Electrical System Problems of Chevrolet Blazer - part 1

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.

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

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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.

Dashboard goes on like a christmas tree (almost all lights turn on abs gas light traction control parking service light) check engine stays on then disappears after a few days. Transmission won’t gear into shifts only stays in one shift.

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Request for recall review – 2021 Chevrolet Blazer steering assist and cooling fan issue hello, I am writing to report a recurring issue with my 2021 Chevrolet Blazer and to request that this concern be reviewed for possible recall or warranty coverage. The vehicle frequently displays an “action required: steering assist is reduced. Drive with care” message while driving. Additionally, after shutting off the vehicle, the engine cooling fan continues to run for up to 20 minutes, as if the vehicle is overheating. This issue has occurred multiple times and raises concerns about potential problems with the steering assist system, cooling system, or electrical sensors. I’ve noticed that other Blazer owners have reported similar experiences online, which suggests this could be a broader issue. Could you please confirm whether there are any existing recalls, technical service bulletins (tsbs), or warranty programs addressing this condition? I would also appreciate guidance on the next steps for inspection or documentation. Vehicle information: year/model: 2021 Chevrolet Blazer.

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Action required "steering assist warning" drive with caution, temp gage reads cold, a/c stops working, engine cooling fan runs on high speed (even after the engine is shut off), pending p2018 code, with no check engine light (cel). Replaced engine coolant temperature (ect) sensor, problem did not go away. Several reviews suggest to replace the thermostat, check fuses for proper insertion, reroute ect wiring, and possibly replace radiator. Most of these repairs can be very expensive. Chevy Blazer forum states that the issue is a out of range detection of ect sensor reading. Gm needs to determine a true solution and stop guessing at owner expense/frustration.

Accelerating without pressing gas pedal and gas pedal won't release with braking. Brakes overheated and this went on 10 minutes before I got it to release the gas pedal so I could safely stop. I almost hit 4 vehicles on the interstate because the gas pedal went to the floor all the sudden.

Left turn signal can activate by itself after right turn. Details: driving and making a right turn with the right turn signal active, after the turn when the signal cancels, the signal sometimes activates the left blink-to-pass feature causing the left signal to blink 3 times. This appears to be because the turn signal arm falls too hard. When turning onto a multi lane road this causes confusion to drivers coming up behind where they think I am moving into the left lane, but I am not. Gm has loaded software to reduce this but it still happens. They replaced my turn signal arm and it still happens (much less often now). I can prevent it from happening by using my finger to dampen the turn signal arm when it cancels by catching it and slowing it down. I stopped using my turn signal completely as it is embarrassing when it does this.

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Check engine light on, message saying "steering assist reduced drive with care", engine temperature gauge not moving from c, and ac not working. I have taken it in to be fixed 3x, and they have fixed it 2/3 times but the message has come back again. It is a big issue in 2019/2020 Blazers according to my research.

Thermostat not working. Causing fan to run as if the vehicle is overheating.

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1. Fuse array has failed, and yes it is available for inspection upon request 2. The car overheats, posing a threat to passengers lives due to having to pull over on the side of the road and being struck by other drivers. 3. Yes it has been confirmed by a dealer/service center. 4. Yes it has been inspected by certified service technicians. 5. Yes, the engine light comes on and the dash says “engine power reduced” and then “vehicle overheating, please pull off the side of the road and turn engine off”. There were no symptoms leading up to the vehicle overheating. This first occurred in April 2025, and occurred again September 6, 2025. When speaking to the dealership, they stated that this is a widespread issue with Chevrolet Blazers and because of how big this issue is, new parts are on back order until middle to end of October. I cannot drive the vehicle to go grocery shopping or bring my daughter to daycare. Because this is a widespread problem, there needs to be a recall issued. Chevrolet installed faulty fuse arrays in their vehicles and this is their fault for this happening at such a large scale.

Shift to park warning comes on when car is in park, car electrical will not shut off until the shifter is shaken or car is turned back on and shifted into gear and back to park, may take several times.

My vehicle lost complete power while I was sitting at red light. The dashboard went completely out and pop back on stating to put the vehicle in park and push the brake to start. After following those instructions the vehicle failed to start and I left disability until onstar notified mpd to assist. While waiting for assistance I was almost hit 3 times. When mpd arrived on the scene they were able to push the vehicle out of traffic. After my vehicle arrived at the shop I was told the power failure was caused by the malfunction of the DC/DC converter output voltage. I see a bulletin was put out but a recall was my made available. I feel this is a major issue due to the vehicle losing power.

This is a report of defective software that could increase the chances of an accident, injury and or death. This vehicle features a built-in garage door remote which is utilized exclusively through the touch screen. However, when the vehicle is in reverse the backup cameras restrict access to the needed menu. After backing up and putting the car in drive there is a delay before the back up camera turns off. This creates a situation in which the driver must wait in the middle of the road after placing the car in drive before being able to close the garage door. In seeking solutions from online forums, some drivers have reported their Blazer evs allow the button to be accessed while others report they do not, so I speculated perhaps I missed a software update, but per the car's ota system, the vehicle's software is current as of the time of this submission. I have recorded a video that I am happy to share , however it exceeds the size limit allowed for uploads in this report.

My windshield is defected with no real time when a replacement can be ordered. . The interior lining is not sealed properly which is causing a buckling effect by drivers and passengers visors. . Rain is getting inside and soaking into the dashboard causing the electrical system on screens to blink in and out finally my brake harness is still on recall and my car has been shifting into park which could cause severe problems if I am on the highway. .

1. The vehicle does not recognize it's in park periodically and will not shut off 2. Thermostat housing and thermostat failure 3. Tint covered chrome on exterior of body peeling off only had the car 3 weeks currently at dealership repairing thermostat out of pocket.

I am currently receiving a shift to park message displayed while my vehicle has been put in park and after I turn the vehicle off. While the message is displayed, the doors will not lock and a bell will not stop dinging, notifying me of the error. I have to start the vehicle, shift into gear, shift into park, and turn off several times before the error disappears. I have an appointment to have the dealer look at it this week.

The well known shift to park issue where the park sensor is off and my vehicle won’t shut off without being able to register it’s in park. Auto garage quoted $600+ to replace the entire shift assembly. There’s a service bulletin out for this issue and the specific 2019 Blazer but no recall.

While driving the vehicle loses power to the instrument panel and gauges and infotainment system. The vehicle remains under power however the driver looses the ability to see how fast the vehicle is moving or any information as the entire dashboard loses power. The safety to both myself and my family as well as other drivers is at risk if I am unable to see how fast I am going or control any equipment in my vehicle. This is a known issue online with many other drivers of the Blazer ev experiencing the same issue with no remedy from the manufacturer.

After the vehicle has been put into parked and attempted to shut off, a message displays “action required shift to park”. Although the vehicle is in parked there is some kind of sensor that is not reading it is in park. Vehicle first started doing this when parked on an incline but frequently happens since the first occurrence. One temporary solution is to shift into different gear or shake the gear shift.

The vehicle has 14,000 miles on it and the fuel pump control module has gone out on it. This happened while away from home and could’ve caused a serious situation if this had happened in a remote area where customer could’ve been stranded or if customer were pulling onto a busy road. Luckily it happened in the parking lot of a store. The vehicle was running fine on the way to the store. When customer came back out to the vehicle it cranked up but then stalled which also left customer in between parking rows, potentially causing an accident. I have the old fuel pump control module readily available for inspection. Customer had an updated version that replaced the original one that was in it. There were no signs or indications that this was going to happen until it did. I know there was a big issue / recall with the modules on silverado and tahoe’s etc. Around the same manufacturing era. For reference- 1/2 tank of fuel, no cel until after it happened, approx. 88° outside, coolant temp near 120°, vehicle battery had good voltage and battery cells are good.

After getting the recall repaired (which I was never informed of and I had the parking brake engage as I was travelling 30 mph causing me to skid down the road) I got the vehicle back and the very next day it was the same issue and the abs and traction control light came on and it began making loud clicking noises every time I would engage the brake.

Warning message indicating steering assist system reduced, engine fan running non-stop, ac blowing hot air, temperature gauge not registering/stuck on cold. Faulty engine temperature sensor and thermostat.

The contact owns a 2020 Chevrolet Blazer. The contact stated that while parking the vehicle and shifting to park(p), the message "shift to park” was displayed. The contact turned off and restarted the vehicle several times and shifted from drive(d) to park(p) several times before the message disappeared. The contact stated that the vehicle was also showing electrical failures. The contact stated that after shifting to park(p) and turning off the vehicle, the contact heard chimes as if the vehicle was still running. There was no warning light illuminated. The contact stated that one morning the vehicle had to be jumpstarted and on another morning the battery was completely drained. The battery was taken to an auto parts store to be checked. The contact was informed that the battery was in good operating condition. The contact stated that the battery was drained again and was replaced. The contact had not taken the vehicle to a local dealer or independent mechanic to be diagnosed or repaired. The manufacturer was informed of the failure and referred the contact to the NHTSA hotline for assistance. The failure mileage was approximately 40,000.

On the way to work my car said “driver assist is stopping drive with care” about 2-3 times. Upon getting out of my car it sounded like my car was still running. I turned it off and on a few times and it still sounded that way. I had to go inside or I would be late so about 20 minutes later I was able to come back and check on it and the noise stopped. It was coming from the hood. Upon googling I figured it was something to do with a faulty temperature gauge which correlated with the signal from the car as well as the sounds. It seemed like this is a very common occurrence for these cars. I called the dealership and they said they fix these everyday and the man knew exactly what was wrong before I could even finish describing it. Unfortunately I don’t know the cost of this and have already had several other things to repair in my home recently so this will be detrimental to my finances if this isn’t covered. On the way home it did it again along with no ac in the 90 degree heat and then the engine light came on. We had to open the hood and leave the garage door open to prevent any possible harm that may do in the garage. This could be very dangerous for me as I drive my car everyday to work and can’t afford to rent a car for several weeks while this one isn’t working. And I’ve only had it for 6 months. Now my husband and I have ti figure out how we are each getting to work with one car until we get this fixed or we borrow a family members car.

Vehicle gear shifter is stiff and difficult to pass from park to drive--the gear shifter gets stuck in neutral often. The entire dash and instrument cluster goes black during driving and will not come back on until hours later even after the vehicle has been turned off and back on. This has caused me to be unable to see my speed, turn signals, fuel gauges or any engine controls. This leaves me unable to operate or control my vehicle. This is a huge safety issue when driving as I am unable to determine my speed or see any of my vehicles controls or warnings. The front passenger seat motor has a horrible vibration and struggles to adjust the seat properly. I have contacted multiple dealerships on multiple occasions regarding these issues and have been told that the extended warranty will not cover any of these issues although I was told it would when I purchased. Chevy has refused to offer assistance with towing the vehicle to a dealership when the cluster stops working and encourages me to drive a vehicle that is not operational. The service manager at one location told me this was a known issue with the vehicle.

At startup, I would receive a message that said, steering assist reduced. There were no check engine lights or warning lights. My air conditioning stopped working, and my temperature gauge on the dash remained at cold. I also noticed the radiator fans were on full blast, continuously. I called the dealer, and they weren't sure what was causing that. I told them I was getting codes #u0401 & p0128. They asked me to clear the codes to see if they returned. I cleared the codes, but they returned immediately on restart of the engine. I'm going to replace the thermostat but I didn't understand the #u0401 code, so did further research. I found 2017 bulletin #17-na-158 which seamed relevent to my issues, and vehicle fitment that confirmed my 2019 chevy Blazer is included. I then came to find that the un-shielded low voltage wires for the coolant temperature sensor are routed through the same harness as high voltage coil wiring. Some of us know that emi will affect low voltage signals. As an hvac system designer, I know that un-shielded low voltage communication wiring cannot run parallel two line voltage power wiring. The effects are not continuous, but definitely reoccurring. I also understand there has not been a recall for this issue which surprises me. I can replace the thermostat even in its difficult position, but I don't feel comfortable in separating the low voltage wiring from the harness. I understand that dealers who are aware of this issue, charge a hefty fee to do so. It's definitely one that I can't afford.

Shift to park message began appearing even after the shifter knob was in park. I cannot turn the vehicle off and it rolled backwards due to the vehicle not recognizing it was in park. This has now cost $700 to repair when its been a known issue with these vehicles for over 6 years and yet they refuse to issue a recall. This is dangerous and disgusting practice for a vehicle manufacturer to avoid keeping their customers safe.