2021 Chevrolet Blazer engine problems
36 owner complaints filed with NHTSA name the engine on the 2021 Chevrolet Blazer — 29% of all complaints for this model year.
What owners report
“The thermostat malfunctioned causing an error message regarding “steering assist is reduced”. When I parked and turned off, the engine fan continued to run. When car was restarted, the temp gauge inside was stuck at C. Took to dealership and they assessed. They repaired the thermostat under power…”
filed Jun 23, 2026
“The thermometer and thermometer sensor are glitching . The engine temp needle will not rise at all, the engine fan will run the whole time driving and then when it is turned off will run for 10 min . Right before this happens a notice shows the guided steering is being limited. I disconnected the…”
filed Jun 22, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine problems in other Blazer years
| Year | Reports | Share |
|---|---|---|
| 2025 Blazer | 3 | 12% |
| 2024 Blazer | 6 | 14% |
| 2023 Blazer | 12 | 30% |
| 2022 Blazer | 13 | 30% |
| 2020 Blazer | 68 | 32% |
| 2019 Blazer | 38 | 21% |
| 2006 Blazer | 2 | 11% |
| 2002 Blazer | 3 | 1% |
| 2000 Blazer | 1 | 0% |
| 1999 Blazer | 2 | 0% |
| 1998 Blazer | 2 | 0% |
| 1996 Blazer | 1 | 0% |
Other reported problem areas on the 2021 Chevrolet Blazer
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.