2018 GMC Terrain electrical system problems
35 owner complaints filed with NHTSA name the electrical system on the 2018 GMC Terrain — 16% of all complaints for this model year.
What owners report
“The infotainment system will just randomly start going haywire and when it happens, you cannot use the touchscreen. It will try to randomly delete app icons such as the camera, it will try to delete connected phones, it will try to delete radio favorites and it will move app icons all around. These…”
filed Dec 11, 2025
“The contact owns a 2018 GMC Terrain. The contact stated that the transmission was shifting gear erratically. The contact stated that the doors were locking and unlocking independently, and the instrument cluster was blank. There was an abnormal beeping sound coming from the vehicle. Additionally…”
filed Nov 7, 2025
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% |
| 2020 Terrain | 27 | 15% |
| 2019 Terrain | 37 | 21% |
| 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 2018 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.