2021 Chevrolet Blazer problems, complaints & recalls
Most-reported problem areas: Service Brakes (19) · Engine (19) · Power Train (15)
🧭 Reliability snapshot
Compared against other Chevrolet Blazer model years — complaint volume vs the model's median year, recalls and severity. How we score →
🛣️ Complaints by mileage
26 NHTSA complaints that reported an odometer reading.
Safety recalls (1)
Seat Belts:critical Fasteners 2020-12-23 · campaign 20V811000 · 470 vehicles
Defect: General Motors, LLC (GM) is recalling certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra 1500, 2500 and 3500, Yukon, Yukon XL, Cadillac Escalade and Escalade ESV and Chevrolet Blazer, Camaro, Colorado, Equinox, Silverado 1500, 2500 and 3500, Suburban and Tahoe vehicles. Incorrect bolts may have been used at one or more fastening locations to secure the seat belts to the vehicle. If an incorrect bolt was used, the seat belt may not be properly attached to the vehicle.
Risk: If a seat belt assembly is not properly attached to the vehicle, the seat belt may not properly restrain an occupant in the event of a crash, increasing the risk of injury.
Fix: GM will notify owners, and dealers will replace the suspect bolts, free of charge. The recall began January 29, 2021. Owners may contact GMC customer service at 1-800-462-8785, Cadillac customer service at 1-800-458-8006, or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N202322230.
Service bulletins (815)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-10-26 · GM Update N25-250552 · Over The Air
• improvements to onstar functionality.
Unknown Or Other 2026-09-26 · PIT5698F · Service Bulletin/Repair Instructions
this pi provides diagnostics tips on how the lin bus works and how to diagnosis it.
Unknown Or Other 2026-09-04 · PIP4902W · Service Bulletin/Repair Instructions
this preliminary information advises a dealer on how to email gds2 session logs into technical assistance.
Unknown Or Other 2026-08-20 · PIC6551C · Service Bulletin/Repair Instructions
this preliminary information communicates to dealer to perform a mec reset for wireless projection issues
Unknown Or Other 2026-07-21 · PIT5099J · Service Bulletin/Repair Instructions
pi to help diagnose a/c concern
Unknown Or Other 2026-06-23 · PIT5966F · Service Bulletin/Repair Instructions
this preliminary information communicates an issue with an ota pending message still displayed after an ota event and how to reset/clear the message.
Showing the 6 most recent of 815 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-10-23 · Unknown Or Other“in february 2023 we noticed coolant on our garage floor. car was taken to gm dealership was told radiator seams were leaking. replaced radiator february 14th 2023 and car had 14,597 miles cost covered by gm warranty. on october 8, 2026 vehicle taken to second gm dealership for driver assist not working be careful. the cooling fan loud when car was …”
2026-10-22 · Power Train“torque converters are going out and causing people to need new transmissions. i was told by dealership that evaluated mine this is a known problem! i’ve also encountered others who have same issue with their cars. …”
2026-10-18 · Unknown Or Other“my wife and i were just driving and suddenly the motor started stopping installing. we managed to get over toward the curb and shut the motor off and restart it. then it ran normal. when it did stall out, and we made it to the curb, it shut itself off. that was yesterday then this morning it started to do it a little bit when we left the house.…”
2026-10-15 · Electrical System“the contact owns a 2021 chevrolet blazer. the contact stated that while driving at 35 mph, a loud cracking sound was heard and there was gray coming from underneath the hood. the contact parked the vehicle. additionally, the steering wheel failed to turn in the intended direction. upon opening the hood, the contact noticed gray smoke under the hood…”
2026-10-09 · Unknown Or Other“steering assist reduced light came on, fan kept running after shutting off, brought to dealer to see if it was covered under the gm special coverage for thermostat, they say the radiator needs to be replaced for a leak. i looked it was leaking a bit on the top driverside corner, not actively leaking but a bit of corrosion where it had. so they want…”
2026-10-01 · Electrical System“the main instrument cluster where the speedometer and fuel gauge etc etc reside went blank during operation of the vehicle. i wasn't able to pull over safely until my destination was reached. restarting the car seemed to "solve" the issue. …”
2026-09-30 · Service Brakes, Hydraulic · 120,000 mi“the contact owns a 2021 chevrolet blazer. the contact stated that while driving at an undisclosed speed and making a turn, the vehicle lost braking functionality. the brake pedal was depressed to the floorboard. after exiting the vehicle, the contact became aware of a fluid leak underneath the vehicle. the "brake failure" warning light was illumina…”
2026-09-26 · Engine“my 2021 chevy blazer is leaking oil at 70,000 miles chevy only recalled under special warranty for camshaft carrier it appears chevy put in a glue for them seals that comes off unfortunately they don’t recall all blazers just some but i am having the same issue as that special warranty. it’s a safety concern because no oil in the car can blow up th…”
2026-09-17 · Service Brakes“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 end of the connecting engine camshaft. because this …”
2026-09-16 · Wheels“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 radiator/cooling-system repair, which was performed under warranty. t…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.