Electrical System Problems of Chevrolet Blazer - part 1

Was driving on highway and parking break light flashed on - break was not on. Tried to turn off and couldn't - car still driving. Then all these alerts started coming up "break failure", "no awd" "break failure cannot accelerate past certain speed". I tried to pull over the stop the car and no breaks would work including parking break. Eventually rolled to a stop without hitting anything. Car under warranty with 11,000 miles, called dealership who had lack of concern for urgency of the issue. This put not only myself and child but also many other drivers on the highway during rush hour. Very concerning and lack of response from dealership even more concerning.

See all problems of the 2025 Chevrolet Blazer 🔎.

I am reporting a severe powertrain safety hazard involving my 2022 Chevrolet Blazer at approximately 69,000 miles. The vehicle's 9-speed transmission is experiencing a critical internal hydraulic failure that causes unpredictable and violent lurching. Specifically, there is a severe delayed engagement when shifting into reverse. The engine revs without moving until the hydraulic pressure suddenly spikes, causing the vehicle to violently slam backwards and catch the gear. Furthermore, the transmission exhibits harsh and slipping shifts while driving forward, specifically violently jerking during the 2nd-to-3rd gear upshift. ?these exact symptoms align with widely documented hydraulic control and valve body defects in the gm 9t50/9t65 transmissions, which are known to cause harsh shifts, delayed engagement, and flaring between gears. Concurrent with these transmission failures, the abs warning light illuminated. An independent shop misdiagnosed the severe drivability issue as a standard abs fault, while a local Chevrolet dealership denied goodwill assistance despite this being a premature internal transmission failure. ?this creates a severe safety hazard. The unpredictable lurching in reverse endangers pedestrians and other vehicles in parking lots. Additionally, the violent shifting at speed creates a high risk of sudden internal component failure and a complete loss of propulsion while driving in active traffic.

See all problems of the 2022 Chevrolet Blazer 🔎.

This happened back in may and the dealership couldn’t find anything wrong and it happened again today. I am driving and the car will shut off. A message pops up saying shift to neutral and press start again. It’s very dangerous and frustrating.

See all problems of the 2020 Chevrolet Blazer 🔎.

The contact owns a 2022 Chevrolet Blazer. The contact stated that after the dealer had performed a software update under TSB number: n212355740, the computer blew up. The contact was informed of the failure, provided a loaner vehicle, and advised that the manufacturer was notified of the failure by phone. The dealer was awaiting a callback from the manufacturer before performing further repairs. The contact expressed concerns and dissatisfaction that the dealer had recently confirmed the vehicle was covered under the TSB, but the manufacturer had failed to send a notification of the TSB. The failure mileage was approximately 12,000.

The contact owns a 2020 Chevrolet Blazer. The contact stated that while starting the vehicle, the brake pedal became inoperable. There was no warning light illuminated. The contact stated that excessive force was needed to depress the brake pedal to engage the start/stop function to start the vehicle. The dealer was not contacted. The manufacturer was made aware of the failure by telephone.

What component or system failed or malfunctioned, and is it available for inspection upon request? on September 12, 2026, while parked at the top level of a parking garage, the vehicle unexpectedly began rolling forward after being parked and exited. The vehicle subsequently struck a concrete wall. The vehicle is available for inspection upon request. How was your safety or the safety of others put at risk? on September 12, 2026, my son parked the vehicle on the top level of a parking garage. He exited the vehicle while I remained seated in the rear seat and his girlfriend remained in the front passenger seat. I later moved to the driver's seat to speak with her. As I exited the vehicle to meet my son, the vehicle unexpectedly started rolling forward on its own. Nothing was touched or intentionally activated prior to the vehicle moving. Because the vehicle began moving while I was exiting, I fell and suffered injuries including a scraped knee, swelling and injury to my foot, pain in my hands, and abrasions on my arm. The vehicle continued rolling and struck a concrete wall, causing damage to the front of the vehicle. The unexpected vehicle movement placed me, the passenger, and other nearby individuals at risk of serious injury. Has the problem been reproduced or confirmed by a dealer or independent service center? I am reporting these incidents for investigation. The vehicle is available for inspection by Chevrolet, the dealer, NHTSA investigators, insurance representatives, or other authorized parties. No warning lamps, messages, or other alerts were observed prior to the rear automatic braking events or the vehicle roll-away incident. The braking events and vehicle movement occurred unexpectedly and without warning. I no longer feel safe operating this vehicle. Between the multiple false activations of the rear automatic braking system and the incident on September 12, 2026, where the vehicle unexpectedly rolled forward and caused injury.

Vehicle: 2020 Chevrolet Blazer v6 system: electronic transmission range select (etrs) – gear shifter / park engagement concern type: potential unintended vehicle motion / failure to confirm park state description of the issue on the 2020 Chevrolet Blazer v6, the electronic transmission range select (etrs) system fails to confirm that the transmission is in park, even when the physical gear shifter lever is placed in the park position. As a result the dashboard displays a "shift to park" warning message in the driver information center (dic). The vehicle continues to beep after the ignition is turned off. The vehicle does not fully power down, remaining in accessory/on mode because the etrs system has not received a valid park confirmation signal from the shifter position sensor. This issue presents a potential unintended vehicle motion (uvm) hazard for the following reasons: 1. Vehicle may not be secured in park the "shift to park" message indicates the etrs system does not confirm the transmission is in the park state. If the park pawl has not fully engaged — even though the shifter appears to be in park — the vehicle is not mechanically secured. On any inclined surface, this creates a risk of the vehicle rolling away, potentially injuring the driver, bystanders, or causing property damage. 2. Driver may exit vehicle believing it is secured the persistent beeping and dic warning are intended to alert the driver that the vehicle is not in park. However, customers may not understand the warning, may dismiss it, or may exit the vehicle assuming the shifter position is sufficient. This is a known human factors risk — the driver's perception of being in park does not match the system's inability to confirm park engagement. Vehicle cannot be powered off normally: when the system cannot confirm park, the vehicle remains in an active power state. This means the vehicle's propulsion system is not fully disabled, increasing the risk of unintended movement if the driver exit.

Car is in park but the car alerts that it is not in park ( causing radio and light s to stay on ) - happens continually and from what I have heard from other people and mechanics - this is a known issue with chevy.

The contact owns a 2021 Chevrolet Blazer. The contact stated that while driving 40 mph, the vehicle stalled and was unable to be restarted. The vehicle was towed to the residence. The husband was a mechanic and discovered the 350-amp fuse failure. The fuse was replaced, and the vehicle was repaired. The dealer was not contacted. The manufacturer was made aware of the failure by phone. The failure mileage was approximately 68,400.

See all problems of the 2021 Chevrolet Blazer 🔎.

"steering assist is reduced, drive with care" showed up on the dashboard. The temperature gauge dropped to dead cold. Once the car was parked and cut off, the fan still kept running for 5 minutes. From my research it seems these are the signs of a thermostat being stuck open. It also seems this is a very common problem with this car, according to the internet. This vehicle has around 70k miles. There were no other issues prior to this failure.

My 2022 Chevrolet Blazer abruptly shut down all power for about five seconds while I was stopped at a red light. The vehicle restarted after I pressed the push-button ignition, but the dashboard displayed a brake system error warning with no explanation of the cause or instructions for next steps. No other warning lights preceded the shutdown. The vehicle appeared to resume normal operation after restart, but the brake system warning remained. This appears consistent with complaints filed by other 2022 Blazer owners describing simultaneous electrical and brake system failures.

The car is not sensing that it is in park when it is. When I place it in park and turn the car off it dings and says shift into park however it already is in park. Therefore the car will not turn off. I had to jiggle the shift or turn the car on, reverse then go forward then park to get it to register. This has taken up to 10 minutes and it’s getting worse. This is a known issue that is referenced in gm technical service bulletin 19-na-206.

"I am the owner of a 2023 Chevrolet Blazer rs. The digital odometer and speedometer screen intermittently crashes and goes completely black for 15 to 20 seconds while the vehicle is in motion on public roads. This creates an immediate safety hazard as I am left with zero knowledge of my current speed. General motors has acknowledged this specific software stability bug under technical service bulletin 22-na-023 but refuses to fix the issue due to the vehicle being 9 days past its 3-year calendar warranty, despite having only 32,400 miles. " I contacted your gm agent @ 800-222-1020 and was told its out of warranty sorry, that is horrible service espeacially for a safety issue and a 55,000 vechicle that only has 32,400 miles.

See all problems of the 2023 Chevrolet Blazer 🔎.

My infotainment system has completely blacked out. I have no navigation, no rear view camera or warning signals. I have no phone and no sos ?? emergency calls. I have no music no lane merging alerts. My charging station does not work in the front of the vehicle.

Intermittent electrical defects are beginning to occur that impact the power steering or power brakes. After starting the vehicle, there are times either the power steering or the power brakes do not function. When the braking defect occurs, the engine warning lamp is displayed and indicates brake system control module. Sudden switch to manual steering or manual braking are a safety hazard. A couple ignition recycles eventually corrects the electrical defect and restores the vehicle to normal operations. Vehicle has been dropped off at dealership for warranty repair.

The thermometer and thermometer sensor are glitching . The engine temp needle will not rise at all, the engine fan will run the whole time driving and then when it is turned off will run for 10 min . Right before this happens a notice shows the guided steering is being limited. I disconnected the battery and it reset , I drove and there were no issues , next time I started my car the engine temp needle stayed down and the van started again. This car has 36k miles on it. I just bought it 2 days before it started happening.

The main instrument cluster where the speedometer and fuel gauge etc etc reside went blank during operation of the vehicle. I wasn't able to pull over safely until my destination was reached. Restarting the car seemed to "solve" the issue.

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.

Complete and total failure of the telematics module resulting in loss of self driving, onstar, wifi, gps, and all connected services. Severe battery drain due to module forcing the vehicle to completely shut down while driving, resulting in loss of power steering and brakes.

Shift to park sensor shift to park warning. It was reported to dealer.

See all problems of the 2019 Chevrolet Blazer 🔎.

The contact owns a 2020 Chevrolet Blazer. The contact stated that while driving approximately 70 mph, the message, "steering assist reduced - drive carefully” was displayed. The contact stated that the a/c shut off and the windshield defroster failed after the message was displayed. The vehicle was taken to the dealer, and the contact was informed that the repair was not covered. The manufacturer was informed of the failure and confirmed that the vehicle was not included in the “special coverage" for the repair. The contact was referred to the NHTSA hotline to report the failure. The failure mileage was approximately 65,000.

Brought my car to Chevrolet center in winter haven florida because I had 2 diagnostic codes show up with a check engine light, the codes were (u1345: indicates a communication fault on the lin (local interconnect network) bus, usually tied to modules like the active grille shutters, cooling fans, or charge air cooler (cac) pump. U0632: indicates lost communication specifically with cooling fan 1. ) the dealership told me they didn't find any codes in the system and they tried to charge me $165 for a diagnostic fee. Right after I left the dealership I was having the same codes pop up, with the check engine light and my car was overheating. Chevrolets ecm/pcm warranty is 8 years or 80,000 miles.

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.

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).

Lost coolant temp so replaced sensor with one from auto zone and worked for one then pegged to cold again fan runs 100% so went and bought another coolant temp sensor from Chevrolet installed that worked two pegged back to cold again fan 100% now going to pay $700. 00 dollars to remove the two sensor wires for the harness all the two the ecm heard with it being wrapped in the coil wires it gets electromagnetic static due to degradation of wires. Also radiator started leaking after couple years but they want $3100. 00 dollars for that. Was told extended warranty ran out three days before they discovered radiator leak.

The telematics module failed and is on backorder. This is a known issue across the u. S. This makes it so onstar doesn't work and I am paying for it. Not just that the safety concern of it not working. Gps, maps, level 3 Tesla doesn't work. Car is really not usable as we can't charge on a level 3 when going over 100 miles. We have loss access to navigation, google built-in services, the mychevrolet apps, and even core safety and convenience features tied to connectivity, including onstar and super cruise.

The contact owns a 2024 Chevrolet Blazer. The contact stated that while driving 20 mph with 100 miles of charge, the vehicle stalled and shut off. The screen was black, unresponsive, and failed to start. The vehicle was towed to the local dealer, where it was diagnosed with a power module failure. The part was on back order. The electric module was previously replaced. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was 10,381.

See all problems of the 2024 Chevrolet Blazer 🔎.

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.

Once I turn the vehicle off, there is a loud sound coming from the engine area that sounds like a fan. Then the first incident of the fan ongoing after the vehicle was powered off, a battery light was on the internal driver dashboard and stayed on. The battery was recently replaced during 2026 so the battery should not be anywhere near dead, dying, or needing to be checked.

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.

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.

Driver information centre (dic) and infotainment go dark. This has happened twice now over the last 2 months. While driving suddenly the infotainment goes blank and loses the radio and then the dic follows by going blank (dark). So I was left with no speed indication. The car drives normally during that time. After 30 seconds to a minute the screens come back on as if it rebooted while driving.

2019 chevy Blazer. Car would not turn off the electrical components when parked. Put car in park and walked away and there is a warning note that says, "shift to park. " but the car was in park. Called chevy and they know about the issue on the 2019-2023 vehicles. They sent me the technical service bulletin. Back in 2020, the car had the shifting harness and button replaced and we just had to have it replaced again because it is a consistent issue with the vehicle. Except this time, the dealer charged us $668. 40 to fix it! it is a known issue by the company and they sent me the service bulletin to get it fixed. It should have been covered by chevy, or, at least a recall should be instituted. The power to the car wouldn't shut off. We were able to jump the car to get it started again.

Just took my car to the chevy dealership today and had them go over the car because I keep getting the message steering assist has been reduced and the fan is constantly running at the highest speed and it also makes it where I can not use the a/c or heat in the car! I don’t know the code off hand but it has something to do with the cam shaft and the thermostat for the antifreeze! from what chevy told me today it is a $9000 job to tear down the left side of the engine because the camshaft carrier gasket is leaking oil! which is probably why that code is popping up. Or from what I was told today it could be from the battery which I believe they were trying to shift blame. Either way this camshaft stuff really needs to be investigated!!.

The vehicle has turned off twice while driving. Endangering the safety of everyone in the vehicle.