Chevrolet Blazer Complaints (2020)

224 consumer complaints on file.

#11743407June 11, 2026
STEERING, UNKNOWN OR OTHER
Engine temp gauge stops working causing the air to stop working and the cooling fan to rev to highest rpm. Also a warning that the steering assist is reduced. Eng check light comes on with a code P0208. This a known problem with an extended service # (N242484760) but only if your vin is listed. All vehicles with this problem should be covered. This seem to be a common problem, as my co-worker is having the same issue. This should be a recall as the steering is affected.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743467June 11, 2026
POWER TRAIN
I am submitting this complaint regarding my 2020 Chevrolet Blazer and what appears to be a widespread cooling system defect. My vehicle has developed a coolant smell outside the vehicle, which raises concerns about a coolant leak from the radiator. After researching the issue, I discovered that numerous Chevrolet Blazer owners have reported similar coolant-related problems, including radiator failures, coolant leaks, and persistent coolant odors. These complaints are widely discussed across online forums, social media, and owner groups. General Motors appears to be aware of this recurring issue, yet many owners continue to experience failures within and outside of warranty coverage. The coolant smell is concerning because it may indicate a leak within the cooling system, which could lead to overheating, engine damage, loss of vehicle reliability, and potential safety risks while driving. Owners should not be experiencing major cooling system failures on relatively modern vehicles. I request that NHTSA investigate the cooling system and radiator issues affecting the 2020 Chevrolet Blazer and determine whether a defect exists that warrants a recall or other corrective action. The number of similar complaints suggests this may be a systemic issue rather than isolated incidents. General Motors should be held accountable for addressing this widespread problem and providing a permanent repair solution for affected owners. Thank you for your attention to this matter.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742353June 5, 2026
ENGINE, FORWARD COLLISION AVOIDANCE: WARNINGS
Engine temp gauge bottoms out because the thermostat is stuck open, causing the air to stop working. Also a warning that the steering assist is reduced. Eng check light comes on with a code P0208. This a known problem with an extended service # (N242484760) but only if your vin is listed. All vehicles with this problem should be covered
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741925June 3, 2026
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
This is what came up on my screen.Steering wheel assist reduced.Drive with care. My hot and cold gauge drop to C and stayed there for about 4 days and my a/c was blowing out hot air. I was told a lot of these Suvs have done this.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740743May 28, 2026
UNKNOWN OR OTHER
The radiator in these cars constantly fails. This can lead to major engine issues. Multiple Chevy owners have reported defects
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740390May 27, 2026
POWER TRAIN, ENGINE
Engine temp gauge stops working causing the air to stop working and the cooling fan to rev to highest rpm. Also a warning that the steering assist is reduced. Eng check light comes on with a code P0208. This a known problem with an extended service # (N242484760) but only if your vin is listed. All vehicles with this problem should be covered
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740105May 26, 2026
UNKNOWN OR OTHER
Variable Valve Timing (VVT) exhaust Solenoid engine light has been coming on and turning off immediately for a few months, finally found the issue. $665 replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740247May 26, 2026
STEERING, UNKNOWN OR OTHER
The temperature gauge does not work, it stays at cold. The heater does not work unless the car is moving. AC does not blow cold air at all. I get a message that says “steering assist is reduced. Drive with care”. There are a lot of people online with the same complaints on these vehicles
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739711May 23, 2026
ENGINE, STEERING
P0128CODE P0024 CODE SECOND Cam Shaft sensor failure Thermostat failure, stuck open Electrical issues from low battery power Failure to shift to park when shutting off vehicle
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738523May 18, 2026
ENGINE
Thermostat stuck open radiator broke. Told by 4 GM Dealerships, this is a very common problem in a GM 3.6L V6. GM even claims it's common in its Tech Advisements. The "Stuck Open" Glitch (P0128 Code)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738607May 18, 2026
ENGINE, STEERING
P0128 code produced when scanned. Cooling fans on high. No ac. Steering Assist Warning. Had to replace the thermostat. ECM also replaced and caused the tire pressure sensors to fail and had to replace the tire sensors. There is a recall on models 2021 to 2025 but none on the 2020 for the thermostat. I have paid $3500.00 to have my vehicle fixed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738394May 17, 2026
ENGINE
Car is overheating with multiple engine codes. Unable to drive. Car power is reduced and shortly after will start overheating.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738429May 17, 2026
SERVICE BRAKES, ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Vehicle: 2020 Chevrolet Blazer Issue: “Shift to Park” malfunction Description: The vehicle repeatedly displays a “Shift to Park” warning message even when the gear selector is fully placed in Park. Because of this issue, the vehicle does not always shut off properly and may continue running electrical systems after the engine is turned off. Symptoms include: * Warning message stating “Shift to Park” * Vehicle not recognizing that it is in Park * Difficulty shutting vehicle off completely * Doors/horn behavior acting abnormally after exiting vehicle * Concern about battery drain and vehicle safety The issue occurs intermittently but has become more frequent over time. The shifter often must be moved multiple times before the warning clears. This appears to be a widespread issue affecting many GM vehicles and may involve a defective shifter assembly or park switch component. I am concerned this defect could: * cause unexpected battery failure, * prevent the vehicle from shutting down properly, * create a safety risk if the vehicle does not correctly recognize Park status
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737156May 11, 2026
STEERING, ELECTRICAL SYSTEM
I am contacting you regarding my 2020 Chevy Blazer with approx $55,580 Miles. the vehicle is experiencing multiple issues consistent with the know thermostat problem reported on many 2020 Blazer, including the P0128 code, cooling fans running at high speed and "steering Assist Reduced" warnings. The Steering wheel has now become hard to turn while driving, creating a serious safety concern for me and my family, I m [XXX] old and yesterday in mother's day) while I was driving on the expressway with my grandchildren in the vehicle, the steering suddenly became very had to turn and I was almost involved in an accident, This situation was extremely alarming and poses a significant safety risk. PLEASE review many complains from owners who have experienced the same dangerous issue involving the "steering assist Reduce- Drive with Care", warning, sudden stiff steering thermostat malfunction, loss of A/C, and overheating symptoms. I urge Chevrolet and the appropriate safety authorities to investigate this issue and take immediate corrective action to avoid loss of human life. 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
#11736372May 7, 2026
ENGINE, SERVICE BRAKES
The check engine light came on with a warning that said "Steering assist reduced drive with care". The temperature gauge went to cold and the air condition quit working.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11735752May 5, 2026
STEERING, ENGINE
Steering assist reduced drive with care display, air conditioning turned off, stop and start disabled, temperature monitor at cold, fan blows hard Why my 2020 model was not covered under the special coverage N252508350 NHTSA ID# 11024390
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11735381May 3, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, EXTERIOR LIGHTING
My car will be running fine but the lights on the AC panel wont work. My car will stop and shut down while driving. Ive taken it in for service and they told me my battery cabels were lose. The second time it happened I got a notification of low battery level and it shut off and will not start. I just replace the battery 2 years ago. The service department tested my battery and said it was fine
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734563April 29, 2026
ELECTRICAL SYSTEM
The temperature gauge on my 2020 Chevrolet Blazer stopped working and remains stuck on “cold” at all times. At the same time, the air conditioning stopped functioning properly and only blows hot air. The vehicle was taken to a repair shop where diagnostics indicated a faulty thermostat sensor. The thermostat sensor was replaced and the issue appeared fixed. However, less than two weeks later, the same problem returned. The temperature gauge again stays on cold permanently, and the AC blows hot air. This appears to be a recurring issue affecting the vehicle’s cooling system and temperature monitoring
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11733563April 24, 2026
STEERING, ENGINE, ELECTRICAL SYSTEM
A/C quit working, "Caution Power steering assist ....working, temperature gauge reading zero ( far left side of gauge. PF62F Code set. Repair shop says very common. $800 To repair due to removal of plenum and other component including water temp sensor and thermostat while your there. $100+. 63k miles on vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731894April 17, 2026
STEERING, ENGINE, ELECTRICAL SYSTEM
2020 Chevy Blazer RS 3.6L V6: having intermittent issues with ‘check engine’ light activating and giving code P0128 - indicating “Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)”. Symptoms include: - Temp gauge drops to reading “C” (cold), - AC blows warm/hot air, - Dash displays message, “Steering Assist is Reduced, Drive with Care”, - Radiator (electric) fans run full speed. It seems that the computer is interpreting the engine coolant temperature sensor drop as a ‘stuck open’ thermostat, thus the indicated code. However, at the same time it also appears to assume a bad coolant temp sensor, and failsafes to disable the AC and set the radiator fans to max to avoid potential overheating. The problem with this is that this can occur after driving for some period that the engine is suitably warm, then I can pull off the road, disconnect the battery for a few minutes, and everything goes back to normal operation. A broken thermostat would not behave this way. * This happened in Mar 2025 - after disconnecting the battery about 5-6 times over about a 1wk period the code cleared and we were able to pass inspection. The issue did not reoccur until about the same time this year. It has been recurring periodically since. * After reading numerous postings on this issue, with numerous different vehicles that have this engine and computer, I have no faith that the dealership will provide a solution other than charging me to replace the thermostat, and ending up with the same problem a few weeks later.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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