2020 GMC Terrain electrical system problems
27 owner complaints filed with NHTSA name the electrical system on the 2020 GMC Terrain — 15% of all complaints for this model year.
What owners report
“The back passenger seat exploded and caught fire, burning the back of the seat in front and burning the ceilings. Inside the whole vehicle is black from smoke damage. Incident assessed by fire marshal who has ruled as electrical issue. No warning lights or systems displayed anything.”
filed Jul 18, 2026
“The contact owns a 2020 GMC Terrain. The contact stated that while driving in cold weather at various speeds; moisture accumulated and deactivated the charger, causing the vehicle to go into LIMP Mode and lose drive power. The vehicle was taken to the dealer, who diagnosed the vehicle and…”
filed Feb 9, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2026 Terrain | 1 | 4% |
| 2024 Terrain | 6 | 13% |
| 2023 Terrain | 7 | 19% |
| 2022 Terrain | 5 | 10% |
| 2021 Terrain | 7 | 21% |
| 2019 Terrain | 37 | 21% |
| 2018 Terrain | 35 | 16% |
| 2017 Terrain | 9 | 7% |
| 2016 Terrain | 9 | 6% |
| 2015 Terrain | 31 | 10% |
| 2014 Terrain | 31 | 10% |
| 2013 Terrain | 22 | 6% |
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.