2020 GMC Terrain power train problems
27 owner complaints filed with NHTSA name the power train on the 2020 GMC Terrain — 14% of all complaints for this model year.
What owners report
“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.”
filed Sep 8, 2026
“Because of the intentional failure of GMC and there promise of “We are Professional Grade”, I almost got plowed down by a semi when the car began to quit on the highway going 60. After pulling into the next driveway, which happened to be a Parker’s Kitchen, and ending up on the curb spot, thanking…”
filed Aug 5, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Start/stop accumulator endcap may have missing boltsCampaign 20V668000 · Oct 29, 2020
Power Train problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2026 Terrain | 5 | 17% |
| 2024 Terrain | 21 | 43% |
| 2023 Terrain | 7 | 18% |
| 2022 Terrain | 8 | 14% |
| 2021 Terrain | 8 | 23% |
| 2019 Terrain | 50 | 27% |
| 2018 Terrain | 41 | 19% |
| 2017 Terrain | 23 | 17% |
| 2016 Terrain | 11 | 7% |
| 2015 Terrain | 21 | 7% |
| 2014 Terrain | 33 | 11% |
| 2013 Terrain | 44 | 12% |
Other reported problem areas on the 2020 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.