2018 GMC Acadia engine problems
33 owner complaints filed with NHTSA name the engine on the 2018 GMC Acadia — 8% of all complaints for this model year.
What owners report
“The car will frequently but not always fail to shut off when the start/stop button is pushed while in Park. The message "shift to park" come up on the display and a yellow light comes on in the button. I have to restart the engine and it often takes as many as 10 attempts to finally shut off the…”
filed Sep 11, 2026
“I am getting the known P0128 code. My engine says it's cold when it's not, my AC isn't working, and I am getting a message that says "Steer assist reduced. Drive with care". This is a known problem and complaint of the GMC Acadia.”
filed May 20, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine problems in other Acadia years
| Year | Reports | Share |
|---|---|---|
| 2025 Acadia | 5 | 8% |
| 2024 Acadia | 9 | 16% |
| 2023 Acadia | 12 | 28% |
| 2022 Acadia | 14 | 29% |
| 2021 Acadia | 29 | 19% |
| 2020 Acadia | 26 | 26% |
| 2019 Acadia | 52 | 14% |
| 2017 Acadia | 61 | 9% |
| 2016 Acadia | 13 | 6% |
| 2015 Acadia | 18 | 7% |
| 2014 Acadia | 45 | 10% |
| 2013 Acadia | 21 | 16% |
Other reported problem areas on the 2018 GMC Acadia
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.