2021 Chevrolet Blazer electrical system problems
38 owner complaints filed with NHTSA name the electrical system on the 2021 Chevrolet Blazer — 29% of all complaints for this model year.
What owners report
“The contact owns a 2021 Chevrolet Blazer. The contact stated that while driving 40 MPH, the vehicle stalled and was unable to be restarted. The vehicle was towed to the residence. The husband was a mechanic and discovered the 350-amp fuse failure. The fuse was replaced, and the vehicle was…”
filed Sep 2, 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.
Electrical System problems in other Blazer years
| Year | Reports | Share |
|---|---|---|
| 2025 Blazer | 8 | 26% |
| 2024 Blazer | 7 | 16% |
| 2023 Blazer | 6 | 14% |
| 2022 Blazer | 15 | 31% |
| 2020 Blazer | 75 | 35% |
| 2019 Blazer | 59 | 32% |
| 2006 Blazer | 2 | 11% |
| 2004 Blazer | 10 | 20% |
| 2003 Blazer | 9 | 12% |
| 2002 Blazer | 21 | 9% |
| 2001 Blazer | 40 | 12% |
| 2000 Blazer | 49 | 8% |
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.