2020 GMC Terrain problems and complaints
Owners have filed 195 complaints with NHTSA about the 2020 GMC Terrain. The most-reported areas: Service Brakes (70), Engine (57), Unknown Or Other (34).
Key takeaways
- 195 owner complaints on file with NHTSA.
- 7 involve a crash, 2 a fire, 5 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Service Brakes | 70 | 36% |
| Engine | 57 | 29% |
| Unknown Or Other | 34 | 17% |
| Power Train | 27 | 14% |
| Electrical System | 27 | 14% |
| Fuel/Propulsion System | 25 | 13% |
| Vehicle Speed Control | 11 | 6% |
| Forward Collision Avoidance | 8 | 4% |
| Hydraulic | 7 | 4% |
| Back Over Prevention | 6 | 3% |
| Fuel System | 6 | 3% |
| Gasoline | 6 | 3% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2020 GMC Terrain SUV AWD | 5/5 | 5/5 | 5/5 | 4/5 |
| 2020 GMC Terrain SUV FWD | 5/5 | 5/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Power Train,engine - filed 2026-09-08
Having the start stop issue on my terrain and recently over the last few months, it has been using oil everything that sounds exactly like the recall but mine is not included. My start stop is not working and I have to get him since it had only 60,000 miles on it years ago, but nothing was done.
Fuel/Propulsion System - filed 2026-09-02
Fuel pump control module and or the in tank fuel pump failed and or isn’t making proper connection for car to run correctly. Safety was put at risk as car came to abrupt halt while driving. Driver was outside of vehicle at busy intersection for vehicle diagnostics and battery jump. Battery was removed and new batter...
Service Brakes, Hydraulic - filed 2026-08-31
The contact owns a 2020 GMC Terrain. The contact stated that while driving at an undisclosed speed, the vehicle failed to stop as intended. The brake pedal was depressed to the floor, and the vehicle slowed down and eventually stopped. The vehicle was taken to an independent mechanic, where it was diagnosed with a fail...
Diagnose it yourself
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
More for the 2020 GMC Terrain
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.