Half of all complaints arrive by 7 years of age, so 100% land after the 3-year basic warranty ends. The system owners report most is Service Brakes, with 2 complaints, typically at 9.5 years.
Chevrolet GMT-400 years to avoid — and the best ones
| Model year | Per run | Complaints | Runs | Enough history? |
|---|---|---|---|---|
| 1999 | 3 | 3 | yes |
When it starts to break
| Age at failure | Complaints | Running total | Warranty |
|---|---|---|---|
| 3 years | 33.3% | you pay | |
| 7 years | 66.7% | you pay | |
| 12 years | 100% | you pay |
Basic warranty on this car is 3 years / 36,000 miles. Only 0% of reported failures happen inside it — the remaining 100% come out of the owner's pocket. Powertrain cover (5 years / 60,000 miles) reaches further, but it only covers the engine and transmission, which account for few of the complaints here.
What actually fails — and at what age
On the Chevrolet GMT-400, the early trouble is Fuel System and Gasoline — reported at around 3 years, so a car still under warranty is the one to check for it. What waits further out is Service Brakes at 9.5 years — past every basic warranty, and the bill lands on whoever owns the car then.
| System | Complaints | Typical age | Crash | Fire |
|---|---|---|---|---|
| Service Brakes | 9.5 yrs | — | — | |
| Hydraulic | 9.5 yrs | — | — | |
| Fuel System | 3 yrs | — | — | |
| Gasoline | 3 yrs | — | — |
Good year or bad year — the VIN settles it.
- Check any VIN against complaints for its exact build year and plant
- Exact value for that car, adjusted for its mileage
- Full research report as a PDF you can hand to a mechanic
- Alerts if a recall lands on a car in your garage
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Frequently asked questions
Is the Chevrolet GMT-400 reliable?
By complaints per production run it is better than typical: 1 against 3.73 for the average car.
When do GMT-400 problems usually start?
Half of all complaints arrive by 7 years of age. The most reported system is Service Brakes, typically at 9.5 years, followed by Hydraulic.
Will the warranty cover GMT-400 problems?
Mostly not: basic cover is 3 years / 36,000 miles, and only 0% of reported failures fall inside it.
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