Electrical System Problems of Chevrolet Blazer - part 2

Vehicle has shift to park light and will not turn off even with the shifter in the park position.

See all problems of the 2020 Chevrolet Blazer 🔎.

Electronically controlled thermostat and sensor fail or get stuck at a much lower coolant temperature causing the dash to display the “steering assist is reduced drive with care. ” it isn’t just a message, the steering is much harder to use potentially causing an accident. The ac completely doesn’t work causing potential for sensitive, elderly, or young children and pets to overheat inside, it’s significant risk of injury or death from the hot summer temperatures. The engine coolant temperature gauge is all the way down on c position which isn’t registering how hot/cold the engine gets potentially causing damage to the vehicle and a total loss of the vehicle entirely due to damage from the engine overheating. Gm sent out letters to 2021 Blazer owners which included a special coverage number n252508350 applying to people with this year having this problem and they have until 2036 or 150,009 mi to get the repairs made free of charge, they just bring the document with the special repair codes to the dealer and they fix it free of charge. After doing research online, this problem is affecting all years of the 2019+ Blazers with the 3. 6l v6 engine and other known problems with other models and years of their other lineup of cars, it’s very widespread across their platforms. So what are people supposed to do when it isn’t the 2021 year? pay an $800+ repair bill to gm when they know it’s more widespread than just this year/make? this is a scam. I can’t even do the repair myself because I’m having trouble finding the correct parts online and not only that the repair is extensive, the whole top half of the engine needs to be taken apart just to get to the thermostat, we’re talking the airbox and intake manifold, all the plastic parts and shrouds and sensors covering engine, the fuel rail and injectors, pipes and clamps, engine coolant needs drained and refilled. It’s a major fix. I’m reporting this complaint to raise awareness and hopefully gm will do the right thing.

See all problems of the 2019 Chevrolet Blazer 🔎.

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. This condition creates a safety concern because the steering assist warning indicates a potential reduction or loss of power steering assistance, which could increase steering effort and make the vehicle more difficult to control, particularly during low-speed maneuvers or emergency situations. The warning appears during normal vehicle operation and can distract the driver. The ongoing failure of multiple vehicle systems raises concerns about the safe and reliable operation of the vehicle. The problem has been present continuously since first appearing at approximately 40,000 miles and is fully reproducible. The condition occurs every time the vehicle is driven and has not corrected itself. Symptoms include the engine cooling fan running continuously, loss of air conditioning, and a steering assist warning message. Based on reports from other Chevrolet Blazer owners experiencing similar thermostat-related failures, this may represent a common defect that warrants investigation and consideration for a safety recall.

2020 chevy Blazer rs 3. 6l 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.

On two separate occasions the vehicle lost all power while driving. On December 5, 2025 turning on to a main road from parking lot the vehicle shut off with no prior warning lights. Shifted vehicle to park. No power to anything, unable to unlock doors, unable to turn on hazard flashers, stuck in the middle of the road at night. Waited a minute and pressed the start button and vehicle started with no problem. Again, on February 24 , 2026 making a left turn in intersection, without any warning the vehicle shut off… no power at all. Stuck in middle of road with no lights , no hazard flashers ,unable to get out of the car. Few minutes later vehicle started again. The vehicle did not stall while stopped, it completely lost power while moving. Reported problem to west herr Chevrolet of hamburg NY , brought vehicle in to dealership on February 25, 2026 and they were “unable to duplicate the concerns” the dealership paperwork states that the vehicle stalled while stopped, this vehicle lost all power while it was moving. We now have the vehicle back in our possession but are extremely concerned for our safety and the safety of others.

See all problems of the 2025 Chevrolet Blazer 🔎.

This vehicle experiences multiple recurring safety-critical system failures while driving, creating a dangerous operating condition for both the driver and the public. 1. Dashboard / instrument cluster failure while driving while the vehicle is in motion, the dashboard display intermittently shuts off completely. When this occurs, I cannot see my speed, warning lights, battery status, or any other gauges. This creates a severe safety risk because I am effectively driving without any instrument information. The issue occurs while actively operating the vehicle on public roads. 2. Navigation / gps location failure the vehicle’s built-in mapping system frequently shows my location several states away from my actual position. Even though the location is incorrect, the system continues to provide turn-by-turn navigation instructions based on the incorrect location. If these directions were followed, it could cause a driver to make unsafe maneuvers or become distracted while attempting to correct the navigation error. 3. False automatic emergency braking activation the automatic braking system frequently activates even when there are no vehicles, pedestrians, or obstacles present. The vehicle abruptly slows or brakes on open roads with nothing nearby. This creates a significant safety hazard because it could cause a rear-end collision if another vehicle is following. Repair history / ongoing issue: this vehicle has been taken in for repair multiple times for these issues. Despite attempted repairs, the problems continue to occur. The recurring nature of these failures indicates a systemic defect that has not been corrected. Safety concern: these failures create multiple hazardous driving conditions: loss of dashboard information while driving incorrect navigation location and directions unintended automatic braking events allowing this vehicle to remain in service with these unresolved defects places both the driver and the public at risk. Request: I am requesti.

See all problems of the 2024 Chevrolet Blazer 🔎.

Shift to park issue: known issue where the car fails to recognize it is in park, preventing it from shutting off. Electronics: potential blanked-out display screens, usb port issues, and malfunctioning cameras. Steering assist: restricted, temperature gauge goes to cold and radiator fan blows hard. I have to unplug negative cable to battery and reconnect and everything goes back to normal.

On February 4, 2026, my wife drove to the bank, a trip of about 10 to 15 minutes, and turned off the car at the atm. When she tried to leave, the vehicle wouldn't start. After a while, she opened and closed the door and locked and unlocked the car twice with the remote control, and the vehicle started and she was able to drive, but all the warning lights on the dashboard remained on. It is currently at a Chevrolet dealership for diagnosis.

I received a check engine light which I took to bell tire for diagnosis. Here is there diagnosis comments: the p01f0 code on a 2020 chevy Blazer means the engine coolant temperature is below the normal operating range, often due to a stuck-open thermostat (or both thermostats in models with dual units), a faulty engine coolant temperature (ect) sensor, or low coolant, leading to poor fuel economy and potential wear; fixing it usually involves replacing the thermostat(s) or sensor after checking coolant levels and wiring. After that I took the vehicle to gm dealership. Even though this is a know issue with many vehicles from same year, I was told that my VIN is not part of recall and dealership ended up charging me 600+ to fix the issue. I am reaching out to seek help as I had exact same problem but gm is not covering the repairs because my VIN is not in the recall. How is that possible?.

Action required steering assist reduced and coolant temperature at 0. Air con blowing hot and check engine light on. The vehicle became hard to handle and keep in my lane on the interstate at high speeds. The problem has persisted. It has not been recitfied. I am not driving the car to avoid damage and danger. I bought the Blazer on 1/6/26. The lights and issues began 8 days later. Dealership will not help me. 2020 Blazer rs awd bought from morgan city Toyota louisiana.

Chevy of wasilla, ak did not properly inspect a safety recall for the rear parking brake harness. After I showed the dealership the pictures of the holes in the brake harness, I was told that the holes in the brake harness is a feature to let water out. Pictures are attached of said holes in brake harness and text message with dealership representative.

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 into traffic or crossing intersections. Diagnostic trouble code p2101 (throttle actuator position performance) was present. A Chevrolet dealer confirmed an internal throttle body failure and replaced the throttle body assembly. This component is a critical engine control system, and failure could affect acceleration and vehicle control, posing a potential safety risk. The failure occurred well before expected service life and required a costly repair. The component has been replaced and is available for inspection upon request. I believe this may represent a premature defect and should be investigated for similar failures in other vehicles. ?.

See all problems of the 2021 Chevrolet Blazer 🔎.

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 intersections. Diagnostic code p2101 (throttle actuator position performance) was present. A Chevrolet dealer confirmed an internal throttle body failure and replaced the throttle body assembly. Although the repair was completed, this failure occurred at relatively low mileage for a critical engine control component. A sudden loss of acceleration can pose a safety risk depending on traffic conditions. Since filing my original complaint, I have identified multiple similar reports online and in owner forums describing premature throttle body failures in gm vehicles with similar symptoms (reduced power/limp mode and limited acceleration). This suggests the possibility of a broader pattern involving this component. I am submitting this additional report so that NHTSA has a complete record of the incident and potential pattern of premature throttle body failures. If this issue is widespread, it may warrant further review or investigation as it affects vehicle acceleration and safe operation.

I have found multiple times that the instrument panel (ipc) display and the center infotainment displays have gone dark while driving. This has put me in unsafe driving situations because I am unable to monitor my speed and other important information displayed on the dashboard, or to control critical safety controls such as headlights, and other adas safety controls. Several software updates have been installed by the dealership, but the problem has persisted, suggesting a hardware issue with the radio unit. The manufacture insist it is a software problem and that they are working on a solution. Declining to replace the radio under warranty, additionally, they want me to wait until a new update is released, and in the meantime, my bumper-to-bumper warranty is about to expire. I have found that the radio unit is the main control module for both displays, multiple adas controls, and headlights, and it should be recalled, with the manufacturer extending the warranty or including the radio as a safety feature under the extended powertrain warranty.

The driver information center suddenly indicated steering assist disabled, temperature gauge drops to below cold, air conditioning blows warm air. This issue has happened several times and is able to be reset by disconnecting/reconnecting the battery or using a scan tool. Temperature sensor is not the cause in my opinion, and I have read that the harness for the temperature sensor also includes the coil wires, which can lead to electrical/rf interference, triggering this issue. I have read about many owners having this same issue, even after temperature sensor and thermostat replacement, at low mileages. This should be recalled and handled by gm, whatever the cause.

Telecommunications module failed - no onstar, no navigation which means no help to find charging station, and mychevrolet app remote connection is not functional. Local dealer states this is a known issue but there is a significant backlog to investigate, and no loaner vehicles available. Wide spread issue across many gm vehicles. Very disappointing experience including service repair. Due to lack of loaner I am unable to drop off as this is my primary driven vehicle.

Engine showing po128 code. Steering assist system reduced power. Engine fan constantly running. Engine temp on dash is stuck on the "c" mark, doesn't move. Thermostat and temp sensor replaced, issue continues. This is a very common problem on gm vehicles with the 3. 6l around the 60,000 mile mark. Gm needs to get it figured out.

The contact owns a 2024 Chevrolet Blazer. The contact stated that while driving 30 mph on an icy road, the vehicle swerved out of the intended lane because of an ice patch on the road. The contact lost control of the vehicle, and the vehicle continued to swerve, almost causing a crash. There was no warning light illuminated. The vehicle was taken to a dealer, where the contact was informed that the vehicle needed a 4-wheel alignment. The manufacturer was notified of the failure, and the contact was informed that there were no recalls on the VIN related to the failure. The contact was then referred to the NHTSA hotline to file a complaint. The vehicle was repaired. The failure mileage was approximately 22,000.

My car lost power twice in the middle of heavy traffic we could have gotten killed . I was told it was a battery I bought a battery it happened again . The car goes totally black and it locks you in the vehicle you can’t get out I had to call for help scared to death.

There seems to be a constant problem with the service driver assist error code popping up and check engine light coming on. The ac heating keeps losing temperature. I've looked for support for this issue and it seems to be a common problem for chevy owners. Why isn't there a recall on this.

Charging hatch door will not open. First noticed the problem when it got very cold here. <-15f did not try to pry door open. Hatch needs to be reliable iin all weather. Happened December 13, 2025.

"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.

The shift-to-park sensor in my 2019 chevy Blazer rs is malfunctioning. After shifting into park, the vehicle does not detect that it is in park and displays a “shift to park” message. The issue is/has been ongoing and now it is almost impossible to bypass with wiggling the shifter. Safety risk: the vehicle cannot be fully shut off or locked, increasing the risk of battery drain or unintended movement. This poses a safety risk if the vehicle is left in public or on an incline. Inspection history: the vehicle was taken in to the dealership in November/December 2025 due to multiple warning lights: “shift to park”, "steering assist", "stabilink" and the usb-c charging port under the radio screen will stop working all together when this happens as well. This started around September 2025 and has occurred regularly since.

Telematics control module failure.

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 Blazer .

Car is displaying a “steering assist is reduced drive with caution” engine light is on and fan continues to run for 5-8 minutes after car is turned off. Was told by a mechanic it is a p0128 code, coolant thermostat. This is the third time it has happened in the last year. Other two times the codes cleared.

See all problems of the 2022 Chevrolet Blazer 🔎.

Thermostat gauge isnt moving along side a message saying "steering assis is reduced drive with care".

Incident description: while my wife was driving our 2022 chevy Blazer at approximately 40 miles per hour, the vehicle’s dashboard suddenly went dark and became unresponsive. Multiple warning lights illuminated simultaneously, including the check engine light, abs light, and other system alerts. The dashboard appeared to flicker as though it was repeatedly shutting down and restarting. When the brake pedal was applied, it offered no resistance and traveled completely to the floor without slowing the vehicle. To bring the vehicle to a stop, my wife shifted into neutral and allowed it to coast until it came to a complete stop. Fortunately, there were no intersections or other vehicles in front of her at the time, preventing a potential accident. This incident raises serious safety concerns, as both electrical and braking systems appeared to fail simultaneously.

I got into my vehicle and it said “steering assist reduced. Drive with care”. The a/c stops working and refuses to cool as well as the cooled seats. The thermostat for the coolant reads “c” despite driving it 40+ miles in 83 degree weather. Tried disconnecting battery upon research and finding out many other people are having the same problem. The light turned off and came right back on the following morning.

Shift to park issue. Vehicle shifts into park but does not register as such. Therefore, the vehicle keeps running and will not turn off or allow you to exist the vehicle. This is already a know issue with certain gm vehicles as is evident by a recall and service bulletins. However, none of those include the 2020 chevy Blazer.

Published date: 09/6/2024 preliminary information pit6231 poor sound quality on a phone call gm dealers are not recognizing this service bulletin to remedy the microphone issue. This is a life safety issue and a formal recall notice should be issued. Reason if the driver or passenger is injured in the vehicle the same microphone is used to communicate with the sos and on start. When some one is incapacitated or suffered an injury they would not normally be able to speak in such a loud volume for the recipient to hear and when the person speaking who has been injured is forced to yell into the microphone (if able) the receiving end only will her distorted audio,. It is for the reasons set forth above I respectively ask that this be considered a recall and not addressed by a service bulletin.

Component/system involved: the electric power steering system in my 2020 chevy Blazer is malfunctioning. A warning appears on the dashboard: “steering assist is reduced – drive with care. ” when this happens, steering becomes very stiff and difficult. The issue is ongoing, and the component is available for inspection if requested. Safety risk: this creates a serious safety hazard. The sudden loss of steering assist makes it hard to turn the wheel, especially at low speeds or when maneuvering. It puts me and others at risk, especially if it happens in traffic or while turning. Problem confirmed by dealer: no, the issue has not yet been inspected or confirmed by a dealer or service center. Inspection history: the vehicle has not been inspected by a dealership, manufacturer, police, or insurance. Warning signs: the only warning is the “steering assist is reduced – drive with care” message, which appears randomly—sometimes at startup, sometimes while driving. The issue began around 10/15/2024 and continues to be an on going issue.

When I try to park the car, it says shift to park. Sometimes I can’t get the car to go into park to exit the vehicle or other times. I’ve shut the door and it has stayed on with the accessories because it won’t shut off.

Vehicle thermostat would read cold while operating and the ac was not working. A message would populate in the dash stating "steering assist is reduced drive with care. " multiple forums stated it was a thermostat issue or temperature sensor. Also attempted to disconnect the battery for several minutes which would in turn clear the message and all would be working fine. This has been done multiple times and is at random when the message and ac stop working.

The infotainment system of a brand new 2025 Blazer ev is doing blackouts, flickers, and changing commands and requests. While this may sound trivial - and if this system just did the radio - I would agree. However it controls most all the sub-systems of the car from charging, to display, to gps, environmental, etc. While at home it is just annoying and frustrating - we traveled to va from FL this past week. Traffic was horrendous due to a closure of i95 in SC - all traffic was forced onto 2 lane country roads. Attempting to use the controls, adjust gps for alternatives, and adjusting displays - the glitches were causing either unexpected actions - or distracting longer than expected and causing near accidents. In addition I report that the "collision avoidance" is marginal or dangerous. Dangerous with it engaging maximum braking for a marker-barrel that no where near my path - to not engaging well enough when vehicles were rapidly braking (and they did not have brake lights). Finally - the gps system "changes" destinations on its own. Again with the display flashing and blacking out - it is difficult to notice these "changes" when travelling on back-roads with insanely heavy traffic.