2021 GMC Acadia engine problems
29 owner complaints filed with NHTSA name the engine on the 2021 GMC Acadia — 20% of all complaints for this model year.
What owners report
“Display suddenly says "Steering assistance reduced, drive with care" Temp gauge goes to C and stays there. Radiator fans speed up and stay on after the car has been turned off. Dealer unable to find a diagnostic code for the problem.”
filed May 30, 2026
“I am submitting this complaint regarding ongoing mechanical and electrical issues with my 2021 GMC ACADIA that have been occurring intermittently for approximately the past year and a half. The primary issues involve the coolant temperature sensor, thermostat system, engine cooling fan, and…”
filed May 9, 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 | 11 | 28% |
| 2022 Acadia | 14 | 30% |
| 2020 Acadia | 24 | 25% |
| 2019 Acadia | 49 | 13% |
| 2018 Acadia | 32 | 8% |
| 2017 Acadia | 61 | 9% |
| 2016 Acadia | 12 | 5% |
| 2015 Acadia | 17 | 7% |
| 2014 Acadia | 45 | 10% |
| 2013 Acadia | 21 | 16% |
Other reported problem areas on the 2021 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.