2021 Chevrolet Blazer Safety Report
2021 Chevrolet Blazer Safety Report
Safety Decision Cockpit for the 2021 Chevrolet Blazer
This page is the hub for deciding what to inspect next on the 2021 Chevrolet Blazer. It connects recall campaigns, owner complaint patterns, service bulletins, sibling model years, component issue hubs, and the model buying guide so a shopper or owner can move from a single report into the wider safety graph.
| Signal | Value | What to inspect next |
|---|---|---|
| Recall burden | Moderate (1) | Review campaign numbers, affected components, and dealer remedies below. |
| Owner complaints | High (109) | Scan complaint narratives for recurring symptoms, mileage, crashes, fires, injuries, and dates. |
| Crash and fire reports | 5 | Treat any crash, fire, injury, or fatality-linked pattern as a priority pre-purchase inspection item. |
| Primary component hub | Service Brakes | Compare service brakes issues across vehicles. |
| Cleaner nearby model year | 2025 | Compare against the 2025 Chevrolet Blazer with 20 complaints and 1 recalls. |
| Riskier nearby model year | 2020 | Check the 2020 Chevrolet Blazer before buying across this generation. |
Chevrolet Blazer Year-by-Year Comparison
The safest purchase decision usually comes from comparing neighboring model years, not reading a single page in isolation. The table below uses only validated Chevrolet Blazer years already present in the cleaned NHTSA dataset, so each comparison links to a real vehicle safety report rather than a generated combination.
| Model Year | Complaints | Recalls | Use case |
|---|---|---|---|
| 2022 Chevrolet Blazer | 34 | 1 | Compare as a potentially cleaner alternative. |
| 2020 Chevrolet Blazer | 182 | 3 | Inspect as a potentially higher-complaint year. |
| 2023 Chevrolet Blazer | 31 | 2 | Compare as a potentially cleaner alternative. |
| 2019 Chevrolet Blazer | 174 | 2 | Inspect as a potentially higher-complaint year. |
| 2024 Chevrolet Blazer | 32 | 1 | Compare as a potentially cleaner alternative. |
| 2025 Chevrolet Blazer | 20 | 1 | Compare as a potentially cleaner alternative. |
2021 Chevrolet Blazer Complaint Theme Map
Complaint counts become more useful when they are grouped into inspection themes. For the 2021 Chevrolet Blazer, these are the component areas with the clearest NHTSA complaint signals. Use each link to jump from this single vehicle into broader component hubs and make-specific issue pages.
Service Brakes
13 owner complaints mention this component in the current safety profile.
All Service Brakes issues Chevrolet onlyElectrical System
12 owner complaints mention this component in the current safety profile.
All Electrical System issues Chevrolet onlyEngine
10 owner complaints mention this component in the current safety profile.
All Engine issues Chevrolet onlyFuel/Propulsion System
7 owner complaints mention this component in the current safety profile.
All Fuel/Propulsion System issues Chevrolet onlyPower Train
6 owner complaints mention this component in the current safety profile.
All Power Train issues Chevrolet onlyUnknown Or Other
6 owner complaints mention this component in the current safety profile.
All Unknown Or Other issues Chevrolet onlyAI Safety Analysis for the 2021 Chevrolet Blazer
Reliability Score
The 2021 Chevrolet Blazer receives a reliability score of 5 out of 100 based on analysis of NHTSA complaint data, recall history, crash reports, and safety ratings. This indicates below-average reliability. Significant issues have been reported by owners and should be carefully evaluated before purchase.
NHTSA Safety Ratings for the 2021 Chevrolet Blazer
The National Highway Traffic Safety Administration (NHTSA) evaluates vehicles through controlled crash tests and assigns star ratings from 1 to 5, with 5 being the safest.
Known Issues for the 2021 Chevrolet Blazer
The following issues have been identified from NHTSA complaint data and owner reports for the 2021 Chevrolet Blazer:
| Issue | Severity | Frequency | Typical Mileage |
|---|---|---|---|
| Coolant And Radiator Failures Multiple reports of radiator failures causing coolant leaks and engine issues, often requiring multiple replacements. |
High | Common | 42k-55k miles |
| Throttle Body Failure A throttle body failure was reported at 48,000 miles, leading to a check engine light and loud fan sound. |
Medium | Common | 48k miles |
| Electrical System Issues Several electrical system malfunctions, including warning lights and electrical malfunctions, have been reported. |
Medium | Common | varies miles |
| Thermostat Malfunction Thermostat issues have been reported, causing warning messages and reduced steering assist. |
Low | Common | varies miles |
Common Problems Reported by Owners
Based on NHTSA complaint data, the following components account for the majority of reported issues with the 2021 Chevrolet Blazer:
30% of reported issues involve coolant and radiator failures.
25% of reported issues involve electrical system malfunctions.
10% of reported issues involve throttle body failures.
5% of reported issues involve thermostat malfunctions.
Recall Details for the 2021 Chevrolet Blazer
The following 1 recall has been issued for the 2021 Chevrolet Blazer by NHTSA:
Summary: 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.
Consequence: 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.
Remedy: 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.
NHTSA Complaint Summaries for the 2021 Chevrolet Blazer
Below are complaint narratives filed by owners of the 2021 Chevrolet Blazer with the National Highway Traffic Safety Administration. 1 complaint involved crashes. 1 reported injuries or fatalities.
The contact owns a 2021 Chevrolet Blazer. The contact stated that while attempting to start the vehicle, several unknown warning lights illuminated, and other lights inside the vehicle flashed on and off. The contact stated that the failure also occurred while driving at various speeds. A dealer was contacted. The vehicle was taken to several dealers for diagnostic tests; however, the diagnostic r...
Coolant smell when parked with engine running. Radiator was replaced under warranty at 16,000 miles Coolant smell again 49,000 miles. "Pressure tested at dealership with following notes: "Found radiator core on driver side seeping/leaking. provided estimate on cost. no repair made during this visit." Many forums on 2021 Chevrolet Blazer note poor quality in radiators. This would be the 3rd radiat...
My 2021 Chevy blazer Lt v6, has a service bulletin extending warranty on thermostat malfunction, that also causes the fans to run after the car is off. My vechicle was experiencing this issue, went into my local dealer, they claim thats not my issue, I need a new radiator, that has never leaked, or the car running hot. Beyond that the radiator has a service bulletin, they can fail, do to poor qu...
At 48,000 miles, check engine light came on and loud fan sound continued after turning car off. Took car to dealership where I was informed I needed a new radiator and it is not covered by warranty.
This submission is an additional report related to NHTSA complaint #11714381. At approximately 55,000 miles, my 2021 Chevrolet Blazer experienced a sudden throttle body failure while driving. The vehicle entered reduced engine power/limp mode without warning and acceleration was significantly limited. This created a safety concern while driving in traffic, particularly when merging and crossing i...
The 2021 GMC Blazer (and related Chevy Blazer models) is experiencing recurring radiator failures, often requiring multiple replacements within short timeframes. The radiator was replaced in March 2024 and in early 2025 I went for an oil change and complained of smelling coolant and asked if it could be checked and was told nothing was wrong. I was told again in November 2025 that it has a leak...
Around 55,000 miles, my 2021 Chevrolet Blazer experienced a throttle body failure. The check engine light illuminated and the vehicle entered a reduced power/limp mode condition. Throttle response was significantly limited, and the vehicle could not accelerate normally. While the vehicle remained drivable, it took substantially longer to reach speed, which could pose a safety risk when merging int...
Thermostat issues, gives warning steering assist decreased and then eventually check engine light, vehicle thermostat does not react/reach normal temperature, fan continues to blow after car is turned off for 5-15min, AC does not blow cool air or warm if heat turned up
Radiator failure caused power steering assist to not function properly and insufficient vehicle heat function. Engine electric fan would run continuously after vehicle shutdown.
For about a week and a half my car had made a high pitched wheezing/hubbing sound when started cold. This occurred at all temperatures cold and warm. Yesterday December 13th I went to run some errands and about a mile into my drive my 2021 3lt 3.6 V6 Chevrolet Blazer lost the ability to power itself. There was no electrical problem however the power train lost power all gears drive and reverse. I ...
"Steering assist reduced" message was displayed. At the same time the temperature gauge stopped working and after I shut the car off, the motor fan ran full force for 10+ minutes. Shows no check engine light.
My 2021 Chevrolet Blazer experienced a radiator failure at approximately 42,000 miles. The radiator and cooling system malfunctioned, causing coolant loss and triggering a warning light on the instrument panel. The failed radiator is available for inspection upon request. This defect put my safety and the safety of others at risk because a compromised radiator can lead to engine overheating, sudd...
Driving along vehicle shut down in middle of road replace fuel pump, fuel module control in August 2025. Now both top and bottom fuel hose needs replacing. On Nov 2025 I smelled gas and vehicle shut down
In September 2023, when getting my vehicle serviced for a routine oil change, I was told there was a leak in my radiator. They replaced the entire thing under warranty. On November 15th, 2025, while driving on the highway heading home from out of town with my children, an error flashed up saying “steering assist is reduced – drive with care” Upon arriving home, the fan on my car was running on hi...
The contact owned a 2021 Chevrolet Blazer. The contact stated that while driving at 30 MPH, a 2012 Mazda CX-7, allegedly going at 70 MPH traveled through an intersection and crashed into her vehicle. The Mazda later crashed into another unknown vehicle. All the air bags deployed; however, the driver's side air bag exploded in her face. The air bag dust was in the vehicle. The contact was rendered...
Car was running fine yesterday, today does not want to start. Thought it was the battery, bought anew battery. Still wouldn't start. Rest of cat is getting great power. Code reader is reading its a fuel pump control moduler which just so happens to be in an open recall for my exact year of vehicle yet my vin number does not pop up on the GMC website under active recall. I have a 2021 chevy blaze...
Action Required "Steering Assist Warning" drive with caution, Temp gage reads cold, A/C stops working, engine cooling fan runs on high speed (even after the engine is shut off), pending P2018 code, with no Check Engine Light (CEL). Replaced Engine coolant Temperature (ECT) sensor, problem did not go away. Several reviews suggest to replace the thermostat, check fuses for proper insertion, rerout...
See attached document for complaint.
I was driving at approx 45 mph when my car lost all ability to accelerate and shut down in the street. Flashing check engine light and esc warning on the screen. It would try to start but wouldn't. I had it towed to a mechanic who diagnosed and informed me that it is the Fuel pump power control module. Upon review he I formed me that there was a recall posted in September 2025 for 2021 Blazer on t...
I PURCHASED MY 21 CHEVY BLAZER IN 2024 AND HAD A FEW PROBLEMS WITH A TRANSMISSION PROBLEM. THE VEHICLE WOULD STOP AND JERK WHENEVER I DROVE IT. I TOOK IT TO THE DEALER A FEW TIMES FOR REPAIR. THEY CLAIMED TO HAVE FIXED THE PROBLEM, BUT IT STARTED AGAIN SEVERAL MONTHS LATER. THE VEHICLE HAS APPROX 82,000 MILES ON IT. I HEARD THAT THERE WERE SOME RECALLS ON THESE VEHICLES, BUT NOT SURE IF MINE IS ON...
Showing 20 of 109 complaints. Additional complaints are available via the NHTSA database.
Frequently Asked Questions About the 2021 Chevrolet Blazer
Has the 2021 CHEVROLET BLAZER been recalled?
Yes, the 2021 CHEVROLET BLAZER has 1 recall on record with NHTSA. Each recall addresses a specific safety defect identified by the manufacturer or NHTSA.
How many complaints does the 2021 CHEVROLET BLAZER have?
The 2021 CHEVROLET BLAZER has 109 complaints filed with NHTSA. Of these, 4 involved crashes. 3 injuries and 0 deaths have been reported.
What is the safety rating for the 2021 CHEVROLET BLAZER?
The 2021 CHEVROLET BLAZER received an overall NHTSA safety rating of excellent (5/5). Frontal crash: 5/5. Side crash: 5/5. Rollover: 4/5.
What are the most common problems with the 2021 CHEVROLET BLAZER?
The most commonly reported problems with the 2021 CHEVROLET BLAZER involve service brakes (13 complaints), electrical system (12 complaints), engine (10 complaints). Other affected components include fuel/propulsion system, power train, unknown or other.
How many crash reports does the 2021 CHEVROLET BLAZER have?
There are 4 crash reports associated with the 2021 CHEVROLET BLAZER out of 109 total complaints (3.7% of complaints involved crashes).
How many fire reports does the 2021 CHEVROLET BLAZER have?
There are 1 fire reports for the 2021 CHEVROLET BLAZER out of 109 total complaints. Fire reports are among the most serious safety concerns tracked by NHTSA.
Are there any deaths reported for the 2021 CHEVROLET BLAZER?
No deaths have been reported in NHTSA complaints for the 2021 CHEVROLET BLAZER.
How many injuries are reported for the 2021 CHEVROLET BLAZER?
3 injuries have been reported in NHTSA complaints for the 2021 CHEVROLET BLAZER. These are self-reported by vehicle owners as part of their safety complaints.
Should I buy a 2021 CHEVROLET BLAZER?
Based on NHTSA data, the 2021 CHEVROLET BLAZER is acceptable with caveats. It has 109 complaints, 1 recalls, and a excellent (5/5) safety rating. Always have a pre-purchase inspection done by a qualified mechanic.
What components fail most on the 2021 CHEVROLET BLAZER?
The components with the most failures on the 2021 CHEVROLET BLAZER are: 1. SERVICE BRAKES (13 complaints), 2. ELECTRICAL SYSTEM (12 complaints), 3. ENGINE (10 complaints), 4. FUEL/PROPULSION SYSTEM (7 complaints), 5. POWER TRAIN (6 complaints). SERVICE BRAKES is the single most-reported problem area with 13 complaints.
What should I know before buying a 2021 CHEVROLET BLAZER?
Be cautious of coolant and radiator failures, as they can lead to engine and power steering issues. Regular maintenance is crucial. The 2021 CHEVROLET BLAZER has 109 NHTSA complaints and 1 recalls on record. NHTSA rates it excellent (5/5).
How reliable is the 2021 CHEVROLET BLAZER?
The 2021 CHEVROLET BLAZER receives a reliability score of 5/100, indicating below-average reliability. This is based on 109 owner complaints, 1 recalls, and 5 crash/fire reports in the NHTSA database. Key known issues include Coolant and radiator failures and Throttle body failure.
What are the known issues with the 2021 CHEVROLET BLAZER?
Known issues with the 2021 CHEVROLET BLAZER include: Coolant and radiator failures, Throttle body failure, Electrical system issues, Thermostat malfunction. These are based on patterns found across 109 NHTSA complaints. 1 of these patterns resulted in formal recalls.
What are the most common issues with the 2021 Chevrolet Blazer?
Coolant and radiator failures, electrical system malfunctions, and throttle body and thermostat issues are the most common.
Are there any recalls for the 2021 Chevrolet Blazer?
Yes, there is a recall for seat belts in certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra models.
What should I do if I experience coolant or radiator issues?
Have the vehicle inspected by a professional to prevent further engine damage.
Buyer Advice
Our recommendation: Be cautious of coolant and radiator failures, as they can lead to engine and power steering issues. Regular maintenance is crucial.
NHTSA Data Summary for 2021 Chevrolet Blazer
This safety report is based on a comprehensive analysis of data from the National Highway Traffic Safety Administration (NHTSA) for the 2021 Chevrolet Blazer. The data includes 109 consumer complaints filed by vehicle owners, 1 manufacturer-initiated safety recalls, 4 reported crashes, 1 fire incidents, 3 reported injuries, and safety rating assessments associated with this vehicle.
The NHTSA has assigned the 2021 Chevrolet Blazer an overall safety rating of 5 out of 5 stars, with a frontal crash rating of 5 stars, a side crash rating of 5 stars, and a rollover rating of 4 stars. These ratings are determined through controlled crash testing conducted by the NHTSA.
All data presented in this report is sourced from public NHTSA databases. Our AI analysis identifies patterns across complaint narratives, correlates them with recall history, and produces the safety assessment above. This analysis is updated as new complaints and recalls are filed with the NHTSA.
Consumers are encouraged to report vehicle safety problems to the NHTSA at nhtsa.gov. If your vehicle is subject to a recall, contact your dealer to schedule the free repair.
Disclaimer: This analysis is AI-generated from NHTSA public data and does not constitute professional automotive or safety advice. Always verify recall status at NHTSA.gov and consult a qualified mechanic.
Analysis last updated: 2026-05-14