Vehicle is constantly giving -??shift to park-?? error. The steering mechanism has also been compromised, and the vehicle makes persistent jerking motions with accelerating. This could be quite dangerous.

- Covington , LA, USA

For a few months I intermittently get an engine light on, the temperature gauge goes to zero, the AC stops working, and an error that driver assist in unavailable. This will happen for a fee days and return to notmal where everything is fine. This happens on and off again. I google searched this and it is a huge problem with GMC Acadias. I used an obdII scanner and get a P0128 coolant error when this happens even though the temperature is fine. I just recently went over the new car warranty and GMC will not tell me if this is covered or not.

- Monument, CO, USA

Thermostat gets stuck, generally in open state. AC also is disabled in this condition, soft code (no MIL) mentions "limited steering available" and temp gauge on dash goes to 0. Hard code eventually comes (solid Check Engine light on the dash). Code, MIL, and temp gauge can be cleared and fixed by disconnecting battery negative terminal and reconnecting it, and it will run consistently for a while, though it will return. Online there are no thermostat modules for this engine available (3.6L V6, also in Cadillac XT6, Buick Enclave, and Chevrolet Traverse) showing that thermostat replacement is widespread. Online forum searches also describe widespread thermostat issues for this engine, at roughly $1200 per fix. A reliable thermostat is critical for long-term engine functionality, and should not need replacement at half of design life (~75-80k miles). Though this one tends to fail open instead of close, overcooling of an engine still could have its own issues, and failing closed could lead to engine overheating.

- Plymouth, MI, USA

I-??ve had 2 issues with the thermostat going bad. The official part is called the water outlet assembly that includes the thermostat. I-??ve also had several others tell me they have had this issue.

- Honea Path, SC, USA

While driving the temperature gauge shuts down completely to C - the check engine light comes on and a message appears on the dash saying "Steering Assist Reduce Drive With Care". Any air conditioning goes from cold to hot and the fan under the hood goes to high automatically and wont shut off. We have been informed that this is a known error that has existed for a long time now, with no recalls to date. I cannot schedule my vehicle for repairs yet because I do not have the money to pay for the repairs. They are saying that the placement of the thermostat and sensor, which need to be replaced in order to fix this problem, are located in a very difficult spot to get to. Saying that it will take upwards of 4-5 hours to get everything fixed, which increases the amount of money to fix this issue. My 2019 GMC Acadia just started doing this about 2 months ago and I have 54000 miles.

- Athens, IL, USA

When I put my car in park and try to turn my vehicle off I get an error message saying -??shift to park.-?? The problem is the car is already in park and I am unable to turn the off. I usually have to start the car back and drive back and forth before the car actually recognizes it is in park. Im concerned for my safety.

- Elkhart, IN, USA

Gear shift notification problem. Unable to turn engine off after receiving "Shift to Park" message and the gear shift is visibly in the "Park" position. In addition, the doors would not lock. My wife was forced to stay in the unlocked running car in a store parking lot for 25 minutes, until the car just "turned off" on its own. Unsafe for a woman (or anyone) to have to do at 10:30pm. This puts drivers in a really vulnerable position. Vehicle taken to dealer Jan 30, 2023. Was told they were familiar with the problem.

- Alabaster, AL, USA

Steering Assist reduced drive with care" displayed on screen when I was driving. The temp gauge stayed on C, Heat works fine, Happened for a few days.

- Blackstone, MA, USA

Every time I go to turn off the engine it say shift to park and then I have to restart the truck and keep putting the shifter into park a couple of times for it to not happen.

- Haddon Township, NJ, USA

About five months ago, my GMC Acadia started displaying a warning when I would put the car in park, and try to turn it off. The engine would shut off, but the electrical portion of the car would stay on, and would not turn off, because the warning displaying said "SHIFT TO PARK". I have tried every conceivable way to try to get this to go off, but nothing works. My car has stay on for upwards of two and a half hours, to the point where my battery died in the car and left me stranded. There have been numerous accounts of this, as I had read them on forums, yet still no resolution has been published. I have tried taking it to be inspected, but nothing ever comes up. I have two very small children, and if I were to be in public and be stranded because my car wouldn't turn off.... I would be livid.. Also, because of this warning, it prevents the doors from being locked. That is another major concern for me, considering the day in age we're in.

- La Plata, MD, USA

My vehicle would not turn completely off, I would have to start it about ten times before the warning sounds and the yellow light on the ignition switch would go off. I took my Acadia to Rod Hatfield Chevrolet Lexington, KY. I was told that there was an internal short with the transmission shifter, the shifter and harness would need to be replaced. considering that I purchased this vehicle new, and it has 39,793 miles I feel like it should have been covered under the warranty however, it cost me $903.3. I have an open case with GMC who suggested that I contact you to see if my Vehicle Identification Number could be added to for recall.

- Lexington, KY, USA

I purchased my vehicle brand new off the truck in march of 2020 with zero miles on it. Feb 2021 in negative degree weather, the heat on my vehicle stopped working. I called my local GM dealership and they told me they needed to diagnosed the vehicle. They had kept my vehicle for two weeks trying to diagnose the vehicle. It turned out to be the thermostat. they replaced that part on my vehicle. Now Dec 2021 I again have experienced the same problem this time it was in a blizzard. Dealership told me it cant be the same problem, however it will be another two weeks before they can get my vehicle in for service and do not have a loaner vehicles for use. I purchased a new vehicle with warranty as I have two small children and am currently pregnant.

- Spencer , WI, USA

During takeoff with moderate acceleration around 1500-2000 RPM there is an exhaust droning/buzzing sound forward of the front passenger area. Vehicle has been to dealer twice, the first time they replaced the entire exhaust system, but after 6 months the same sound returned. The second time they tried to loosen and retighten the exhaust but the sound returned immediately afterward. The droning sound is more likely to occur after exhaust is warmed up.

- Novi, MI, USA

When accelerating the vehicle exhaust or engine is really loud like there's an exhaust leak.

- Fairfield, CA, USA

The contact owns a 2019 GMC Acadia. The contact stated that there was an abnormal sound inside the cabin of the vehicle while driving with the windows rolled down. Additionally, the automatic emergency braking activated without driver input. The vehicle was taken to rancho grande motors located at 1404 auto park way, san luis obispo, ca 93405, where the contact was informed that the issue was common with similar vehicles. The automatic emergency braking failure was not duplicated. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was approximately 500. The consumer stated the dvd would turn on it. The dealer stated it could be due to a missing remote that was not included with the vehicle. The parking brake would activate independently. The check engine light was illuminated. The steering and engine reduced power the warning light illuminated. The headrest dvd player do not play through the speakers. The wireless phone charger was often inoperable. The second gear does the not shift properly. The dash and radio periodically lose power. The windows make a loud obnoxious noise when rolled down.

- Atascadero, CA, USA

At 500 miles past the warranty expiration the radiator developed a crack along the top seam. The dealership said it was a manufactures defect as the vehicle was less than two years old. GMC declined to replace the part because it was 500 miles past the warranty although they did not deny it was a manufacturing defect. I have a GMC case number documenting my dealings with them. I have photos from the dealership showing the cracked radiator, as well as an email stating it was a defective part. I have the receipt and I have the actual radiator itself. I noticed the radiator leaking on my garage floor when it was stationary. This was 10 days after it was last serviced and there was no issue at that time. The dealership said it was not caused by impact, but just that the seam split at the top of the radiator.

- Florence, AZ, USA

Car automatically shuts off when driving multiple occurrences of this happening

- Kansas City, MO, USA