2018 GMC Terrain fuel/propulsion system problems
12 owner complaints filed with NHTSA name the fuel/propulsion system on the 2018 GMC Terrain — 6% of all complaints for this model year.
What owners report
“Turbo boost went out in my vehicle and 3 others with the same engine, different makes/models. Vehicles were serviced at Grayling Car Care 4430 M-72, Grayling, MI 49738 (989) 348-3200. Significant power loss, sluggish acceleration, poor fuel economy, and often strange noises (whining, grinding)…”
filed Jan 29, 2026
“My check engine light comes on intermittently, since March 2024, after having Cabin & Engine air filters replaced. Each time, I’m told it is code P0171. This has happened too many times for my comfort. Usually, it happens around the time my gas gets below 1/2 tank or after I fill up my gas tank…”
filed Feb 21, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Fuel/propulsion System problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2024 Terrain | 10 | 21% |
| 2023 Terrain | 14 | 39% |
| 2022 Terrain | 20 | 42% |
| 2021 Terrain | 2 | 6% |
| 2020 Terrain | 22 | 12% |
| 2019 Terrain | 4 | 2% |
| 2017 Terrain | 4 | 3% |
| 2016 Terrain | 3 | 2% |
| 2015 Terrain | 15 | 5% |
| 2014 Terrain | 15 | 5% |
| 2013 Terrain | 21 | 6% |
| 2012 Terrain | 28 | 8% |
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.