Chevrolet Blazer Complaints (2020)

224 consumer complaints on file.

#11658799May 4, 2025
ENGINE
Failure of either coolant temperature sensor or thermostat or both. The A/C is disabled, the temperature gauge does not function, and a message appears on the dash display regarding steering assist not working. With all these issues, it’s impossible to feel safe driving any distances, not knowing whether the vehicle will overheat and damage the engine or other components, or if the steering will actually fail. Both parts have been replaced, at the time, May 4, 2025.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11658305May 1, 2025
ENGINE
The thermostat has failed, causing hot air to blow into the car. This is a known and common issue with the 2020 Blazer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657766April 30, 2025
ELECTRICAL SYSTEM, POWER TRAIN, UNKNOWN OR OTHER
In March 2025 a Steering assist reduced warning came on briefly. Over the next several weeks intermittent. April 2025 Engine warning light came on. 4-14-25 Went to ToddWenzel Chevrolet for diagnosis to be told the Thermostat needs to be changed and due to a small amount of crystallization on the radiator that as well. I had just had oil changed and fluid levels topped off that morning at Parkway express who did not identify concerns. 4-15-25 brought to Parker Brake who diagnosed and identified there was a glitch that prompted the warning and they can tell that fired when not driving, temp 125Degrees. "it may have been parked cooling down". They noted not need for additional service. Thermostat fine and no evidence of radiator leak. They cleared codes/engine warning. After about a week experiencing intermittent assist reduced warning again. I am understanding that this is a known problem w/ these Blazers and changing thermostat for many does not work. Where does this leave me? GM needs to help with the cost and figuring this out. I am concerned about sudden failure of something while driving that could be unsafe for myself/others.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657503April 29, 2025
POWER TRAIN, ENGINE, ELECTRICAL SYSTEM
To whom it may concern, I purchased a new 2020 Chevy Blazer from the dealership five years ago. Since then I have had to replace my battery twice, radiator and now the thermostat all of which have been done at the dealership. The car and all receipts of the repairs are available for inspection if requested. This most recent mechanical issue with the thermostat included the following; fans blowing on high, no AC, check engine light, steering assist reduced message, and temp gauge on C. The car was immediately (same day) taken to the dealership for investigation. Upon inspecting the car the mechanic found the thermostat sticking open and indicated that it would need to be replaced as it was unsafe to drive. A total cost of $1400. It seemed odd that my car is only 5 years old with 75k miles and needing to have the thermostat replaced so I started researching this issue further. I found several complaints on the www.chevyblazer.org forum from other 2020 Chevy Blazer owners with the same mechanical issue. There is one comment on the forum from a mechanic stating that this issue is caused by a faulty wire harness and will continue to cause similar issues until the wiring is fixed. You can find those comments in the forum on www.chevyblazer.org This continues to be an ongoing issue with this make and model of Blazer with no consistent fix from the dealer. I believe my previous battery and radiator issues are all related. I am reaching out to you for assistance and/or guidance to help get this mechanical issue reported as a recall by the dealer and properly fixed at dealer cost. I am happy to provide any additional support you may need to research this further. Thank you in advance.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656880April 25, 2025
UNKNOWN OR OTHER
Blazer was brand new purchase, I have experienced the following issues so far (several issues appear to be common based on internet searches): 1. Oil pan replaced 4 years 2. Thermostat replaced around same time, this impacted steering 3. Today I replaced a transmission seal for $600, looks like a recall was issued on bolts, my vin was not in population 4. At todays appointment was told the radiator is leaking and I will need a new radiator.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11655987April 22, 2025
ELECTRICAL SYSTEM
Thermostat failure. No a/c, no power steering, engine light on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11655685April 20, 2025
ENGINE
Engine fan stuck on high, air conditioner does not work, temperature gauge stuck on cold, driving assist warning light on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11655693April 20, 2025
ELECTRICAL SYSTEM, POWER TRAIN, STEERING
Coolant temperature would not read, steering assist malfunctioning, air conditioner intermittent. Wiring harness for sensors loomed together with coil pack wiring interrupting signals.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11655633April 19, 2025
ENGINE
I have had to replace the radiator 3 times since I've owned this vehicle. I see where there are others with the same issue. Now I have to replace the thermostat my first radiator was replaced at 16k miles. This is a safety issue because my car over heated and broke down on the highway left me stranded
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11655309April 17, 2025
UNKNOWN OR OTHER
At 41,024 the AC comoressor locked up. Took it to a repair shop. Then a year later the "steering assist light" came on. Took it to repair shop. Couldnt duplicate because it would start woring again. Had heat sensor replaced. That worked for a bit. Then it did it again. Replaced thermostate. That worked for a little bit. Then the Overheated light came on. Told me to shut the car down. (I had only drove 1/2 mile. Get out....nothing! No leaks coolant good. Had it towed to a shop And just had the thermostat changed again! Im not going to find out what happens next. I got ine more patment in tgis thing and Im trading it in. Its not a trustworthing vehicle for a single lady. Never buying a chevy again. I cannot wait to get it off my hands! 2 years everything started having issues.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11651530March 29, 2025
POWER TRAIN
Check engine light came on, gave error code P0128
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11651005March 27, 2025
ELECTRICAL SYSTEM, STEERING, UNKNOWN OR OTHER
COMMON ISSUE, The steering assist is reduced and temp gauge is stuck on C. This either a thermostat or temp sensor issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11648911March 18, 2025
POWER TRAIN
When putting the car in park the car don’t recognize it’s in park cause the car to stay running.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11648616March 16, 2025
ENGINE
Chronic code P0128, causes cooling fans to go on high, AC doesn't work and steering assist reduced. GM calls for the thermostat to be replaced, at the cost of $1400 at my local Chevrolet dealer. Worked fine for two months then code and issues come back. Online forums are full of people with the same problem. Clearly there is an issue with these vehicles with the 3.6l motor.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11647903March 12, 2025
POWER TRAIN
Cooling ran would never shut off, 'Steering Assist Reduced Drive with Care', the smell of sweet syrup (coolant), and the temp gauge would not leave 'C'. All of this happened at once. Brought it in as it was subsequently throwing codes. Chevy Heiderbrecht dealership said that the radiator seal at 53k is completely eroded away and needs to be replaced. They said this is a very common issue with these cars (2020 Blazer/Original Owner), and looking online there is a plethora of people with the exact same issue (low mileage, complete radiator replacement due to seal going bad on upper driver side). This is insane, you spend 40k on a car, maintain it well, and the parts fail this prematurely with no available recall? Now I am stuck with an $1,800 bill with no legal recourse? I mean the dealership said it is a widely known issue, and GM has admitted that the seal is bad, but there's no consumer protection from this big of a company? Only thing covered under powertrain warranty is the thermostat (wow thanks GM!) Thanks for any help you can provide.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11647514March 10, 2025
POWER TRAIN, ELECTRICAL SYSTEM, UNKNOWN OR OTHER
On Saturday, March 8, 2025 I was crossing a busy intersection when my car shut off completely and accelerated into oncoming traffic almost causing a collision or fatality. My brakes locked and steering wheel locked. I had to put the emergency brake on in order for the car to come to a stop. We got out of the car in the middle of the street and ran for safety. Scariest experience I’ve ever been in especially with my family in the car!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11647032March 7, 2025
ENGINE, POWER TRAIN, LANE DEPARTURE: ASSIST
Continues "reduced steering assistance', thermostat won't register, stay on Cold, a/c blows warm air. We added coolant, replaced battery. Code goes off, within a few weeks comes back on. About to replace the whole thermostat and sensor. Many many blazers having the same issues.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11646852March 6, 2025
POWER TRAIN
The contact owns a 2020 Chevrolet Blazer. The contact stated while attempting to shift to park, the engine remained running, and the message "Shift to Park" was displayed. A mechanic was called to diagnose the vehicle, and the contact was informed that the transmission control, shifter harness, inline shifter wiring harness jumper, park switch, and other related components were faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 77,340.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11643912February 20, 2025
UNKNOWN OR OTHER
“Shift to Park”message appears when I shift to park and turn car off.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11642269February 12, 2025
POWER TRAIN, STEERING
At around 55,000 miles my Blazer began to show error codes for “Steering Assist Reduced” and “ESC”. After 60,000 it began to intermittently populate the Check Engine Light paired with the "Steering Assist Reduced" message. Then, the engine fan would turn on high, auto-start when breaking would disable, and the steering would become more stiff. Finally, I was able to get a scan on the code and found out that it was my thermostat. After taking it to my local Chevy dealer I was quoted $1100 to repair. When I called my local mechanic I was told they could fix it for cheaper, but they were unable to find an OEM thermostat in stock which usually means there's a widespread issue with that part. Upon further research, I've found a plethora of complaints online where others with Chevy vehicles are experiencing the same issue. This causes: -Greater fuel consumption -Risk for the engine to overheat -Stiffened steering which could cause accidents
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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