Power Train Problems of Chevrolet Blazer - part 1

The transmission in my 2024 Chevrolet Blazer is very noisy often making whining and grinding sounds and I experience rough shifting and transmission hesitation during acceleration or gear changes.

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Steering assist reduced warning came on with engine light. When car turned off , radiator fan continued running for a few minutes before turning off. Ac would also not work during this time. Issue has been intermittent. Was told the thermostat was getting stuck open and needs replaced.

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Temp sensor quit working. I have seen online there are tons of people having this exact problem but no recalls issued.

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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.

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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.

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Shift to park error in 2019 Chevrolet Blazer. This has affected numerous vehicles that should be issued a recall and not have to pay over $2500. 00 to fix!!.

I am writing to inform the appropriate authorities of the issues that I’ve continually had with my 2023 Chevrolet Blazer. It has come to my attention that the aforementioned vehicle will need a new transmission and possible engine repair currently totaling at just over 6,000 dollars in repair costs. When I was provided with the total repair cost I was informed by the certified service representative that this was a common issue for the Blazer model and that gm was aware of the ongoing issue. I’ve reached out to gm with my concerns regarding this vehicle and the fact that this is an issue that has in prior dates prompted recalls for Blazer models from the year 2020-2024. I have because of the transmission defects/ failures been stranded and unable to shift gears required for proper motion of the car. To which I am sure you can understand the public safety risk of an inoperative transmission. I have taken the car in for service concerning the transmission on 3 separate occasions within the last 10 days and was told by prior service technicians that “ no problems were visible” leading to the total breakdown of the transmission. I reached out to gm and told them of my wish to return the leased vehicle early due to my fears of now driving and operating the car and was told that I was not eligible for a buy back. Gm is maintaining its stance of no liability and I am seeking outside help from this governing agency to ensure that repair costs are fully covered for this defective product.

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On July 31st 2025 my vehicle would not sift out of first gear. I had vehicle towed to kelly Chevrolet in [xxx] . After a failed repair attempt on August 18 2025 have been waiting on back ordered valve body part number 24045659. No eta on this part even though a transmission replacement would resolve but dealer refuses to replace. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

2023: 16k miles, the Chevrolet Blazer in questions transmission went out; thus requiring it to be brought into the dealership for repair; it was "repaired" and given back to us. A few days after said repair, I was driving it with my son in the vehicle, and the transmission went out while on the highway. I was almost hit from behind as I limped it to the side of the road. A brand new transmission was put in. During this time, there was also issues with the brakes where they were making noises. 2025: Blazer check engine light came on. On the way to get it diagnosed, it began to overheat; we were limping it to the side of the road when it stated "engine overheating, vehicle turning off". The safety system for shutting down when overheating worked, however, I was in the roaad again. Thus putting me in danger of being hit. We just received notice from the dealership that it is (as of this moment) a cooling fan, ac pressure switch, thermostat, and a cracked radiator. We are waiting on the technicians to finish checking it to see if there are any other issues.

The contact rented a 2024 Chevrolet Blazer. The contact stated that while driving at undisclosed speeds, the vehicle vibrated and wobbled. There was no warning light illuminated. The contact stated that while driving at undisclosed high speeds, the vehicle vibrated abnormally. The contact stated that the vibration felt like the wheels were detaching from the vehicle, causing the children's car seats to also vibrate. The contact pulled over to the side of the road. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The rental company was notified of the failure, but no assistance was provided. The manufacturer was not made aware of the failure. The failure mileage was 46,831.

The contact owns a 2020 Chevrolet Blazer. The contact stated that while his wife was driving 80 mph, the vehicle failed to accelerate as intended while depressing the accelerator pedal. In addition, the contact stated an abnormal sound could be heard coming from the engine. The vehicle stalled and the contact's wife was unable to move to the side of the road. The message "shift to neutral and press the start button" was displayed. The police assisted with traffic control while the vehicle was pushed to the side of the road. The vehicle failed to start. The contact stated that prior to the most recent failure, the gear shifter would be stuck in park(p). The contact would move the gear shifter several times to cause it to move. The contact stated that the failure recurred several times, and the vehicle responded as needed after several attempts. After several attempts, the check engine light was illuminated. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the nhsta hotline for assistance. The approximate failure mileage was approximately 40,000.

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.

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.

I am experiencing the well known "shift to park message" while the shifter is in park. I cannot turn the vehicle off and I am worried the battery will die. This is a well documented issue with this vehicle, and several other models outlined in TSB 19-na-206, for years and yet they refuse to issue a recall to repair the faulty design or component . I have reached out to them via email, but no action has been taken, see email below. ------------------------------------------------------------------------------------- gm customer care, I am writing to request assistance regarding an issue with my 2020 chevy Blazer VIN# [xxx] . This is my fourth new gm vehicle, and while it is currently outside the 36-month warranty period, the vehicle has only 18,800 miles on it. Recently, the vehicle began displaying a persistent "shift to park" message on the driver information center, despite the gearshift being in the park position. As a result, the vehicle remains in the on position and cannot be turned off. This is a well-documented issue affecting several gm models, including the Blazer, acadia, malibu, traverse, and volt. For reference, please see TSB 19-na-206 attached. Repair costs for this issue appear to vary widely, sometimes exceeding $1,000 depending on location and dealership. Given that this appears to be a known design or component issue, I do not believe this should be an out-of-pocket expense for the customer. As a long-time gm customer, I respectfully request that gm cover the cost of this repair. I am disappointed that there has been no proactive recall or service campaign, especially considering the volume of customer complaints reported online. Thank you for your time and attention. I look forward to your response and hope gm will stand behind its products in this matter. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2020 Chevrolet Blazer. The contact stated upon shifting to park(p) and attempting to turn off the vehicle, the message that the transmission was not in park(p) was displayed. The contact stated that the failure recurred several times, and the vehicle responded as needed after several attempts. The dealer was not notified of the failure. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 38,000.

When you try to turn the vehicle off, there is a “shift to park” warning with the vehicle already in park. The vehicle has only 19,000 miles.

When car is parked and shifted to park massage is sent put car in park. Was a shifter problem dealer fix for 463. 00. 58000 mi. 2020 Blazer.

The engine fan has been running and the check engine light has come on and upon further inspection I discovered that this is a common issue with this vehicle. I have had my vehicle inspected and serviced by Chevrolet since I purchased it and I informed the technician that there was water under my vehicle if it ran idle on several occasions and was told that it was a non issue and now that my vehicle is out of warranty there is an issue with the same thing I have been concerned about.

The contact owns a 2020 Chevrolet Blazer. The contact stated that while attempting to park the vehicle, the shift lever became inoperable. The contact stated that the shift into park message was displayed. The vehicle was taken to the dealer, where it was diagnosed and determined that the shift assembly had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 20,500.

My transmission can accelerate with the cruse control on, transmission also sputters at lower rpm. Lastly my shift to park issue kills the battery.

We have a start / stop issue with our 2019 chevy Blazer . The dashboard states to put into park . We cannot turn car off with this on dashboard . Why is this not a safety recall , because we have seen a lot off people complaining about the same issue . We called the customer service for general motors corporate , and they told us there is no recall for that . We also got a postcard from a lawyer stating there is a settlement this . What are legal options to get this resolved .

The thermostat is getting stuck open and giving me a reduced steering assist error. My safety was put at risk because of the steering assist being reduced. The problem has not been reproduced but there are many issues online about the same model, year, and mileage all having the same issue. The component is going to be inspected by a service manufacturer. There were no warning lamps prior to error.

To whom it may concern, I purchased a new 2020 chevy Blazer from the dealership five years ago. Since then I have had to replace my battery twice, radiator and now the thermostat all of which have been done at the dealership. The car and all receipts of the repairs are available for inspection if requested. This most recent mechanical issue with the thermostat included the following; fans blowing on high, no ac, check engine light, steering assist reduced message, and temp gauge on c. The car was immediately (same day) taken to the dealership for investigation. Upon inspecting the car the mechanic found the thermostat sticking open and indicated that it would need to be replaced as it was unsafe to drive. A total cost of $1400. It seemed odd that my car is only 5 years old with 75k miles and needing to have the thermostat replaced so I started researching this issue further. . Read more...

Coolant temperature would not read, steering assist malfunctioning, air conditioner intermittent. Wiring harness for sensors loomed together with coil pack wiring interrupting signals.

The contact owns a 2023 Chevrolet Blazer. The contact stated while driving at an undisclosed speed, the vehicle shuddered, and the transmission was difficult to shift into gear. There was no warning light illuminated. The vehicle was taken to an independent mechanic and was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The vehicle was taken to the dealer, where the same diagnostic information was provided. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 96,244.

In March 2025 a steering assist reduced warning came on briefly. Over the next several weeks intermittent. April 2025 engine warning light came on. 4-14-25 went to toddwenzel Chevrolet for diagnosis to be told the thermostat needs to be changed and due to a small amount of crystallization on the radiator that as well. I had just had oil changed and fluid levels topped off that morning at parkway express who did not identify concerns. 4-15-25 brought to parker brake who diagnosed and identified there was a glitch that prompted the warning and they can tell that fired when not driving, temp 125degrees. "it may have been parked cooling down". They noted not need for additional service. Thermostat fine and no evidence of radiator leak. They cleared codes/engine warning. After about a week experiencing intermittent assist reduced warning again. I am understanding that this is a known problem w/ these Blazers and changing thermostat for many does not work. Where does this leave me? gm needs to help with the cost and figuring this out. I am concerned about sudden failure of something while driving that could be unsafe for myself/others.

Purchased a brand new 2024 Blazer on [xxx] - 11 miles on the vehicle from friendly Chevrolet in dallas, TX. Transmission failed at 1150 miles in galveston, TX on [xxx]. According to the galveston dealership an extensive transmission repair was performed on the vehicle at 6 miles. According to the gm rep I spoke with, that maintenance was performed as a service bulletin recall. Car was transported to dallas by gm. Parts are on back order. No eta for resolution. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Engine - code p0128 engine coolant thermostat. This is a safety issue because it reduces the power steering on vehicle, auto stop stopped working, unable to remote start vehicle. Issue has been confirmed at an independent service center (I work at an auto collision center). Warning lamp - check engine light. Message on dash - power steering reduced. Appears everything came on at the same time. Per dealership items most likely needing replacement are engine coolant thermostat and engine coolant temperature sensor but ecm module could also need replacement. Advised common problem but no recall power train - transmission shutters when accelerating. Safety is at risk because vehicle will not accelerate or accelerate too quickly. Called to dealership advise flush transmission fluid twice to fix issue. We have done this 4 times in the past year. Shutter temporarily reduces but does not go away. Per service advisor it is a "function design" and if flushing transmission fluid does not fix issue then transmission will need to be replaced. There are no warning lights or messages on dash electrical - vehicle says shift to park when vehicle is in park and will not allow vehicle to turn off. It is a safety issue because vehicle will not shut off. Problem confirmed by an independent service center we have already replaced the in-line wire harness jumper. This did not fix the issue. Advised from service center that entire shifter would need to be replaced.

Driver steering assist reduce message in display. Upon scanning codes, error code p0128 triggered. Temperature gauge does not register on dial between c-h.

Check engine light came on, gave error code p0128.

Steering assist is reduced came on dashboard. Check engine late came on shortly after. Ac wasn't working and the temperature gauge on the dash wouldn't move. I took it into a shop where they said it was a temperature gauge that was causing all the issues and would need to be replaced. P.

Ac not working, temp gauge stuck at c, steering assist reduced happened a year ago, went away, came back. Would fix short term if battery was disconnected and reconnected or if code was cleared. Found lots of others with this same issue.

The contact owns a 2019 Chevrolet Blazer. The contact stated that while attempting to turn off the vehicle on several occasions, the gear shifter was shifted into park(p) but the vehicle failed to recognize that the gear shifter was in park(p). The contact stated that the message "shift to park" was displayed. The contact stated that the vehicle was not able to be turned off and remained in drive(d). The vehicle was taken to a dealer where it was diagnosed that the shift controller sensor needed to be replaced. The vehicle was repaired but the failure reoccurred within two months. The vehicle was then taken to another dealer where it was diagnosed that the shift control sensor needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure. The failure mileage was approximately 40,000.

Consistent Blazer issue. Error coded “steering assist reduced. Please drive with care”. There is a thermostat issue. Causing the car to sputter and not run properly. This a common issue with Blazers and a manufacturer default. Should be recalled and covered. It is a safety issue.

When putting the car in park the car don’t recognize it’s in park cause the car to stay running.