2020 GMC Terrain problems and complaints
Owners have filed 198 complaints with NHTSA about the 2020 GMC Terrain. The most-reported areas: Service Brakes (73), Engine (58), Unknown Or Other (34).
Key takeaways
- 198 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 | 73 | 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% |
| Hydraulic | 8 | 4% |
| Forward Collision Avoidance | 8 | 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%.
Parts for the 2020 GMC Terrain
GarageDex's verified specs for this car. Each Buy button searches Amazon for that exact part.
- Battery
- Engine oil
- Oil filter
- Engine air filter
- Cabin air filter
- Wiper blades
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| 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, Hydraulic - filed 2026-10-27
The contact owns a 2020 GMC Terrain. The contact stated that while driving 45 MPH, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The transmission then sputtered. The vehicle was uncontrollable, the brake pedal was depressed; however, the vehicle failed to stop as intended. ...
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...
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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.