2020 GMC Terrain vehicle speed control problems
11 owner complaints filed with NHTSA name the vehicle speed control on the 2020 GMC Terrain — 6% of all complaints for this model year.
What owners report
“Random problems accelerating. Like I can be pulling out of my parking spot in revese then switch it to drive an try to move and it won’t move at all or very slowly then out of nowhere it accelerates fast”
filed Apr 16, 2026
“On 6/22/2025, brakes stopped working while trying to make a turn. Next multiple engines light came and car went into reduced speed mode. As I tried to find a safe place to stop, the vehicle went into limp mode and shut down in the middle of the road. The dealership said the issue was the vacuum…”
filed Jun 26, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Vehicle Speed Control problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2024 Terrain | 3 | 6% |
| 2023 Terrain | 2 | 6% |
| 2021 Terrain | 1 | 3% |
| 2019 Terrain | 9 | 5% |
| 2018 Terrain | 8 | 4% |
| 2017 Terrain | 2 | 2% |
| 2016 Terrain | 4 | 3% |
| 2015 Terrain | 3 | 1% |
| 2014 Terrain | 3 | 1% |
| 2013 Terrain | 5 | 1% |
| 2012 Terrain | 11 | 3% |
| 2011 Terrain | 18 | 5% |
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.