2020 Chevrolet Blazer engine problems

Related recalls

No recalls on file.

What owners say

1. Filed Oct 8, 2026TNEngineSteeringTransmission & Drivetrain

   The thermostat is malfunctioning along with engine temperature coolant sensor. This causes the temperature gauge on the dashboard to be completely disabled and not moving off cold, it disables the air conditioner, makes the engine cooling fan to run extremely high nonstop, and places the vehicle into an unpredictable limp mode or fail safe mode. This was identified as faulty by GM and they have issued a special service bulletin that they will repair it up to a 150,000 miles…

   NHTSA complaint #11769932 · source
2. Filed Oct 1, 2026ILEngine

   The radiator and thermostat on my 2020 Blazer had to be replaced at less than 35,000 miles. It was out of warranty and the Chevy dealer charged me $3,500 to replace them. Internet sources state that this is a common problem with this car. I complained to Chevy corporate and they refunded $1,000. I do not feel this was a fair settlement due to the fact that it is a common problem.

   NHTSA complaint #11768395 · source
3. Filed Sep 14, 2026119,000 miOHEngine

   The contact owns a 2020 Chevrolet Blazer. The contact stated that while operating the vehicle, the check engine warning light intermittently illuminated, and the vehicle hesitated while accelerating. The vehicle was taken to the local dealer to be diagnosed, and the contact was informed that the catalytic converter needed to be replaced. The vehicle was not yet repaired. Additionally, while operating the vehicle, the engine temperature rose to HOT. The vehicle was taken to…

   NHTSA complaint #11764034 · source
4. Filed Jul 10, 2026AKBrakesEngineSteering

   I was driving and steering reduced drive with caution notification and brake assist notification came on and then engine light and the temp gage went to cold and stayed there. My steering stiffened up making it hard to steer. This is a known problem with the Chevy blazers and it had to do with the thermostat needing replaced.

   NHTSA complaint #11749661 · source
5. Filed Jun 23, 2026INElectrical SystemEngine

   The vehicle experiences a constant cooling system failure that appears to be related to the thermostat. Beginning at approximately 40,000 miles, the engine cooling fan started running continuously at high speed whenever the vehicle is operating. At the same time, the air conditioning stopped functioning properly and the vehicle began displaying a warning message indicating that steering assist is unavailable or reduced. The vehicle is available for inspection upon request.…

   NHTSA complaint #11745859 · source
6. Filed Jun 5, 2026ARDriver Assistance & Safety TechEngine

   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

   NHTSA complaint #11742353 · source
7. Filed May 27, 2026MIEngineTransmission & Drivetrain

   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

   NHTSA complaint #11740390 · source
8. Filed May 23, 2026INEngineSteering

   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

   NHTSA complaint #11739711 · source
9. Filed May 18, 2026MSEngineSteering

   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.

   NHTSA complaint #11738607 · source
10. Filed May 18, 2026ILEngine

    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)

    NHTSA complaint #11738523 · source
11. Filed May 17, 2026MIEngine

    Car is overheating with multiple engine codes. Unable to drive. Car power is reduced and shortly after will start overheating.

    NHTSA complaint #11738394 · source
12. Filed May 7, 2026IABrakesEngine

    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.

    NHTSA complaint #11736372 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology