2021 Chevrolet Trailblazer engine problems
36 owner complaints filed with NHTSA name the engine on the 2021 Chevrolet Trailblazer — 19% of all complaints for this model year.
What owners report
“My timing belt snapped prematurely, causing a total loss of engine power while driving on the highway, which is a severe safety hazard”
filed Aug 3, 2026
“My trailblazer will not shift properly into drive from park or reverse. GM calls this a "loss of forward motion" or "delayed forward engagement" in their service bulletin TSB-24-NA-009. It is a safety issue because you never know when or how long the vehicle will take to engage and allow forward…”
filed Jul 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine problems in other Trailblazer years
| Year | Reports | Share |
|---|---|---|
| 2025 Trailblazer | 3 | 16% |
| 2024 Trailblazer | 9 | 28% |
| 2023 Trailblazer | 14 | 23% |
| 2022 Trailblazer | 16 | 15% |
| 2009 Trailblazer | 2 | 7% |
| 2008 Trailblazer | 21 | 11% |
| 2007 Trailblazer | 22 | 3% |
| 2006 Trailblazer | 43 | 4% |
| 2005 Trailblazer | 30 | 2% |
| 2004 Trailblazer | 16 | 1% |
| 2003 Trailblazer | 15 | 2% |
| 2002 Trailblazer | 17 | 1% |
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.