2019 CHEVROLET BLAZER Engine Problems

We are noticing the coolant meter seems to be stuck on C, the AC is not blowing cold and we are getting a message that ACTION REQUIRED steering assist is reduced, drive with CAUTION. Today the brakes slammed on by themselves and almost sent my wife thru the windshield. Luckily she was in a clear area with no other cars around.

Engine temperature gauge is not working. Dash is displaying driver assist issue and steering intermittently locks up while moving. Air conditioning does not work and cooling fan is running at high speed. Thermostat and coolant temperature sensor need to be replaced. Such a high number of these vehicles are failing that i can’t even get factory parts

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.

Thermostat has gone bad. Talked to Chevy and they said it is a known issue.

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.

Diagnosed as a bad thermostat. AC not working. Steering assist issue. Temp gage not working. Car is out of warranty.

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.

Temp gauge intermittently reads cold, no ac and engine cooling fan constantly blowing, dash warning re power steering, 40,000 miles, code po128, review of google indicates this is a common problem and likely needs a new thermostat and ect

35,000 miles and P0128 code that does not resolve after expensive repairs of coolant Temperature sensor and thermostat multiple times.

P0128 error, power steering reduced warning, cooling fans on, no a/c and temp gauge stuck on cold

"shift to park" message appears when parked (even if safety brake is engaged) and attempting to turn off the vehicle. The vehicle does not turn off and remains running for various periods of time. Unable to turn the vehicle off, leaving it unsecure and drains the battery. This happens consistently. I contacted my local dealership and they confirmed getting several of these reports through their shop, but no recall has been made.

The Blazer is having a recurring P0128 code. We have informed the dealership. This has been going on for 2 years or so. I reset the code with a code reader and it stays off for a few months usually. Tried to have the dealership look at it one of the last times it happened but they wouldn't just look at it...they wanted to set up an appointment. We needed the car so I reset the code again. Now it is time to get it fixed. I know it needs a thermostat and temperature sensor. The cost to install it will be close to $1000. This should not be at my cost. This is a know issue with the 3.6L engine and it affects the emissions of the vehicle along with many other parts of the engine. I am reaching out to see what can be done.

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.

Coolant Thermostat needs replaced at 59945 miles. The temperature gauge stopped working and the A/C unit shut off. The temperature outside created a safety issue for my family and I to ride in the car. The engine light came on and a message that stated the Steering Assist was effected. This should not happen in a car under 60000 miles.

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. The cause is NOT the temp sensor or thermostat and is actually a wiring harness that two wires need to be separated from the bunch. The frequency from one wire interferes with the coolant temp sensor wires. I am on several forums for chevy blazers and there are TONS of posts about this issue with the 3.6 V6. Most people will go in and have these expensice parts replaced. It is not acceptable to have people get charged for a $800+ job when the part is not faulty.

Po128 temp. Below normal, happens on a regular basis, at least 2 times a week,

Reduced steering warning, the temperature gague is stuck on C, radiator fan is running on high as soon as I start my car and the transmission is shifting hard at second and third gears.

My 2019 Blazer gave a Steering Assist warning on 2 Nov 2024. I was aware of a recall for other Blazers but for some reason my VIN was not among those recalled. I took it to the dealership on 6 Nov 2024. The dealership has determined that the issue is indeed the same issue with those other Blazers that have been recalled but refuses to include my car in the recall because the VIN number wasn't originally among that recall. I was told that the car needed anew temperature gage and that they would have to order it, however, the component was available outside of the dealership. I paid for the diagnostics and the part, being told that the light(s) would stay on, I would still be able to drive it and that I would receive a call when the part came in. It is my understanding that the steering assist reduced can affect the power steering and essentially revert back to manual power steering, potentially causing a loss of control while driving and increasing the risk of accidents. There were no warnings of the steering failure assist warning. It just appeared on Nov 2, 2024 at 1130am. About 1240pm I noticed that the temp gage was inop and the check engine light was now illuminated. I contend that because GM has already identified the thermostat issue serious enough to do a recall, then all Blazers with that recall issue, VIN number aside, should be given the same consideration and not have to pay for something that GM has already taken responsibility for. The dealership however does not agree for the simple fact that the VIN was not identified in the original recall.

We had the shift to park issue 3 years ago and fixed it. Cost near $300. Now we are taking it back in for the same exact issue. In addition to this issue all the lights on the dash board keep coming sporadically and on star sent us report with a ton of engine and transmission issues.

Receiving shift to park error when attempting to shut off my vehicle. In December 2021 I had the parts replaced at the dealership, and as of a week ago the issue has started back. I am concerned that I will be stucked somewhere unable to shut off my vehicle or worst-case it doesn't actually stay in park.

Received repeated message on display " steering assist reduced, drive with care" Engine races at times and Auto Stop quicks working. Could lead to a crash if steering is restricted due to P0128 code was repeatedly triggered as a fault code. Turned out to be thermostat which is being replaced on thousands of these vehicles. You can search for the message. GM is replacing under powertrain warranty however many vehicles are beyond warranty. This is approximately a $1000 repair.

I cannot shut off my vehicle. When I turn off engine warning message and alert binging tells me to shift to park. The vehicle is in park but vehicle does not register that it’s in park. I’m stuck in vehicle which will not stop alerts and runs down battery. This is a hazardous situation. I can’t tell if car is actually engaged in park or not. This started happening intermittently over the last month but now it happens 8 times out of 10 when I try to shut off the vehicle.

The starter and flex plate failed (cracked) on the vehicle while on the road due to the auto start stop feature. When I stopped for a red light, the car made a loud grinding noise and would not restart leaving me stranded in traffic. The 2019 Blazer has the auto start stop feature which cannot be disabled and likely results in excess wear and tear. GM updated the 2020 model to allow the function to be disabled. GM has a number of technical bulletins highlighting both starter and flex plate issues, the first being in 2020. Both the starter and flex plate failures were verified by Reeder Chevrolet in Knoxville TN. I've asked for the flex plate to be provided when repair is complete. There were no warnings via check engine lights or any strange noises prior to the failure.

What component or system failed or malfunctioned, and is it available for inspection upon request? The radiator How was your safety or the safety of others put at risk? The vehicle can overheat, causing vehicle break down on the road Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Vehicle was inspected by Chevrolet Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No warning lights, coolant was pooling on driveway The vehicle was inspected and repaired by Chevrolet, radiator and coolant were replaced.

My vehicle was diagnosed with a faulty thermostat, specifically that the thermostat was sticking and needs replaced. My vehicle is at approximately 59,150 miles as of 12/27/2023. Prior to the diagnosis of the faulty thermostat, I intermittently received a warning message "Steering assist reduced - drive with caution", the thermostatic fan would run at full speed, and the P0128 check engine code was illuminated. These symptoms began approximately at the beginning of December 2023. The problem was confirmed by a certified GM dealership service department.

I looked online and a lot of Chevy products are having this issue. Something will pop up saying limited driving assistance then your cold hot gauge doesn’t work is get stuck your air conditioning quits working your oil gauge quit working your battery how much voltage you have quits working it falls your whole window up where you can’t see. This is an ongoing issue with most of GMC vehicles, especially blazers. This is a safety issue that could cause your car to blow up or your windows. The fog over where you can’t see and you have a wreck and I could kill you.

Shift To Park message displays while vehicle is already in Park! Incident began increasing in frequency in late 2022 . Vehicle would not Shut Off! Bulletin on problem came out in 2019, Chevy did not inform me of this Safety issue , Grandchildren in vehicle at least 2 times . Chevy charged me for the fix , Chevy was aware of problem before warranty expired !

Hesitates between 1 and second gear. Also makes an electrical humming sound

Eco stop/ start died three times since I bought car. I am unable to turn off this option and the accident feature starts to break when I’m not near another car. Any Electrical issues cause the car not to start.

When placing the vehicle in park and turning off the vehicle there is a message on the dashboard saying ‘shift to park’ and the vehicle will not shut off, and you cannot lock the vehicle due to the error message.

WHILE DRIVING, VEH SHOWED MESSAGE , ENGINE POWER BEING REDUCED, SERVICE PARKING BRAKE. THEN IT DIED AND WOULD NOT RESTART. PARKING BRAKE WAS NOT ENGAGED. VEHICLE WAS IN DRIVE AND MOVING APPS 30 MPH. I WAS DRIVING STRAIGHT. NOW THE CHECK ENGINE LIGHT STAYS ON. VEHICLE HAD REDUCED POWER AND FEELS LIKE I'M DRIVING WITH BRAKE ENGAGED. WHEN THE VEHICLE DIES THE BRAKE SERVICE LIGHT ILLUMINATED AND THEN TURNED OFF AFTER APPS 6 MINUTES.

Mileage: 767

WHILE DRIVING THE BLAZER THE VEHICLE LOST POWER. IT WAS MISSING AND DIDN'T WANT TO GO. THE WARNING LIGHTS CAME ON. I HAD TO CALL THE TOW TRUCK TO COME PICK IT UP. I HAD IT DELIVERED TO THE SHOP WHERE I BOUGHT IT. THAT WAS ON SUNDAY, OCTOBER 6, 2019. ON MONDAY, OCTOBER 7, 2019 I WAS CALLED AND THE CONCLUSION WAS MADE THAT I HAD A DEAD INJECTOR. THEY REPLACED INJECTOR #5. PICKED IT UP ON TUESDAY, OCTOBER 8, 2019. DROVE IT HOME AND ON WEDNESDAY, OCTOBER 9, 2019 ON THE WAY TO WORK, I ENDED UP ON THE SIDE OF THE ROAD AGAIN. THE CAR DID THE EXACT SAME THING AS ON SUNDAY. THE CAR WENT DOWN TO 20 MPH. I WAS ABLE TO LIMP IT TO A PARKING LOT. I CALLED A TOW TRUCK AGAIN AND TOOK IT BACK TO THE SHOP. I AM STILL WAITING ON THE DIAGNOSIS AS OF FRIDAY, OCTOBER 11, 2019.

Mileage: 3,042