2012 GMC Terrain power train problems
37 owner complaints filed with NHTSA name the power train on the 2012 GMC Terrain — 10% of all complaints for this model year.
What owners report
“1. The engine suddenly lost power while driving during evening rush hour and the vehicle would no longer accelerate. 2. Because the vehicle could not maintain speed, I was unable to keep up with traffic, creating a serious safety hazard that could have resulted in a major accident. 3. The vehicle…”
filed Nov 16, 2025
“GMC Consumer Relations Subject: Structural Undercarriage Safety Defect – 2012 GMC Terrain SLE Vehicle Information: Year/Make/Model: 2012 GMC Terrain SLE VIN: [XXX] Mileage at Purchase: 148,305 Date of Purchase: [XXX] Location: Rochester, New York I am filing a complaint regarding a severe…”
filed Sep 15, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Power Train problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2026 Terrain | 4 | 17% |
| 2024 Terrain | 20 | 42% |
| 2023 Terrain | 6 | 17% |
| 2022 Terrain | 7 | 15% |
| 2021 Terrain | 8 | 24% |
| 2020 Terrain | 26 | 14% |
| 2019 Terrain | 50 | 28% |
| 2018 Terrain | 41 | 19% |
| 2017 Terrain | 23 | 17% |
| 2016 Terrain | 11 | 7% |
| 2015 Terrain | 21 | 7% |
| 2014 Terrain | 33 | 11% |
Other reported problem areas on the 2012 GMC Terrain
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.