2020 GMC Terrain problems and complaints
Owners have filed 197 complaints with NHTSA about the 2020 GMC Terrain. The most-reported areas: Service Brakes (72), Engine (58), Unknown Or Other (34).
Key takeaways
- 197 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 | 72 | 37% |
| Engine | 58 | 29% |
| Unknown Or Other | 34 | 17% |
| Power Train | 28 | 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.
Service Brakes - filed 2026-09-29
While driving at the speed limit the vacuum pump failed on my 2020 GMC Terrain. This failure led to me enter an intersection with heavy cross traffic, nearly striking g several vehicles. This is the 3rd time I have had to replace this pump in 2 years. The pump explodes sending chards of metal into the engine leading...
Power Train,service Brakes,engine - filed 2026-09-23
While driving my 2020 GMC Terrain, I experienced a sudden loss of normal braking assistance. I had been traveling on the highway and exited onto a main road. As I approached a red traffic light at approximately 50 mph and attempted to brake, the vehicle would not stop normally. I was unable to stop for the red light an...
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.
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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.