2021 Chevrolet Trailblazer electrical system problems
41 owner complaints filed with NHTSA name the electrical system on the 2021 Chevrolet Trailblazer — 21% of all complaints for this model year.
What owners report
“Dear Chevy, I am reaching out to you again because I am desperately requesting immediate assistance with my vehicle, which has now become an extremely serious and dangerous safety concern. On Friday, [XXX], I had my vehicle towed to the dealership because of the ongoing mechanical issues I have…”
filed Sep 7, 2026
“I am submitting this report regarding my 2021 Chevrolet Trailblazer because it has been experiencing the "Shift to Park" issue described in the GM bulletin 19-NA-206. Even when the vehicle is shifted into Park, it intermittently displays a "Shift to Park" message and does not recognize that the…”
filed Jul 31, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Trailblazer years
| Year | Reports | Share |
|---|---|---|
| 2025 Trailblazer | 13 | 62% |
| 2024 Trailblazer | 11 | 33% |
| 2023 Trailblazer | 15 | 22% |
| 2022 Trailblazer | 30 | 28% |
| 2009 Trailblazer | 9 | 33% |
| 2008 Trailblazer | 65 | 34% |
| 2007 Trailblazer | 200 | 27% |
| 2006 Trailblazer | 251 | 23% |
| 2005 Trailblazer | 617 | 42% |
| 2004 Trailblazer | 627 | 58% |
| 2003 Trailblazer | 285 | 32% |
| 2002 Trailblazer | 181 | 16% |
Other reported problem areas on the 2021 Chevrolet Trailblazer
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.