2021 Chevrolet Blazer engine problems
41 owner complaints filed with NHTSA name the engine on the 2021 Chevrolet Blazer — 31% of all complaints for this model year.
What owners report
“Vehicle Information: 2021 Chevrolet Blazer 2.5L engine, VIN [XXX]. Odometer 118000 miles.Description of Incident: While operating the vehicle, the mechanical brake vacuum pump experienced a catastrophic internal failure. The drive gear housing shattered violently without warning, shearing off the…”
filed Sep 17, 2026
“My 2021 Chevrolet Blazer has experienced repeated problems involving the cooling system and is now exhibiting recurring symptoms that concern me about the vehicle’s reliability and safety. In 2023, the vehicle required a radiator/cooling-system repair. In 2024, it again required…”
filed Sep 16, 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 | 10% |
| 2024 Blazer | 6 | 13% |
| 2023 Blazer | 12 | 29% |
| 2022 Blazer | 13 | 27% |
| 2020 Blazer | 68 | 31% |
| 2019 Blazer | 40 | 22% |
| 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.