Owners have filed 48 complaints on the Kia K4, covering 2025–2026. The system named most often is Electrical System (10 reports). Worst years by volume: 2025, 2026; cleanest: 2026, 2025. 11 reports describe a crash. On average the car was 0.4 years old when the problem happened.
What breaks on Kia K4
Grouped by the system owners named — percentages are shares of all 48 K4 complaints. Open any row for the full reports in owners' own words.
Electrical System 10 Read
Blind spot and front collision features inactive. Seat belt didn't unlock after crash. Airbags deployed no passenger didn't work on driver airbag b1652 dtc codes on recall for another vehicle
Transmission failure 4 times since purchasing it new in December 2024 I was almost killed multiple times on the highway because car won’t accelerate. Car is jumping when driving and choking Air conditioning shuts off while driving Car gets stuck in park and nothing will work
The car completely cut off while driving on the highway going 65 mph. This isn’t the first time it has turned off while driving. I had to pull over and put the car in park before it would turn back on. The error says Accessory Mode. I have taken the vehicle to Kia Dealership in Winston Salem but they told me they are…
Steering 6 Read
Sometimes when I’m driving the steering wheel just jerks to the left sometimes causing me to swerve into incoming traffic. It’s very scary. Luckily I’m holding tight to the steering wheel to keep myself from hitting someone
Steering Instability: The steering wheel would periodically veer to the right and left on its own without my input. This created an unsafe driving condition and required constant correction to maintain control of the vehicle. Blind Spot / Reverse Detection Malfunction: When shifting the vehicle into reverse, the…
While driving my 2025 Kia K4, the steering system failed and became unresponsive. I was unable to steer the vehicle as intended. The exact cause of the steering failure is UNKNOWN at this time. The vehicle and steering components are available for inspection upon request. The loss of steering control put my safety and…
Power Train 6 Read
To whom this may concern, I was using my cruise control on my way to work. I usually set it to 80 because police are okay with that speed on I-75. I braked before my automatic brakes hit after I got cut off. I pressed resume in the cruise control and it accelerated pretty quick. I’ve experienced that quite a bit, but…
Transmission slippage, rpms rev higher then mph, hesitates at red lights and stop signs
Bought my Kia k4 2025 in February at DTLA Kia and the experience has been [XXX]. The first day driving I went up near dodgers stadium , immediately had a burnt smell. I disregarded it thinking maybe its fresh paint burning , WRONG. Till this day 4 months later my tail pipe throws a musty smell. Issue number 2 , the…
Air Bags 4 Read
Vehicle's forward collision warnings did not sound. Airbags did not deploy. Vehicle in front end collision at 40mph
I was hit on the driver side of the car infront of the driver door side of the hood and it took out my wheel and the car is totaled with how hard the hit was made my car bounce but the air bags never deployed and the fireman and the police officer said with as hard as I was hit it should have deployed
The airbags failed to go off. I think the vehicle is still available it was towed to Carroll's in Winslow Maine. By the airbags not going off it made the risk of injury much greater. Also lost control of the steering all together. Tried to swerve to miss an animal and the steering assist took over. Yes we have a…
Vehicle Speed Control 3 Read
Transmission stopped working when the vehicle was used under 200 miles
There are times my vehicle keeps accelerating even though I’m hitting the brakes. Once stopped, it then doesn’t want to accelerate. I’ve reported to the dealership and they try to tell me it’s the type of transmission it has and that it’s normal. Continuing to accelerate while braking is extremely unsafe. My engine is…
This same incident had happened 6 times prior to my being able to take a picture of my dashboard. The cruise control changes on its own to 90 or 110 mph and the acceleration begins on its own very aggresively. It has nothing to do with the speed limit as you will see on the picture, the speed limit is 65 and I had…
Back Over Prevention 2 Read
The insurance claim agent called on behalf of their insured driver, who rented a 2025 Kia K4. The contact stated that while their insured driver was attempting to reverse, the reverse sensor became inoperable with no warning lights illuminated. The contact stated that the reverse sensor failed to function properly.…
The 2025 Kia K4 sensors failed to go off resulting in the rear bumper to hit a barrell. The operator of the Kia K4 was reversing at 1mph
Engine And Engine Cooling 2 Read
The contact owns a 2025 Kia K4. The contact stated while driving at 40 MPH on several occasions, the vehicle stalled. The vehicle was able to restart but would immediately stall again, requiring the driver to wait approximately 10 minutes before the vehicle could be successfully restarted and driven. The vehicle was…
The contact owns a 2025 Kia K4. The contact stated that while driving at 75 MPH, the vehicle downshifted upon depression of the accelerator pedal, with heavy white smoke coming out of the exhaust pipe. The contact stated that the low oil pressure warning light was illuminated prior to the failure. The contact pulled…
Service Brakes 2 Read
I am reporting a serious safety defect involving the brake pedal area of my newly leased Kia K4 GT-Line. There is a metal bracket/component located directly above the brake pedal that interferes with foot placement. My foot becomes caught on this bracket when attempting to apply the brake, which delays or prevents…
When parked and cutting the car on check driver assistance system come on, check and, and esc comes on. The parking brake does not go off and malfunction. When trying to move the car sometimes it still drives and sometimes the parking brake will not allow you to move until the system resets its self. There are 6 codes…
K4 years to avoid — and the clean ones
Complaints per model year. More reports usually means more cars on the road as well as more trouble, so read the crash and fire columns alongside the count.
| Model year | Complaints | Top system | Crashes | Fires |
|---|---|---|---|---|
| 2026 | Forward Collision Avoidance | 3 | — | |
| 2025 | Air Bags | 8 | — |
The same model year, different builds
Every complaint carries the first 11 characters of the VIN — plant, year, body and engine. That is a production series, and complaints are spread across them very unevenly.
| Measure | Value |
|---|---|
| Distinct production series | 29 |
| Average complaints per series | 1.7 |
| Worst single series | 6 complaints |
| Average age at failure | 0.4 years |
A model average of 1.7 hides a worst series at 6. Enter a VIN above to see the numbers for that exact build instead of the model as a whole.
Owners reported these. Find out if yours is one of them.
- Complaints matched to the exact production run, not just the model
- What the car is worth given what tends to fail on it
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How we count
Every figure here comes from complaints owners filed with NHTSA — 1,100,006 of them, covering 1,982 models built between 1981 and 2026.
A complaint is an unverified report: someone wrote down what happened to their car. It is not a confirmed defect and not a recall. What makes the volume useful is the pattern — when thousands of owners of the same build describe the same failure, that is a signal no marketing brochure will give you.
Two things we do that the source does not. First, we compute the age of the car at the moment of failure from the incident date and the model year. Second, we group complaints by the first 11 characters of the VIN — the production series — so a bad plant run does not disappear into a model-wide average.
Frequently asked questions
What are the worst years for the K4?
By complaint volume, 2025, 2026 drew the most owner reports. Bear in mind that popular years put more cars on the road, so check the crash and fire columns too.
Which K4 years are the cleanest?
2026, 2025 have the fewest complaints on file. For recent years that can simply mean the cars are young.
How many complaints does the Kia K4 have?
48 owner complaints filed with NHTSA, covering 2025–2026. Of those, 11 describe a crash and 0 a fire.
Are these complaints verified?
No. They are unverified reports from owners. NHTSA publishes them as filed and investigates only a fraction. The value is in the pattern, not in any single report.
Can I check complaints for one specific car?
Yes — enter its VIN above. We match the first 11 characters, which identify the plant, year, body and engine, so you get complaints on that exact production series rather than the whole model.