2019 GMC Terrain electrical system problems
37 owner complaints filed with NHTSA name the electrical system on the 2019 GMC Terrain — 21% of all complaints for this model year.
What owners report
“I bought this Terrain brand new from Betten Baker Chevrolet in Muskegon Mi in 2019 with 500 miles. That same year we had transmission Slippage causing it to slip out of gear then slam back into gear while driving. I took it to the dealer to have it looked at. They did nothing and informed me it was…”
filed Dec 5, 2025
“Vehicle has had check engine light and engine reduced power flicking on and off for months, randomly reducing power on highway or nearly causing accidents. Brought car to GMC dealer, they said it was underboost code and needed new turbo. Paid over 7,000$ for repair. Next morning, same issue still…”
filed Nov 11, 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% |
| 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 2019 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.