GMC Terrain SLE Elevation Package 83,000 miles and needs complete engine rebuild @ cost of $10,700 per Dealership Service. Was told “I drove the vehicle with low oil” which Inturn is the cause of needing engine rebuilt. I have had this vehicle serviced, oil changed regularly etc NOT ONE TIME has the oil pressure/low engine oil nor anything related to oil illuminated on my dash. CEL yes after it apparently was too late and damage was done which showed code P06DD And P0324 through OnStar Diagnostics. There are also other complaints with same issue, and no notification of oil /oil pressure issues with relatively low mileage that have led to engine rebuild. I still owe on this vehicle through GM Financial, and a $10,200 engine rebuild on top of that… Not what I would expect out of GMC~
Aug 05, 2023
WE DROVE TO A FARM WITH A FAMILY OF 5M KIDS AND AN ELDERLY, AND PARKED MY CAR FOR 2-3 HOURS IN THE FARM'S OPEN AREA PARKING LOT. VEHICLE SHOWED NO WARNING LIGHTS, NO PROBLEMS, NO ISSUES DURING OUR DRIVE TO THE FARM AND PRIOR TO THIS TRIP. EVERYTHING WAS FINE WHEN WE GO THERE AND PARKED. WE WERE READY TO LEAVE THE FARM TO DRIVE BACK HOME, BUT THE CAR SIMPLY WOULDN'T START.THE NEUTRAL GEAR DIDN'T WORK, I ATTEMPTED MANY TIMES IN 30 MINUTES TO START THE CAR, BUT IT DIDN'T START, CONTINUED MAKING THE SOUND OF ENGINE ATTEMPTING TO START BUT NOT SUCEEDING. 30 MINUTES LATER, I DECIDED TO GIVE IT ANOTHER TRY, I WAS AFRAID TO BURN DOWN THE STARTER AFTER ATTEMPTING SO MANY TIMES. IT SOUNDED TERRIBLE, SCREECHING METAL SOUND. ALL OF A SUDDEN, THE CAR STARTED. I LET IT RUN, AFRAID TO TURN IT OFF AGAIN. AFTER 15 MINUTES OF RUNNING, WHILE WE WERE WAITING FOR ROADSIDE ASSISTANCE TO ARRIVE, THE VEHICLE TURNED OFF AGAIN, ALL BY ITSELF. NO ONE WAS INSIDE THE CAR, WE WERE WAITING OUTSIDE WITH THE DRIVER DOOR WIDE OPEN. I CALLED ROADSIDE ASSISTANCE, WAITED 40 MINUTES TO GET A LIVE AGENT TO TALK TO. THE YELLOW ENGINE LIGHT IS ON. I TRIED TO LOOK IN THE MANUAL TO BE ABLE TO FIND ANYTHING REMOTELY CLOSE TO WHAT WAS HAPPENING. CAME UP WITH NOTHING. THIS WAS SO FAR THE TRICKIEST THING TO HAPPEN TO ME. I SCHEDULED AN APPOINTMENT TO TAKE THE CAR TO THE DEALERSHIP FOR DIAGNOSIS.
Aug 30, 2020
BACK OVER PREVENTION
3 complaints
The contact owns a 2020 GMC Terrain. The contact stated that upon shifting to reverse(R), the rear-view camera image was blue, and the parking sensor beeping sound was inoperable. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the rear-view camera needed to be replaced. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 71,000.
Nov 26, 2025
The contact owns a 2020 GMC Terrain. The contact stated while reversing, the rearview camera screen displayed a blue image. There was no warning light illuminated. The dealer was notified of the failure and informed the contact that a fee would be charged for a diagnostic test. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline. The failure mileage was approximately 104,000.
Jan 31, 2025
The contact owns a 2020 GMC Terrain. The contact stated while in reverse(R), the back over prevention camera displayed a blue image on the screen. The dealer was notified of the failure but offered no assistance. The manufacturer was also notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The vehicle was not repaired. The failure mileage was approximately 58,000.
Nov 04, 2024
POWER TRAIN,ENGINE,FUEL/PROPULSION SYSTEM
3 complaints
I have been having intermittent problems for well over 1 year with my vehicle not accelerating. I try to accelerate from a stop, the vehicle does not respond. I have the accelerator pedal pressed to the floor nothing happens for 10-15 seconds, then vehicle will lurch forward and start responding. This has happened several times as I am pulling into traffic. Major safety concern that could cause severe injury or fatality. I also have other issues with vehicle not shifting gears, engine feels as though it is skipping while driving. I have taken this to the dealership and was told that they could not recreate the issue. No engine code or service lights have ever displayed. Dealership told me is can't be anything major since there are no codes or service lights. Currently have 72,000 miles, did purchase an extended warranty. I have seen many complaints of this same problem from other Terrain owners. GMC needs to fix this problem before someone is killed in a collision because their product won't accelerate.
Sep 02, 2025
2020 GMC Terrain Engine stopped working. Put in new engine. After one week new engine blown. We were 2000 miles away on vacation. I need a free rental I was with no car for a month and after only one week again for 3 weeks. Compensation request: Lost wages Hospital visit Extra hotel nights Gas Food car and insurance payment
Aug 31, 2023
Turbo failed. Car ran fine with no warning lights. Stopped at red light entering interstate and then could not accelerate which left us stuck in traffic. When it did move it would not shift and took over a mile to get above 20mph in a 65mph zone.
Sep 28, 2022
POWER TRAIN,ENGINE
2 complaints
The intercooler has been a document problem on GMC Terrains for awhile now. I had my intercooler replaced and now less than 10 months it is having the same problem. The vehicle will go into reduced power mode which would be a safety hazard because it will also stall sometimes when it is having performance issues. That could lead to someone colliding into me if it suddenly stops when someone is behind me. I believe this part should be recalled and fixed for free.
Dec 17, 2025
GMC 2029 Terrain Our car broke down three times after a new engine was put in. After one week it had to be towed again to put in a third new engine. It has been fixed since Aug. 1st but GMC has yet to reunite us with the car 2000 miles away. We’ve made car and insurance payments for almost three months with no vehicle in our possession. It was under warranty. No loaner or rental car has been issued to us. Nobody calls us back. Terrible customer service by GMC.
Sep 10, 2023
ENGINE,FUEL/PROPULSION SYSTEM
2 complaints
From a complete stop my car refused to accelerate no matter how much I pushed the gas pedal. I was pulling into traffic and was on a hill so my car rolled forward naturally into the road but would not respond to the gas pedal. The RPMs didn't move, the car had power, I tried putting it in reverse and then back into drive. Nothing worked for a solid 2 minutes at least. Then all of a sudden it registered and worked. I was almost t-boned from a car coming through the curve but luckily, they were able to go around me in time. This put me and my small daughter at risk of being severely injured from a malfunction that I can't recreate to show the technicians. Since this incident, it has happened several times randomly. Sometimes I'm at a red light, or backing out of a parking spot, or pulling out into traffic. When it happens, there are no codes thrown to show any engine malfunctions, but it WILL NOT MOVE! I've noticed more and more the lack of power when driving. Almost as if the transmission is slipping or losing power as well. I bought the car new, only have 38K miles on it, and service it every 5k miles at a GMC dealership. This is going to end up killing someone. The mechanic told me to trade it in, but I just paid it off and it's only 5 years old. There are multiple complaints about this same thing happening with tons of Terrains and there isn't a recall yet.
Oct 23, 2025
The engine cutoff while driving through a major intersection in 3/2022 with no warning lamps, messages or other symptoms of the problem prior to the failure. Dealership replaced the fuel pump module. Subsequently, the engine cutoff while driving in 5/2023. Dealership replaced the fuel pump module. Each of these occurrences placed my life, my passengers life and the lives of others on the road in danger as an accident could have resulted if I was not able to coast out of harms way. GMC has an existing recall on the fuel pump module for 2021 - 2022 Chevrolet Equinox and 2022 GMC Terrain vehicles. Why did this happen a second time after replacing the fuel pump module? Are they using a module included in the recall? I was charged $ 591 dollars for the repair in 3/2022 and no charge in 5/2023 as they stated it must have been a faulty module. I have no confidence in my safety and the module they used in 5/2023 is not faulty.
May 22, 2023
ELECTRICAL SYSTEM,ENGINE,FUEL/PROPULSION SYSTEM
2 complaints
5.25.2025 - Car shut down while at a busy intersection. Called Amherst Police due to location and how dangerous the intersection was. Family member needed to jump start the vehicle. Vehicle started before police arrived. Drove home. Called police to let them know we were no longer at the busy intersection. 5.26.2025 Took out battery to check charge at Auto store - tested Good - 82%. Re-installed battery went to get gas thinking that may be the issue, low on gas, not the case the car wouldn't start at the gas station. Family member needed to jump start the vehicle again. Drove home, called dealer, taking to dealer next week 6.4.2025 due to availability of service. There were no warning lights prior to stalling out both times. This is very dangerous. We are afraid to drive this GMC 2020 Terrain.
May 28, 2025
Purchased Vehicle brand new- Beck & Masten Buick GM - Houston, TX [XXX] Performed rout maint regularly. Last oil change 1-5-2024 before catastrophic failure and complete engine seizure. Towed to Wiesner GMC [XXX] 1-12-2024: Mileage on car roughly 99K- had no issues no check engine light, no mechanical failure or indication that anything was running other than normal. No Start on [XXX] PM after work, tried to return next day with battery , changed out battery, engine still would not start, after new battery installed and we attempted to start, that is when engine started making loud shaking motion while attempting to start, windshield wipers came on randomly. First initial diagnostic: Found all oils & fluids in check, could not identify cause of failure, would have to break down and take apart. Had to authorize the tear down at a 1800.00 cost, 2/2/2024: Broke down engine, found that the crankshaft would move one way , but not other, removed the engine from transmission and now crankshaft moves freely. Now the AC comp is locked up (excessive play on magnet & clutch) , tech still unable to identify what caused the failure, they advised that they found traces of metal in oil pan, scored cylinder walls, starter shorted as well. They still could not indicate where these metal pieces came from, how or that it was due to owner negligence or manuf defects. Again this is a vehicle with 99K Miles and now we were looking at a 15K price tag for a new engine, turbo, AC, starter on a car that is worth 12K. This is absolutely insane. We reached out for Goodwill Discounts for some assistance since the dealership could not solidify a cause of failure, but GM decided to not warranty and stand behind their product. We were left with a rebuild option for 7500.00. which we had to do in order to get the car back. I am completely disappointed in GM as a company. This engine should have never failed at 99K. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Jun 24, 2024
SERVICE BRAKES,FORWARD COLLISION AVOIDANCE
2 complaints
my vacuum pump went out. my brakes went out at 86k miles. very pour design.
Jan 14, 2025
The brake system failed. No warning. When the brakes failed, driver ran the car into a tree to stop instead of hitting pedestrians or other vehicles
Dec 26, 2024
VEHICLE SPEED CONTROL,ENGINE,FUEL/PROPULSION SYSTEM
2 complaints
My vehicle begin stalling when accelerating (mostly after stopping) June 2023. My vehicle has almost cause me to have two accidents because it intermittently stalls when I try to cross an intersection. This is my fourth time taking my vehicle to the GMC dealership, and they tell me they can't find anything wrong if there is not a code. I have reached out to Corp, and I'm waiting to see if they can help get to the bottom of my problem. My car has been sitting at the dealership since June 30th 2023....I call the dealership periodically, and they never reach out to let me know what's going on. I am afraid to drive my vehicle at this time because next time another car may not be able stop and give me time to get across the road. I'm filing this complaint because I seriously think someone is gonna get killed.. Thank you
Aug 13, 2023
As I was driving on the highway in New York on Route 17 south near exit 111, I tried to accelerate but when I did the car went slower and the check engine light and traction control lights came on. I was right in front of a huge truck and thank God I was in the right lane that I was able to quickly get on the shoulder and turn the car off. I was able to make it to where I was going, but it was very nerve wracking. I took the car to the dealer service center and was told that it was probably a fuse issue. It turns out my entire engine has to be rebuilt. I have approximately 25,000 on my car, how could it require an entire engine rebuild? The dealer has gotten me two rentals cars that only last 5 days at a time each time and now I’m driving a dealer loaner. It’s been 3 weeks and still nothing. I’m still making payments on my car.
Feb 03, 2022
ELECTRICAL SYSTEM,UNKNOWN OR OTHER
2 complaints
While driving instrumental panel and infotainment panel completely blacked out for no reason at all. This is the second time in two days this has happened.
Nov 05, 2021
Instrument panel and infotainment system panel completely blacked out while driving vehicle
Nov 04, 2021
ELECTRICAL SYSTEM,UNKNOWN OR OTHER,ENGINE
1 complaint
My a/c went out within 2 years of having the car in 22’. In 2025 i have had nothing but problems, the radio will go out when im driving for about 2 hours and it resets, the screen goes black, music stops, navigation stops and then it turns on like nothing happened. It happens everytime I drive 2+ hours. Back in September of 2025, I was on my way to work when I was stopped at a red light, it turned green and then my brakes locked up and I couldn’t drive my car had shut off, and wouldn’t come back on. I was stuck in the middle of the road not knowing what happened as the car had driven fine up until i stopped at the red light. Then tonight November 21,2025 around 0315 I was leaving work, I started my car, my car threw up a message that said “Low fuel, 0 miles” I had half a tank of gas when I got to work. I turned my car off then back again and it did the same thing. I let my car sit for a second and then my Gas gauge started to slowly increase to the correct amount of gas. Then when I got home (3 mile drive from work) I turned my car off and then back on and this time when I turned the car on my brakes were locked and I couldn’t start my car. All of the Engine lights were on so I turned the car off and then let it sit for a minute before trying to start it. When I tried to start it this time, I couldn’t. It’s like the car had died and was getting no power. I couldn’t lock my car, no lights were working, I couldn’t turn it on or start it. Some time went by and my interior lights were on so then I started the car and it’s almost like my car reset. I can’t see my tires PSI, the clock went to midnight (it was about 0330) it was all just very weird!!
Nov 21, 2025
ELECTRICAL SYSTEM,SERVICE BRAKES
1 complaint
Break assist light comes on and brakes stiffen suddenly with no warning. Happened 6 times now in a 3 year span. Gotten it "fixed" each time but it keeps happening
Oct 24, 2025
Carry Handle, Shell, Base
1 complaint
During a vehicle accident, my 2.5 year old daughter's car seat detached from the base and landed in the back part of my part. We were t-boned on the passenger side back seat. We spun and the car seat detached and she was flung around the car. She had severe whiplash, a contusion and possible fabric burn on her head. She was buckled in properly and the car seat was properly installed. Yes, all parties (other than manufacturer) saw and inspected the car seat.
Jul 22, 2025
FUEL SYSTEM, GASOLINE,ENGINE
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated while driving at an undisclosed speed, the vehicle lost motive power with the check engine warning light illuminated. The vehicle was towed to an independent mechanic, where it was diagnosed that the fuel pump control module had failed and needed to be replaced. The vehicle was not repaired. The dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure and referred the contact to the NHTSA Hotline for assistance. The approximate failure mileage was 88,000. The VIN was not available.
Jun 30, 2025
ELECTRONIC STABILITY CONTROL (ESC),TRACTION CONTROL SYSTEM,ENGINE
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated that the vehicle was taken to a dealer for an oil change. The contact stated that approximately 5 weeks after returning the oil change, while driving at approximately 65 MPH, the vehicle and steering wheel started shaking abnormally and the vehicle lost motive power. The contact stated that the traction control, check engine, and stabili-trak control warning lights were illuminated. The vehicle was taken to a dealer where it was diagnosed that there was no oil in the engine and the spark plugs and ignition coils needed to be replaced. The vehicle was repaired; however, the failure reoccurred three weeks later. The manufacturer was not notified of the failure. The failure mileage was approximately 37,000.
Jun 26, 2025
POWER TRAIN,VEHICLE SPEED CONTROL,ENGINE
1 complaint
On 6/22/2025, brakes stopped working while trying to make a turn. Next multiple engines light came and car went into reduced speed mode. As I tried to find a safe place to stop, the vehicle went into limp mode and shut down in the middle of the road. The dealership said the issue was the vacuum pump which caused the timing chains to break. There have multiple recalls for this exact issue but my car is not on the list. My manufacture warranty ended on 5/21/2025. When I spoke to a GM representative I was told there was nothing they can do because there is not a recall for my vehicle. They explained even though I had the same problem the recall is for other vehicles. GM also issued a warranty extention on the vacuum pump to 10 years 150,000 miles. However my vehicle is not on the list for the extention. this issue is a safety hazard regardless of the vehicle type. I was lucky that no one was behind me or they would have hit me.
Jun 26, 2025
UNKNOWN OR OTHER,BACK OVER PREVENTION
1 complaint
My backup camera in my 2020 vehicle has failed twice. Once was covered under manufacturer's warranty, and it then failed again 14 months later, which is not covered under warranty. As explained by the dealer, a parts warranty is 12 months if covered under manufacturer warranty and 24 months if paid for by the owner. Different warranties for the same part? Additionally, there is a service bulletin out about this issue as MANY other owners are reporting the same issue. The camera parts are being damaged by "water intrusion". There is NO rust or damage that would be contributing to this, thus it appears to be a manufacturing defect. There is no way I should have had to replace this part twice with only 40,000 miles on the vehicle. (first time at 24,000 miles, second time at 38,500 miles). I feel that the manufacturer should be fixing these as they know it is a widespread problem.
May 02, 2025
ENGINE AND ENGINE COOLING
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated while driving 45 MPH, the vehicle inadvertently lost motive power. The contact was able to pull over to the shoulder of the roadway, where the vehicle failed to restart. The check engine warning light was illuminated. The vehicle was towed to the dealer, who determined that the engine had seized. The contact was informed that the engine needed to be replaced. The vehicle was repaired, but the failure reoccurred. The vehicle was again towed to the dealer, who again diagnosed a failure with the engine. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); but the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was unknown.
May 02, 2025
SERVICE BRAKES, HYDRAULIC,ENGINE
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated that the vehicle failed to stop while driving 55 MPH while depressing the brake pedal. The contact pressed the button that immediately shifted the transmission to park, and the vehicle came to a stop. The contact drove the vehicle to a safe parking space. After safely parking the vehicle off-road, the check engine and brake assist warning lights illuminated. The vehicle was towed to the dealer who diagnosed that the brake booster pump and camshaft had fractured and detached from the vehicle. The contact was informed that the brake booster, vacuum pump, and camshaft needed to be replaced. The vehicle was not repaired because the dealer was awaiting the parts to repair the vehicle. The manufacturer was not informed of the failure. The failure mileage was 101,700.
Mar 10, 2025
VISIBILITY
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated that after starting the vehicle and shifting into reverse(R); the rear-view camera screen was not functioning as needed. There was no warning light illuminated. The message "Service Rear Camera System" was displayed. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 53,500.
Feb 25, 2025
VISIBILITY,STRUCTURE
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated that rain water had leaked from the sunroof drainage into the vehicle causing the floor carpets to become saturated with water and mold had developed inside the vehicle. The contact also discovered a pool of water inside the spare tire well. The vehicle was taken to the local dealer who replaced the sunroof motor and sunroof liner, unclogged the sunroof drainage assembly and replaced the carpets. The contact indicated that later the failure had reoccurred although the sunroof drainage assembly was consistently unclogged each time the vehicle was in for service. The contact had also experienced respiratory illness due to the mold present inside the vehicle. The manufacturer was notified of the failure but no assistance was offered. The failure mileage was 12,300.
Dec 19, 2024
ELECTRICAL SYSTEM,SERVICE BRAKES,FORWARD COLLISION AVOIDANCE
1 complaint
My Terrain has a light that has been coming on for a couple months. Service Brake Assist. I took it to the dealer after my brakes locked up and about $800 after getting it fixed the light continues to come on. The forward collision light comes on every time I start the car. More the check engine light came on and says engine electrical system. What the heck is going on? I love this car and take very good care of it but I feel like the $800 that I just spent was a waste. I fear that I will get in a wreck like when the brakes totally locked up and I couldn't press on them.
Nov 30, 2024
POWER TRAIN,SERVICE BRAKES,ENGINE
1 complaint
While driving I had to push the brake to the floor and a light came on saying reduced engine power. I pulled over right away and had my car towed to mechanic. The vacuum brake pump exposed and parts went into the engine. The mechanic got all the parts out but now engine has low compression and needs a new timing chain. This is over $3,000 so far. Gm recalled other vehicles with the exact same pump ? Why not the terrain.
Aug 22, 2024
ENGINE AND ENGINE COOLING,POWER TRAIN,SERVICE BRAKES
1 complaint
The contact owns a 2020 GMC Terrain. The contact stated that while driving 50 MPH, the vehicle lost braking power. The driver was able to pull over safely. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was diagnosed that the vacuum pump had shattered. The vehicle was repaired, but the failure recurred. The contact reached out to a GMC engineer, who informed the contact that the failure was due to the camshaft reluctor. While driving, the vehicle lost engine power. The vehicle was towed to the same local dealer, where it was diagnosed that the throttle body needed to be replaced. The vehicle was repaired, but the failure recurred. The vehicle was towed to the local dealer, where it was diagnosed that the turbo code had a mass air flow sensor failure. The vehicle was repaired. While driving at an undisclosed speed, the check engine warning light illuminated, and the reduced engine power message was displayed. There was blue smoke detected from the exhaust. The vehicle was towed to an independent mechanic, who informed the contact that the throttle had failed. The vehicle was towed to another local dealer, Power GMC Chevrolet of Newport (1422 N Coast Hwy, Newport, OR 97365) where it was diagnosed that the air pipe charge and air cooler needed to be replaced. The vehicle was repaired. The manufacturer was contacted and referred the contact to the local dealer. The failure mileage was approximately 50,000.
May 01, 2024
VEHICLE SPEED CONTROL,UNKNOWN OR OTHER,ENGINE
1 complaint
On 4/10/2023, I took my vehicle to a local GMC dealership because it was stalling and didn't have any power. Upon accelerating the vehicle it would stall and take off at a high speed. The dealership has had my vehicle periodically from April 2023 and it presently sets at the dealership because they ain't getting a code, But after the dealership drove the truck for over 200 miles, they were finally able to duplicate the stalling yet are not able to diagnose the problem!! This vehicle is very dangerous to be on the road and I have almost gotten hit twice and I'm not driving the vehicle anymore at this time. I have previously reached out to you all and I would be most thankful if you could get in touch with me. Thank you
Oct 14, 2023
POWER TRAIN,ELECTRICAL SYSTEM,STRUCTURE
1 complaint
After heavy rain the backseat of the car was flooded as well as the rear wheel well likely due to the sunroof not draining properly. This led to electrical failure of the sunroof mechanism and potential to damage other electrical elements. This will be looked at by the dealership but have read that this is a known issue.
Aug 29, 2023
VEHICLE SPEED CONTROL,SERVICE BRAKES,ENGINE
1 complaint
While on highway service brake system warning light came on,brake became hard to apply almost causing an accident. Vehicle had to be towed to a repair shop(dealer).after paying over $1600 the problem was not resolved and found there are numerous complaints about issues with the terrain and no recall issued.are they waiting til someone dies before a recall?
Aug 18, 2023
UNKNOWN OR OTHER,ENGINE,FUEL/PROPULSION SYSTEM
1 complaint
My 2020 terrain is now at 33k+ miles, I have had repeated instances with my car not accelerating properly. I would be at a full stop try to start to accelerate and not move push down a little further on accelerator and start crawling forward. I would move approximately quarter mile before the vehicle would jerk and accelerate very quickly to a speed well over where it should go to. I.e. I know because I’m starting in traffic I’m not trying to take off at thirty but when the jerk happens I can be jolted to 40-45 mph. The other issue is people behind you don’t realize what’s going on and I have been hit almost twice thankfully they were able to avoid me by going around. No warning lights have come on. This last insistence not only could I not accelerate, but cruise did not want to turn on, the emergency brake didn’t want to work, and the air conditioner was loosing power. I plan on having an independent service center inspect the vehicle, my husband was able to repeat the issue so I’m sure they will also. The first incident was in May and I have had 5 but thankfully I don’t drive that much.
Jul 17, 2023
ENGINE,FORWARD COLLISION AVOIDANCE
1 complaint
This GMC I just purchased in October 22 2022 and have been complaining since December 9,2022 the vehicle emergency braking will activate when I'm driving down the interstate or local roads I could be doing 70 and brakes will just lock up throwing me and my son forward , this has happened 4x , Gas Pedal when taking off at red light or pulling out the vehicle is hesitant and will not go this has happened on 3 different occasions. I called roadside on star they said there is a problem with the on star saftey feature will not work properly this was towed 2x to different shops, Also while driving this vehicle it will just ingage itself in park while driving called on star they did diagnostic there was all kinds of Coded for Transmission and Engine as well as Emissions this vehicle is a safety hazard.. And I have tried to take back to dealership where I purchased they keep making excuses to not see this CPO with lifetime Warranty and still under warranty from GMC vechle Mileage was at 29k when problems stared vehicle only has 31k I can't drive this vehicle due to my son's and myself along with others saftey this is ridiculous and also GMC just informed me the Vin # they have for my vehicle and whats on it are two different numbers! Yet nothing is being done I'm paying for a vehicle that I can't drive I have proof GMC knows about the fraud from dealership but GMC says its a sales thing This vehicle has been flooded two mechanics have confirmed and GMC is aware so why not do something I don't know exactly the history and GMC doesn't either please someone contact me GMC this is crazy and you know it's a safety issue with this 2020 GMC Terrain you even said so
May 27, 2023
STEERING,SERVICE BRAKES,FUEL/PROPULSION SYSTEM
1 complaint
Service brake assists light flashes on dashboard . Steering wheel locks up and jerk’s loose suddenly when making a right turn, in these moments when the steering wheel jerks loose ;hands are off taken off the steering wheel otherwise injury can occur. Battery life 2 -yrs old is not performing optimally. Can not hold a sufficient charge and ESC light flashes. Vdnt valve leaks discovered.
Feb 07, 2023
FORWARD COLLISION AVOIDANCE
1 complaint
The emergency breaking system failed to engage. Failure to engage caused collision with another car
Jan 15, 2023
FORWARD COLLISION AVOIDANCE,LANE DEPARTURE,BACK OVER PREVENTION
1 complaint
None of these features have ever worked
Jan 15, 2023
SEAT BELTS
1 complaint
Driver seat belt exhibits signs of fraying in area of belt hidden from view when not in use. When extended, hair-like fibers extend out, primarily from the car-forward side of the belt in the area coming out of the B-pillar and from behind the trim. It is available for inspection. Concerned that this may continue to degrade the integrity of the seat belt over time. There could be something sharp in the retractor, or flash on a piece of plastic trim hidden from view causing this. My understanding is that if there is a small nick on the edge of a safety belt it can tear across, and concerned that this condition could lead to a similar outcome over time and if the vehicle were involved in an accident. Upon taking to local dealership, was advised that this is a normal condition and not a concern. Advisor said technician told him that it is not fraying, it is a normal condition that can be exhibited by the belt fibers, especially towards the edges. They said the central portion of the belt is not exhibiting a similar condition and therefore not a concern. The fibers seem to have grown in quantity since vehicle purchase. I first recall seeing them during the pandemic, although became more concerned over time and finally took in prior to warranty expiration for review.
Jan 12, 2023
UNKNOWN OR OTHER,SERVICE BRAKES
1 complaint
My service brake assist light came on and then within seconds my vehicle then said engine power has been lowered and my vehicle pretty much shut down no steering no brakes couldn't do anything. Took it into the repair shop and my vacuum pump has shattered and now damaged my camshaft. I am aware there's been many other vehicles recalled with GM's vacuum pumps and I'm not sure why my year and model has not been included when it's doing the same thing and not to mention I have seen countless other cases of people saying same things happen to them with their GMC terrains.
Dec 31, 2022
UNKNOWN OR OTHER,VISIBILITY/WIPER
1 complaint
VEHICLE HAS 56801 MILES AND AIR CONDITIONING COMPLETELY WENT OUT. i HAVE ALSO REPLACED WINDSHIELD WIPERS TWICE IN 6 MONTHS. THIS IS MORE THAN ANY OTHER VEHICLE i HAVE EVER OWNED (i HAVE HAD THE VEHICLE 1 YEAR NOW)
Jun 13, 2022
ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL,UNKNOWN OR OTHER
1 complaint
Dash had gone black intermittently, did not know what speed I was going. OnStar called oor phone multiple to notify us that our airbags we're offline for ten days no warning light on dash until one to two days later . Took to service was informed that gear shift control, engine control module, passenger presence module and airbag sensor needed replaced. All within a month of purchase of said USED vehicle. Vixed under warranty. Then another monther later, got warning on dash saying "conditions not current for shifting", park break light came on, and a p in a yellow circle with a wrench under it came on. Serive did fix vehicle, but could not verify message on dash about conditions not favorable... Also recalibrated breaker. Complained numerous times to dealer about these issues and was told "live with it".
Apr 08, 2022
SERVICE BRAKES,ENGINE,LANE DEPARTURE
1 complaint
UNKNOWN...ACTS AS IF ITS A SMART CAR THAT'S NOT REALLY A SMART CAR
Mar 28, 2022
POWER TRAIN,AIR BAGS,SERVICE BRAKES
1 complaint
Brakes hard to press. Almost cause an accident on interstate. Was able to contain vehicle. Took to autozone to assessed and it said Powertrain System. Brake Booster Senor Circuit.
Feb 18, 2022
EXTERIOR LIGHTING
1 complaint
Interior lights stays on at night while driving and when parked. Tried turning it off but it won’t turn off
Jan 25, 2022
ELECTRICAL SYSTEM,ENGINE
1 complaint
This 2020 GMC Terrain has a "feature" called autostop. This is not a switch to turn this off. It would not be so bad if the engine would run for 5 minutes at a stoplight before stopping the engine but it immediately shuts down the engine after a stop. This is getting annoying and dangerous due to the delay in getting the car moving. I have only had the car for a month. I understand that later gmc cars have a disable switch. This car should be recalled and either disable the auto stop permanently or be able to disable the "feature" on demand. Problem: potential crash hazard due to car not starting and damage to battery and starter.
Dec 31, 2021
VEHICLE SPEED CONTROL,FORWARD COLLISION AVOIDANCE
1 complaint
Not long after I bought my 2020 GMC Terrain my adaptive cruise started disengaging. There are never any warning lights, except the noise and vibration of the seat before it shuts off then tells you it's disengaging. I didn't think anything of it until it's became a regular occurrence in the last month or two. I tell my dealership about it and they drive it but it never disengages on them, so they say nothing is wrong with my vehicle. I have a picture of the "adaptive cruise disengaging" and video of where I can't reset it until after about 15 or so minutes or letting my car set for a while or turning off the engine then it works again. I also have noticed that my auto start/stop hasn't been turning on & off anymore.
Sep 08, 2021
FORWARD COLLISION AVOIDANCE,ELECTRICAL SYSTEM
1 complaint
On fairly level ground, reduce speed hill descent control msg has activated (12 mile and maxwell area 2x, Rochester Hills Kohls parking lot exit) and once entering river bend dr. vehicle has also has had activated brakes on oak hill street in rochester. the vehicle has less than 4100 miles. very concerning about activated brakes.
Jun 25, 2021
VISIBILITY/WIPER
1 complaint
I AM A MALE OF 6'1" HEIGHT AND FIND IT VERY HARD TO SEE OUT THE REARVIEW MIRROR WHEN I DRIVE MY WIFE'S GMC TERRAIN. BECAUSE OF THE LIMITED MOBILITY OF THE MIRROR, I AM UNABLE TO SEE OTHER CARS BEHIND MY VEHICLE WITHOUT LOWERING MY HEAD AND RECLINING MY SEAT BACKWARDS, BOTH OF WHICH CAN BE VERY DANGEROUS TO DO WHILE DRIVING. I WOULD LIKE TO SEE THE MIRROR ADJUSTED TO BE LONGER, OR ABLE TO BE ADJUSTED FURTHER UPWARD TO IMPROVE VISIBILITY FOR TALLER PEOPLE, LIKE MYSELF.
Mar 17, 2021
STEERING,SUSPENSION,POWER TRAIN
1 complaint
THIS VEHICLE IS UNSAFE DUE TO A VIOLENT SIDE TO SIDE WOBBLE IN THE FRONT END MUCH LIKE THE JEEP DEATH WOBBLE. THIS HAPPENS CONSTANTLY ANYWHERE FROM 30MPH - 70MPH USUALLY AFTER HITTING A SMALL BUMP OR WHEN TURNING HARD. THE TURNING ASPECT IS WHERE IT HAS BECOME VERY DANGEROUS ON SLIPPERY SURFACES AS THE CAR THEN SLIDES OUT. I LIVE IN THE MOUNTAINS WHERE THIS IS A NORMAL OCCURANCE. I AM ACTUALLY AFRAID TO DRIVE THIS VEHICLE ANY LONGER. THE DEALERS HAVE CONFIRMED THE ISSUE, BUT STATES THAT GM DOES NOT HAVE A FIX FOR THIS AS OF NOW. I HAVE HEARD THIS IS AFFECTING ONLY THE AWD TERRAINS AND EQUINOX PLATFORMS. GM HAS BEEN UNRESPONSIVE TRYING TO GET AN ANSWER OR GETTING THIS FIXED. THE CAR HAS BEEN INTO MULTIPLE DEALERSHIPS SEVERAL TIMES FOR THIS SAME ISSUE AND HAS BEEN HAPPENING SINCE THE CAR TURNED ABOUT 2400 MILES AND HAS BEEN HAPPENING MORE FREQUENTLY SINCE THEN FOR THE PAST 6000 MILES.
Feb 16, 2021
AIR BAGS
1 complaint
MY AIR BAG WARNING LIGHT/DASHBOARD MESSAGE HAS COME ON 7 TIMES IN THE LAST 3 WEEKS, ALONG WITH 4 OTHER TIMES IN THE 2 MONTHS PRIOR, BUT THE GMC DEALERSHIP WILL NOT INVESTIGATE SINCE IT DOES NOT STAY ON. AT THE MOST RECENT EVENT THIS WEEKEND, I PRESSED ONSTAR, AND THEY RAN DIAGNOSTICS AND EMAILED ME THE "B0085" DETECTED ERROR CODE, BUT MY DEALERSHIP WILL STILL NOT INVESTIGATE, SINCE THE LIGHT WENT OUT. THE LIGHT HAS COME ON AT STARTUP AND WHILE DRIVING. WARNINGS HAVE COME ON 8/27/20, 10/5, 10/8, 10/12, 111/28, 12/2, 12/8(X2), 12/11, 12/14, AND 12/19/20.
Dec 21, 2020
POWER TRAIN,WHEELS
1 complaint
ONLY A MONTH AFTER PURCHASING MY VEHICLE I STARTED TO FEEL A WOBBLE IN THE FRONT END WHEN ACCELERATING UP HILLS AND TURNING WHILE ON THE GAS. I TOOK IT TO THE DEALER AND THEY CHANGED OUT THE FRONT TIRES STATING THAT THE PROBLEM HAD BEEN FIXED. ONCE AGAIN WHILE DRIVING THE PROBLEM PERSISTED. I TOOK THE CAR BACK TO THE DEALER AGAIN AND THEY SAID THAT THEY COULD NOT FIND ANYTHING WRONG AND SUGGESTED THAT I MAKE AN APPOINTMENT TO GO FOR A DRIVE WITH THE MECHANIC TO SHOW THEM WHAT IS HAPPENING. I MADE AN APPOINTMENT. A DAY BEFORE THE APPOINTMENT I RECEIVED A CALL FROM THE DEALERSHIP STATING THAT AN EMPLOYEE RECENTLY PURCHASED THE SAME CAR AND THEY ARE HAVING SIMILAR DIFFICULTIES. THEY FOUND ONLINE THAT GMC WAS REQUESTING INFORMATION FROM DEALERS ABOUT THE PROBLEM AND WAS TOLD THAT I NOW NEED TO WAIT FOR GMC TO COME UP WITH A SOLUTION. MY CAR SHAKES EVERY TIME THAT I DRIVE IT, IT'S AWFUL, AND IT ONLY HAS AROUND 6,000 MILES ON IT. I'M NOT SURE WHAT TO DO BECAUSE THE DEALERSHIP TOLD ME THAT I HAVE TO WAIT FOR A SOLUTION. THEY ARE NOT EVEN TRYING TO FIX ANYTHING AT THIS TIME. PLEASE HELP.
Nov 17, 2020
VEHICLE SPEED CONTROL,UNKNOWN OR OTHER
1 complaint
PURCHASED NEW 2020 GMC TERRAIN W/7MILES. LEFT DEALERSHIP ON MY WAY HOME, AND WITHIN 20 MILES, RECEIVED A MESSAGE ON DASH-> SERVICE - ESC - DISMISS. CHECK ENGINE LIGHT FLASHED SEVERAL TIMES, AND THE SUV SLOWED DOWN AT LEAST 10 MILES FROM 65MILES PER HOUR. AFTER ENGINE LIGHT STOPPED BLINKING, I CONTINUES HOME AROUND 30 MILES MORE WITH NO MORE PROBLEMS. CALLED MY SALES PERSON THE NEXT DAY, AND HE DID NOT KNOW WHAT ESC WAS. (ELECTRONIC STABILITY CONTROL) HE CALLED ME BACK AND INDICTED THE VEHICLE MAY NEED A SOFTWARE UPDATE. I TOLD MY WIFE, WHY WOULD A DEALERSHIP NOT CHECK ON VEHICLE SOFTWARE UPDATES BEFORE RELEASING VEHICLES TO THE NEW OWNERS, PRIOR TO LEAVING THE DEALERSHIP. THIS IS CALLED, "BEING PROACTIVE." WE WERE ON THE HIGHWAY LEAVING THE DEALERSHIP AFTER PURCHASING THIS NEW SUV.
Nov 09, 2020
WHEELS,SERVICE BRAKES
1 complaint
WHEN REVERSING OUT OF A PARKING SPOT, BRAKES FAILED CAUSING ACCIDENT. MULTIPLE ATTEMPTS TO DEPRESS BRAKE PEDAL WITH NO BRAKING. HIT A PARKED CAR. AFTER SHUTTING CAR OFF AND ATTEMPTING TO MOVE VEHICLE BRAKES DID ENGAGE AND RESPOND CORRECTLY. REAR DAMAGE TO TERRAIN OCCURRED REQUIRING TOWING.
Sep 19, 2020
VEHICLE SPEED CONTROL,ELECTRONIC STABILITY CONTROL (ESC),SERVICE BRAKES
1 complaint
EVERY WEEK IT'S SOMETHING DIFFERENT. IN MOTION... NO CRUZE CONTROL. NO AUDIO. DON'T DRIVE OVER 50MPH BRAKE PROBLEM. PARKING BRAKE ENGAGES RANDOMLY AND WITHOUT USER ENGAGEMENT. NO AWD. NO STABILITY TRACTION. THIS HAPPENS SO FREQUENTLY THE DASH INDICATORS HAVE BEEN REDUCED TO 'IDIOT LIGHTS'. AT WHAT POINT DO I BECOME CONCERNED? THINGS APPEAR TO RESOLVE WHEN THE ENGINE IS TURNED OFF AND BACK ON, SOMETIMES....I COMPARE IT TO OTHER GLITCHY TECHNOLOGY. HOWEVER I POTENTIALLY COULD BE AT AN 80MPH CRAZING SPEED WHEN I DECIDE TO IGNORE THE IDIOT LIGHTS...WHAT HAPPENS WHEN A REAL PROBLEM PRESENTS AND I IGNORE THE DASH INDICATORS DO TO FREQUENT GLITCHES? I'M SO DISAPPOINTED. MY 2 PREVIOUS TERRAINS WERE 10 TIMES THE VEHICLE THE 2020 MODEL YEAR.
Jul 28, 2020
SUSPENSION,STRUCTURE,UNKNOWN OR OTHER
1 complaint
THE COMPLAINT I HAVE IS THE INSIDE FRONT OF THE CAR IS TOO SMALL AND I CANT REACH THE GAS PEDAL EXCEPT WITH MY TOE. MY FOOT KEEPS SLIPPING OFF AS I AM DRIVING. I HAVE TO HAVE THE SEAT WAY UP OR I CANT REACH. I AM 5 FOOT TALL WOMAN. THIS IS A RIDICULOUS THING THAT I HAVE TO PUT UP. I DROVE IT FOR 10 MINUTES AND DIDN'T REALIZE IT. I ASKED FOR A PEDAL THAT IS LONGER AND CLOSER TO THE FLOOR AFTER I HAD BOUGHT IT AND SERVICE PEOPLE TOLD ME THEY DON'T HAVE ANYTHING TO DO TO FIX IT. THEY ASKED IF I HAD A BUTTON TO ADJUST IT AND I DON'T. ITS ON THE EXPENSIVE ONE. THIS SHOULD BE ON ALL VEHICLES FOR SAFETY. I WANTED TO GIVE IT BACK BUT THEY NEVER HELPED ME. I HAVE 1100 MILES ON IT .IT NEW STILL. THE OTHER THING THIS CREATES IS I AM UP SO CLOSE TO THE STEERING WHEEL THAT ITS ALMOST ON MY CHEST IN ORDER TO REACH PEDAL WITHOUT HAVING TO STRAIN AND LATER HAVING PAIN IN MY LEG FROM DOING THAT. I AM SO DISAPPOINTED WITH CHUCK NASH GMC IN SAN MARCOS , TEXAS. IS THERE ANYTHING TO BE DONE BY THE GMC COMPANY. I ALSO TOLD THE SALESMAN I WANTED A CANYON PICKUP LIKE I HAD BEFORE. I TRADED THAT ONE IN DUE TO THE FACT THAT THE 2017 CANYON WAS ALWAYS IN THE SHOP. ONLY HAD IT FOR 2 YRS AND 1 MONTH. THEY WERE NO HELP! THANK YOU, [XXX] PLEASE HELP ME INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR
Mar 05, 2020
VEHICLE SPEED CONTROL
1 complaint
WHEN CRUISE CONTROL IS ENGAGED AT 71MPH, HOLDING +RES BUTTON TO INCREASE SPEED AND RELEASING IT AT 77MPH SETS CRUISE SPEED TOO HIGH. CAR CONTINUES TO ACCELERATE. CRUISE GETS SET AT 100MPH AND ACCELERATES MORE THEN DESIRED. SEE LINK WITH VIDEO OF EVENT HTTPS://PHOTOS.APP.GOO.GL/O7ZGEQWCSU7KYCV58 SEE ATTACHED PICTURE OF OWNERS MANUAL
Nov 02, 2019
Frequently Asked Questions
How many problems does the 2020 GMC Terrain have?
The 2020 GMC Terrain currently has 157 owner-reported complaints according to NHTSA database. These complaints are organized by component to help identify common issues.
What are the most common problems with 2020 GMC Terrain?
The most common problems reported for the 2020 GMC Terrain are organized by component above. Each component section shows owner-reported issues, crash reports, and fire incidents to help identify patterns and problem areas.
Where does this 2020 GMC Terrain problem data come from?
All problem and complaint data for the 2020 GMC Terrain comes directly from the National Highway Traffic Safety Administration (NHTSA) database. These are real complaints submitted by actual vehicle owners.
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