2021 GMC Acadia Engine Problems

The contact owns a 2021 GMC Acadia. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. In addition, the coolant fan was running after the engine was turned off. The vehicle was taken to Auto Zone to be diagnosed due to the check engine warning light being illuminated. The contact was informed that DTC: P1098; was retrieved, which indicated a fault with the coolant control valve. The vehicle was taken to the dealer, where it was confirmed that the coolant control valve had failed. The vehicle remained at the dealer unrepaired. The contact related the failure to the Manufacturer Recall Number: N252508341. However, the VIN was not included in the recall. The manufacturer was made aware of the failure and advised that the VIN was not under recall. The failure mileage was approximately 69,000.

Car was taken in for an oil change at 62k Miles. Dealer advised that it needed a radiator replaced. At 64k miles it was brought into the dealer for warranty work due to a failing thermostat. While being diagnosed, we were told not only the radiator needed to be replaced, but the oil cooler also needed to be replaced. So a 5 year old car with just over 60k Miles had the thermostat/sensor fail and need to be replaced. A radiator fail and need to be replaced and and an oil cooler fail and need to be replaced. Vehicle has been at a GM dealer for all maintenance. No crashes or reasons these parts should fail. Vehicle has never towed anything to but any sort of strain on the cooling system.

GM need to be looked at for faulty Thermostats being put into vehicles. While driving the message "steering assist is reduced " You get to a safe place and shut you car off and the fan still runs. After speaking with my dealer today, he said he has done 7 in last week. And if you look online, everyone especially Acadia models is having this problem. Customers are getting charged alot of money for the repair. To me this is a defective thermostat on GM and needs to be addressed

The contact owns a 2021 GMC Acadia. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated and DTC: P04FB; was displayed. The vehicle was taken to the dealer where it was diagnosed with moisture of the crank case. The vehicle was repaired. The contact stated that the failure was a quick fix and was covered under the warranty. The contact stated that the failure had occurred several times and was covered under warranty. The contact was informed that there was no fix for the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 37,000.

The contact owns a 2021 GMC Acadia. The contact stated that after a routine maintenance at the local dealer, it was noticed that the radiator was leaking coolant. Upon further inspection, the contact and his son noticed that the driver’s side of the radiator was corroded. No warning light was illuminated. The vehicle was not repaired due to the cost. The manufacturer was made aware of the failure. The failure mileage was approximately 32,175.

While driving the engine cut out. I wasn't able to get the vehicle off the road and had to put in an acceleration lane until I could get a tow. Other drivers entering the roadway were accelerating and some didn't realize that my road hazard lights were on and almost hit me. The vehicle was given a diagnostic check by a service station and say that the Fuel Pump Power Control Module is not working. After checking the Internet I found a recall for this item on other GMC models but not the Acadia. There was no advance warning for the malfunction.

Been happening for a year and a half. Muffler is very loud and rattles constantly. Getting worse over time. There is a current recall but my vin isn’t included even though my car is having the same issue.

Vehicle stalled out and instrument panel showed no gas when the tank was over half full. I had trouble re-starting but was able to only drive a mile before stalling again. Both times occurred at a stoplight I had it towed to local dealer . They replaced the fuel pump power control module. The service personnel said that they see a large number of these and that some people had accidents due to this. I was about to enter a very busy highway at rush hour and if this happened on the highway, it would be very dangerous. I saw that there were previous recalls on GMC/Chevy vehicles similar to mine from 2021 that had recalls for this same reason but the Acadia has not been included. From what I have seen, a recall should be considered.

Engine exhaust makes vibrating noise similar to a leaf blower under acceleration. TSB issued due to common issue and GM refuses to recall or fix. Broken baffle/weld inside of front muffler/resonator on exhaust system under front passenger compartment. Issue getting worse. $2500 at local dealership to fix, with GM offering “assistance” to fix issue in the amount of $742 leaving the consumer with balance. At what point will the rest of the defective part deteriorate and cause clogging issues and more damage?

VEHICLE'S ENGINE INCURRED COOLANT TEMPERATURE ISSUES, SET DTC CODE, AND COOLING FAN RAN AFTER ENGINE WAS TURNED OFF. DEALER DIAGNOSED AS THERMOSTAT FAILURE AND COMPLETED REPAIRS. DEALER CHECKED AND FOUND NO SERVICE ASSISTANCE FOR REPAIR EVEN THOUGH THERE WAS A BACK ORDER FOR REPLACEMENT PARTS AND WAS SECURED THROUGH DEALER IN DETROIT CURRENT NHTSA ID NUMBER 110243390 / MFG COMMUNICATION # N252508350 REFERRING TO 3.6 V-6 ENGINE. GMC DECLINED ANY MONETARY ASSISTANCE TOWARDS REPAIRS WITH 76278 MILES I ALSO OWN A 2020 CHEVROLET BLAZER WITH A 3.6 V-6 ENGINE THAT EXPERIENCED SAME FAILURE PAID $400 DEDUCTABLE TOWARD REPAIR

The contact owns a 2021 GMC Acadia. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer where it was diagnosed with a fractured rear cap catalyst converter cap. The contact was informed that the catalyst converter needed to be replaced. The vehicle was not repaired. The contact stated that the original catalyst converter was replaced by the same dealer less than two years ago under warranty. In addition, the contact stated the front catalyst converter was replaced by the same dealer five weeks ago. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the NHTSA Hotline and report the failure. The failure mileage was approximately 86,000.

May 2023 we took the car to the GM dealership for a electronic recall. We reported a rattling noise at that point in time. Whatever repair was done that the car ran w/o any noise for nearly a year. April 2024 the catalytic converter failed at just 61K miles on this vehicle. The mechanic at the same dealership noted a broken mounting bracket and replaced the catalytic converter. October 24 2024 at 76K miles the car started making the same noise. The mechanic at the same dealership noted a loose mounting bracket due to an excessively vibrating catalytic converter, a crack on the cat converter, a leak and sequentially damaged front pipe. They noted they made all of those repairs. They noted they test drove the vehicle and verified the car was repaired. October 26, 2024 after those final repairs the car made a loud revving noise and emitted a smell of sulfur. The next day the car died on the road while driving. Every system of he vehicle shut down and I narrowly avoided getting hit from behind. On 11/2/24 We had the car towed to the dealership again. The mechanic noted the recent replacement on the cat converter & oil had leaked intermixing. That caused the motor to seize and the car to stop working while I was on the road driving. I can't imagine what could've happened to me had it stop on the highway at 65mph.

I have a really loud buzz & rattle noise. I can feel vibration on the passenger floor board real bad. The loud noise usually around 2,000-2,500 rpms. I have 39,000 miles on my car. It has always made a noise at take off but we thought it was normal untill now it's extremely worst. I took it into the dealship they diagnosed as something broken inside the muffler / resonator / weld inside muffler. So I did my research on the internet and I see alot of people complaining about this same issue on there cars. There was even a BULLETIN NUMBER (PIT5863) Pulished on 11/2/2021 the correction review # (21-na-118) all my issues are identical to bulletin. My year,make,model and issues with my car.

car had only 5000 MILES . We live in denver took it to mountains for first time. we are both in our late 70 s . going down mouintains vail pass car engine EXPLODED CAR WENT INTO COMPLETE stop at highway speed. LUCKY WE DID NOT DIE as car went off to berm on i 70 west. milemarker 180 OR SO. GMC roadside called after 18 hours finally consented to tow car back to denver. we called 911 FOR FEAR OF OUR LIFE with trucks wheezing by. " GMC national" would not buy back car. my wife and I explained to gmc we were in a panic when this happened. DEALER AUTO NATION FOUND THAT pistons were blown up as well as engine. THEY OFFERED to give us new ?REBUILT engine .. we refused as we are very frightened to be in this car. DEALERSHIP FINALLY offered to buy car which we consented . GMC refuses to pay any of our trip interruptions expenses case no SR9-8150020854 april 1-866 790 5600 ext 5913625 PISTONS CONFRIMED BY AUTO NATION WEST GOLDEN CO TO BE DEFECTIVE AND SPONATEOUSLY BROKEN PISTONS THERE WAS DEFECT IN PRODUCTION OF PISTONS NO SAFETY WARNING THAT CAR ENGINE EXPLODED CAR JUST COMPLETELY STOPPED SUDDENLY

The contact owns a 2021 GMC Acadia. The contact stated that while driving, he heard a loud rattling noise coming from the exhaust. The contact then stated that the RPM’s increased and the rattling noise became louder. No warning light was illuminated. The vehicle was taken to the dealer where it was diagnosed that the exhaust resonator failed the whole exhaust assembly needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 28,000.