2019 Chevrolet Blazer electrical system problems

Related recalls

No recalls on file.

What owners say

1. Filed May 25, 2026MDElectrical SystemEngineSteering

   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…

   NHTSA complaint #11739939 · source
2. Filed Apr 6, 2026MSElectrical SystemSteeringTransmission & Drivetrain

   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.

   NHTSA complaint #11729329 · source
3. Filed Mar 23, 2026MNElectrical SystemOther / Unknown

   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…

   NHTSA complaint #11726346 · source
4. Filed Feb 9, 2026TXElectrical SystemSteeringTransmission & Drivetrain

   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…

   NHTSA complaint #11716876 · source
5. Filed Dec 26, 2025MSElectrical System

   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

   NHTSA complaint #11707072 · source
6. Filed Oct 1, 2025AZElectrical SystemEngineTransmission & Drivetrain

   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.

   NHTSA complaint #11690844 · source
7. Filed Sep 3, 2025VAElectrical System

   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

   NHTSA complaint #11684781 · source
8. Filed Aug 28, 2025MDBody & StructureElectrical SystemTransmission & Drivetrain

   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

   NHTSA complaint #11683602 · source
9. Filed Aug 26, 2025NEElectrical SystemEngineSteering

   I keep getting this message that pops up, "Steering Assist reduced Drive with Care". At the same time this happens the temp gauge stays on cold, the ac quits working, the engine fan is on high, and most of the time I get code PO128. We have had it in to the dealer and they said the its the thermostat or the temp sensor. From what I am reading it could be a factory issue with the EMI issue from sensitive ECT circuitry. This has been an ongoing issue for us for over a year.

   NHTSA complaint #11683213 · source
10. Filed Aug 20, 2025OHElectrical System

    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.

    NHTSA complaint #11681906 · source
11. Filed Jun 15, 2025OHElectrical SystemEngineTransmission & Drivetrain

    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,…

    NHTSA complaint #11666997 · source
12. Filed Jun 9, 2025GAElectrical SystemOther / Unknown

    coolant temp gauge stuck on cold, AC quits blowing cold air, reads the thermostat code when check engine light comes on. Was told my car needs a new thermostat and a coolant temp sensor. This has proven to be a common issue among Blazers. there is no rhyme or reason when this happens and will fix itself after a while, but then happens again.

    NHTSA complaint #11665803 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology