2021 Chevrolet Trailblazer problems & reliability
189 owner complaints filed with NHTSA for the 2021 Chevrolet Trailblazer, alongside 4 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
4 complaints report injuries (5 injured).
Federal crash records (FARS 2020–2023): 2021 Chevrolet Trailblazer vehicles were involved in 26 fatal crashes with 9 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Unknown OR Other | 53 | 28% |
| Electrical System | 39 | 21% |
| Power Train | 38 | 20% |
| Engine | 36 | 19% |
| Service Brakes | 29 | 15% |
| Fuel/propulsion System | 16 | 8% |
| Forward Collision Avoidance | 10 | 5% |
| Structure | 8 | 4% |
| Steering | 6 | 3% |
| Vehicle Speed Control | 5 | 3% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 22,260 miles (middle 50% between 5,750 and 43,621 miles), based on 28 complaints that included mileage.
Complaints by incident 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”
Engine · filed Aug 3, 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 transmission is in…”
Electrical System · filed Jul 31, 2026
“"shift to park" issue on a 21 traiblazer causing your car to not being able to shutdown entirely meanwhile the shift is perfectly on Park.”
Power Train · filed Jul 30, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
749 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Chevrolet Trailblazer. The 10 most recent:
This Preliminary information communicates to the techicians a diagnostic tip if a customer has a complaint of a whistle/wind noise at highway speeds.
PIC6589B · Service Bulletin/Repair Instructions · issued Jul 31, 2026
This Preliminary information communicates to the technician the direction needed when encountering an issue with switching between adaptive cruise control and regular cruise control or an issue with automatic high beam…
PIC6548B · Service Bulletin/Repair Instructions · issued Jul 23, 2026
PI to help diagnose A/C concern
PIT5099J · Service Bulletin/Repair Instructions · issued Jul 21, 2026
This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message.
PIT5966F · Service Bulletin/Repair Instructions · issued Jun 23, 2026
PIP6032B provides diagnostic direction for dealers when encountering transmission leaks
PIP6032C · Service Bulletin/Repair Instructions · issued Jun 3, 2026
Pi created to provide GM dealers with information on gathering information for projection issue
PIC6423A · Service Bulletin/Repair Instructions · issued May 11, 2026
This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues
PIC6551B · Service Bulletin/Repair Instructions · issued May 11, 2026
This PI instructs dealers to install foam around the shifter cable to stop rattling
PIP6029A · Service Bulletin/Repair Instructions · issued Apr 21, 2026
This preliminary information communicates information about how to determine if a wheel and tires size change is available.
PIT3271Q · Service Bulletin/Repair Instructions · issued Apr 1, 2026
This bulletin communicates to a dealer the repair direction that should be taken if they encounter a vibration from the engine when the vehicle is parked facing downhill.
PIC6553B · Service Bulletin/Repair Instructions · issued Mar 30, 2026
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2021 Chevrolet Trailblazer has 4 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2021 Chevrolet Trailblazer?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 22,260 miles — budget accordingly if the car is approaching that mileage.