2024 GMC Terrain power train problems
21 owner complaints filed with NHTSA name the power train on the 2024 GMC Terrain — 43% of all complaints for this model year.
What owners report
“Factory powertrain programming actively locks out 9th gear (overdrive) during freeway driving at speeds exceeding 60–65 mph. The vehicle refuses to upshift from 8th to 9th gear, forcing sustained high-RPM operation during standard highway cruising.”
filed Sep 1, 2026
“The vehicle has experienced a recurring transmission-related defect that has required multiple repair attempts by an authorized GMC dealership. The transmission system has also exhibited fluid leakage. Despite prior repairs, the problem has continued to reoccur. Transmission and associated…”
filed Jun 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Power Train problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2026 Terrain | 5 | 17% |
| 2023 Terrain | 7 | 18% |
| 2022 Terrain | 8 | 14% |
| 2021 Terrain | 8 | 23% |
| 2020 Terrain | 27 | 14% |
| 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 2024 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.