Chevrolet Blazer Complaints (2021)

128 consumer complaints on file.

#11693729October 15, 2025
ELECTRICAL SYSTEM
In March after a short drive, 24 miles, the car temp was pegged at Cold. After turning off the car, the fan continued to run several minutes. After a quick internet search several posts commented on a similar issue with their vehicle. Two potential issues were identified - thermostat failure or programming issue. With less than 40,000 miles on the car, I purchased a diagnostic tool. Running the tool program two errors were identified. After resetting the sensors, the problem went away. In September, yesterday and today the problem occurred again - and the error reset fixes the issue. I believe Chevy needs to fix the issue with a recall to either update programming or replace the thermostat. [Several posts state the thermostat replacement didn't fix the issue and is very expensive.]
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693294October 14, 2025
ELECTRICAL SYSTEM:INSTRUMENT PANEL:SPEEDOMETER/ODOMETER
Odometer Fraud. The contact purchased a 2021 Chevrolet Blazer. It was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 9,967, and at the time of registration, it was discovered that the mileage was approximately 38,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11692416October 9, 2025
STEERING, ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Request for Recall Review – 2021 Chevrolet Blazer Steering Assist and Cooling Fan Issue Hello, I am writing to report a recurring issue with my 2021 Chevrolet Blazer and to request that this concern be reviewed for possible recall or warranty coverage. The vehicle frequently displays an “Action Required: Steering Assist is Reduced. Drive with Care” message while driving. Additionally, after shutting off the vehicle, the engine cooling fan continues to run for up to 20 minutes, as if the vehicle is overheating. This issue has occurred multiple times and raises concerns about potential problems with the steering assist system, cooling system, or electrical sensors. I’ve noticed that other Blazer owners have reported similar experiences online, which suggests this could be a broader issue. Could you please confirm whether there are any existing recalls, technical service bulletins (TSBs), or warranty programs addressing this condition? I would also appreciate guidance on the next steps for inspection or documentation. Vehicle Information: Year/Model: 2021 Chevrolet Blazer
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11690646September 30, 2025
POWER TRAIN
The contact owns a 2021 Chevrolet Blazer. The contact stated that while her husband was driving 60 MPH, the "Service Engine Soon" message was displayed. The contact's husband pulled over to the side of the road. The contact's husband used his personal FIXD machine to diagnose the vehicle. The contact’s husband retrieved DTC: P023F (Powertrain Control Module Detected a problem in the Electrical Pathway supplying power to the Fuel Pump). The vehicle was towed to an independent mechanic who diagnosed the vehicle and determined that the fuel pump had failed. The vehicle was then towed to the dealer. The vehicle has not been diagnosed. The contact related the failure to Manufacturer's Recall Number: N252516900. However, the VIN was not included. The manufacturer was not made aware of the failure. The failure mileage was 90,493.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11689652September 25, 2025
ENGINE
Radiator leak, leaking antifreeze
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11689086September 23, 2025
POWER TRAIN
Steering assist reduced warning came on with engine light. When car turned off , radiator fan continued running for a few minutes before turning off. AC would also not work during this time. Issue has been intermittent. Was told the thermostat was getting stuck open and needs replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11688584September 20, 2025
SERVICE BRAKES
Brake booster failed after 50k miles needing repair. Brake became very still, prolonging the time it takes to stop the vehicle
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11688507September 19, 2025
ENGINE
Was informed at today's oil change that my radiator is leaking and it's something that they are seeing a bunch.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11687536September 16, 2025
UNKNOWN OR OTHER
my vehicle is roughly 40k miles. The temp gauge was stuck on C the cooling fan was running continuously even when the car was off and the checked engine appeared. The mechanic at the dealership said the thermostat is stuck in open position causing the computer not to know if the engine is cooling properly. For a vehicle less then 5 years old with upkept maintenance and doing a bit of research... This is a common occurrence in Chevy vehicles. Therefore, the manufacturer needs to look into recalling this issue costing people thousands of dollars. This was my first Chevy and probably my last.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11685984September 9, 2025
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
Auto braking system went off when I was at stop light & began to move forward (was 2nd in line of cars) and I accelerated. On the roadway, there are construction 'steel plates' laying on the ground in the area that all cars must drive over (I have driven over them in my same Blazer before) because we have no choice. One I pressed on gas & began moving over those plates, the Blazer stopped itself VERY abruptly & jerked my head forward & dash said I had to press on brake let off or something in order to move again - it was all very fast & I had a line of traffic behind me at 5:15 pm on a Friday (9/5/25). I'm very luck I did not get hit from behind & car behind me paid attention! That is the 3rd time my car has stopped suddenly; 2 times before it was when going up my very steep driveway so I had no one behind me & I wasn't as shook up - Chevy needs to REALLY look at this! It is a hazzard!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684653September 3, 2025
FUEL/PROPULSION SYSTEM
I was driving down 776 (a busy highway)Blazer completely shut off, so scary almost got hit by a semi, I don’t know how he managed to get around me , I jumped out of car! Sure thought it was my day to die! Called police for help! Had it towed home then to garage , was told it was the electrical fuel modular! Haven’t slept right in 3 days ! I’m still so shaken up!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682555August 23, 2025
UNKNOWN OR OTHER
The temperature gauge or thermostat has been replaced 3 times and continues to fail
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678892August 6, 2025
ENGINE, UNKNOWN OR OTHER
At routine oil change dealer noticed radiator was leaking. 60,840 miles Took it to an independent repair shop who confirmed radiator needed to be replaced. Has also seen same on other 2021 Blazers. No visible signs of leaking (fluid on garage floor) or warning indicators. No recall issued on this, however, seems to be a common problem on 2021 Blazer based on Chevy forums. Due to safety issues, vehicle is currently in shop for the needed replacement repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11677356July 30, 2025
SERVICE BRAKES
My name is [XXX] and I was a passenger in our 2021 Chevy Blazer with our young child in the back seat when the brakes suddenly failed while we were driving on the freeway. The brake pedal went stiff and wouldn’t respond. It was terrifying — we truly felt like we were going to crash. I was panicked, and my child was crying. Since then, I’ve been too afraid to drive or ride in this vehicle, even if it gets repaired. This isn’t the first issue with the car, and GM has not resolved it in a timely or helpful way. The vehicle is currently at the dealership and we are paying for a rental car out of pocket. I’m reporting this because I believe this vehicle poses a serious safety risk to families like mine. I’m asking NHTSA to please investigate this issue before someone gets hurt. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676544July 28, 2025
SERVICE BRAKES
While driving my 2021 Chevrolet Blazer LT on the freeway with my wife and child, the “Brake Assist” warning came on and the brake pedal suddenly became extremely stiff. I was going about 65 mph, and it became difficult to slow down safely. We were terrified. This created a serious safety hazard, as I almost couldn’t stop in time and could have caused a crash or gotten someone killed. The check engine light came on as well. I had previously taken the vehicle in for a similar rattling or braking noise back in 2021 and was told it was “fine.” Now the issue seems to have gotten worse. I have since learned that other owners have reported similar brake assist issues on 2021 Chevrolet Blazers, and it appears there are service bulletins but no recall yet. I am extremely concerned that GM has not addressed this defect, especially since it happened without warning and endangered my family’s lives. I am requesting a full investigation into this issue and for GM to take full responsibility for the repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675890July 24, 2025
SERVICE BRAKES, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
Brakes bottomed out. Message on my dash board said “Brake System Failure reduce speed to 62” and the brake went on the way to the floor.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675829July 24, 2025
FUEL SYSTEM, GASOLINE
The contact owns a 2021 Chevrolet Blazer. The contact stated that while the vehicle was parked, while attempting to start the vehicle, the vehicle failed to start. The vehicle was towed to a dealer where it was diagnosed and determined that the fuel pump module needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 81,123.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675095July 21, 2025
FUEL/PROPULSION SYSTEM, ELECTRICAL SYSTEM
The vehicle has 14,000 miles on it and the fuel pump control module has gone out on it. This happened while away from home and could’ve caused a serious situation if this had happened in a remote area where customer could’ve been stranded or if customer were pulling onto a busy road. Luckily it happened in the parking lot of a store. The vehicle was running fine on the way to the store. When customer came back out to the vehicle it cranked up but then stalled which also left customer in between parking rows, potentially causing an accident. I have the old fuel pump control module readily available for inspection. Customer had an updated version that replaced the original one that was in it. There were no signs or indications that this was going to happen until it did. I know there was a big issue / recall with the modules on Silverado and Tahoe’s etc. around the same manufacturing era. For reference- 1/2 tank of fuel, no CEL until after it happened, approx. 88° outside, coolant temp near 120°, vehicle battery had good voltage and battery cells are good
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675087July 21, 2025
ENGINE, SUSPENSION, FORWARD COLLISION AVOIDANCE: WARNINGS
The first incident started on 08/16/2024, 2 days after buying the vehicle used from Dealership. I started getting notifications stating "Service-Front Camera not available" and sure enough, I no longer had a front camera, which then means I no longer have front collision alerts. Then I started getting the random notifications to drive carefully because drivers assistance has been reduced, and now my vehicle's fan will randomly run for up to 30 minutes after it has been shut off and even after a less than 2 mile drive to gas station and back home, it does this. Last item is the vehicle pulls to the right, and I have not hit anything nor has it ever been in an accident prior to my purchase, and my brakes squeal horribly, which shouldn't be happening condidering I haven't even driven the vehicle 5,000 miles in the year since I bought it !
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670138June 30, 2025
FUEL/PROPULSION SYSTEM
Fuel pump module. Driving highway speeds lost all engine power as car sputtered to a stop. Luckily car srill ran enough to maintain power steering and brake function. No warning lights.Thought it was bad fuel as I had filled the tank the prior evening with little driving after that. Towed to dealership after spending 2 hours in 100 degree plus weather on the side of the highway. Dealership states it is the fuel pump module. Dealership is waiting on new unit to be installed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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