2020 GMC Sierra 1500 engine and engine cooling problems
19 owner complaints filed with NHTSA name the engine and engine cooling on the 2020 GMC Sierra 1500 — 4% of all complaints for this model year.
What owners report
“The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving approximately 55 MPH, the vehicle started losing power and decelerated. The check engine warning light was flashing with several unknown messages displayed. The vehicle was parked on the side of the road and later towed…”
filed Sep 14, 2026
“The contact owns a 2020 GMC Sierra 1500. The contact stated that while accelerating from a complete stop on several occasions, an abnormal clicking sound was heard from the engine compartment. The vehicle was taken to the dealer, where it was diagnosed with a failed fan belt pulley. The vehicle was…”
filed Jul 8, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine and Engine Cooling problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2025 Sierra 1500 | 3 | 3% |
| 2024 Sierra 1500 | 30 | 8% |
| 2023 Sierra 1500 | 22 | 5% |
| 2022 Sierra 1500 | 28 | 5% |
| 2021 Sierra 1500 | 49 | 9% |
| 2019 Sierra 1500 | 25 | 4% |
| 2018 Sierra 1500 | 6 | 2% |
| 2017 Sierra 1500 | 2 | 1% |
| 2016 Sierra 1500 | 3 | 1% |
| 2015 Sierra 1500 | 1 | 0% |
| 2014 Sierra 1500 | 5 | 1% |
| 2012 Sierra 1500 | 1 | 1% |
Other reported problem areas on the 2020 GMC Sierra 1500
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.