2019 Chevrolet Blazer Electrical Problems

Mileage when the problem started

Owner reports

Selected complaints filed with NHTSA by 2019 Chevrolet Blazer owners, lightly cleaned up (personal details are redacted by NHTSA).

The contact owns a 2019 Chevrolet Blazer. The contact stated that upon driving into a parking space and placing the vehicle into park(P), the vehicle independently accelerated into a building. The air bags deployed upon impact. The contact was treated at the scene by paramedics for minor scrapes and bruises. A police report was filed. The vehicle was towed to an independent collision center for repair. The contact was informed that a couple of bricks on the building were damaged due to the collision. The dealer nor the manufacturer had yet to be notified of the failure. The vehicle had yet to be repaired. The failure mileage was approximately 33,000.

While using my vehicle, twice in one day, my vehicle failed to recognize that it was in park. My 2019 Chevrolet Blazer essentially malfunctioned, and was unable to recognize that it was in park, which left me unable to leave the car to go into my office building. The car was in fact in park, but did not recognize this fact. I tried exiting the vehicle and closing the door, but the car still would not turn off. I was left to essentially babysit my car, while attempting to work the gear shifter back and forth between drive, reverse, and park, until it eventually finally accepted that it was set to park, and allowed me to fully power the car down. If I am unable to have the car recognize that it is in park, I am unable to leave it, as it can be started and driven without the FOB due to the potential safety hazard of the vehicle thinking it is not properly shifted into park. …

I bought a 2019 Chevy Blazer in February 2023 . The vehicle has issues when I fill it with gas. As soon as I gas up to full it starts jerking immediately afterwards. It makes loud popping sounds. The engine dies completely. It starts to tremble and will not go. When I try to turn in back on , the starter works very hard before it will turn back on. It does turn back on eventually but I have to pull over to the side and accelerate the engine until it finally stays on. I drives that way turning off at lights and stops. After about 10-15 minutes of this , it finally stays on long enough to drive another 20 minutes or so to get home. After it rests for a few hours, it goes like normal. This is a big safety concern for me since these episodes happen every week when I fill up my car with gas. …

1. Wire harness with coil wires is the problem. It was fixed by a local shop and the vehicle can be inspected if needed. 2. The car throws a code for a faulty thermostat/coolant temp sensor. This will not allow the car get to oporating temp and could cause engine damage or not perform properly causing risk of an accident. Also this will reduce the driver assist features such as lane assist and adaptive cruise/braking. 3. Yes. 4. A local shop inspected the thermostat and coolant temp sensor and they oporated as they should. 5. The engine light comes on for the reasons mentioned above. It also has a "driver assist reduced" message. It appeared randomly while driving and stayed on for multiple days. Vehicle had a code for a bad thermostat/coolant temp sensor and "driver assist reduced" message. …

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. …

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. …

When I am shifting my vehicle to park (gear shift in console area) and turn my vehicle off I will get an error code in my dashboard that I need to shift to park. My gear shift in the console is lite up P and my dashboard electronic system says P; but when I try to turn my car off it won't turn off and stays on again giving me the error code that need to shift to park. I then have to turn my car back on to then try and turn it off with the same error code coming on. I can try pushing the gear shift further with no success, shift to different gears back to park, and try waiting a few minutes after shifting to park before turning it off and still no success. This is a safety issue that my car is not really in park and will take off if I take my foot off the brake when this is all occurring. …

Initially received Stabilitrak dash warning when brakes were applied for longer than 30 seconds (ie., stop light) for several days with no SEL. Then, while driving along a secondary highway at approximately 60mph, all dash lights lit up, power steering failed, power brake assist failed, and vehicle started stumbling. Pulled to side of road and vehicle shut off. Performed restart and was able to complete drive home (approx 3 miles). Upon arrival and shutting off vehicle, all dash lights illuminated then shut off. Vehicle would not start after (no click, no turnover, indicating failed battery). Attempted to charge/maintain battery but battery charger indicated sulfated battery. Multimeter showd 7.5V. Replaced battery and car started normally but all computer functions were reset to factory defaults. …

Shift to park displays on dash when put in park after I turn the car off. Have to turn the car back on shift from park to drive several times before it finally goes off. Something going on with backup camera when backing up it not always comes up on interior display monitor. The outlet in the console dc outlet not working had it looked at several times the mechanics can't figure out what the issue is all fuses are good And a few times couldn't stat the car after shift to park display pops up had to try several times before it started. Can't understand why GM hasn't ordered recalls on these matters and I'm sure I'm not the only one dealing with these issues. It's a same that in 2026 dealing with issues that I have to pay out of pocket to try to find out what is the problem is.When GM knows these issues are the with the 2019 Chevy Blazer. …

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.

Electrical complaints in other Blazer years