Upon turning vehicle off, "shift to park!" illuminates on the cluster. Vehicle will not turn off until it is re-started, shifted in and out of gear. Sometimes this needs to be done multiple times. There has been one instance the error would not clear, and I was forced to leave my vehicle on, as I went into a doctor appointment. This is very annoying, not to mention the wasted fuel with starting/stopping the vehicle 5-10 times each time I turn it off. I've taken video of the problem, however, it is too large to upload here. Ridiculous.

- Clarkston, MI, USA

The contact owns a 2017 GMC Acadia. The contact stated that the vehicle would not shut off and the engine ran for hours. Eventually, the internal system recognized that the vehicle was in park and finally turned itself off. The manufacturer had not done anything to address the failure; however, they issued technical service bulletin number: 18-na-297 on December 13, 2018. The contact called numerous unknown dealers across the country to try to buy the part mentioned in the service bulletin, but the part was still on backorder. The part that was needed for the repair was the transmission shifter assembly (number: 13528228). The cost of the part was less than $150. The contact stated that the vehicle was out of its initial warranty. The failure mileage was 47,500. The VIN was unknown.

- Arlinton, TN, USA

Our 2017 GMC Acadia denali says to put the car in park before turning it off when the car is already in park and engine off. All electronics stay on and will kill the battery.

- Pewaukee, WI, USA

The car will not recognize or shift to park.. the car will not turn off while the shifter is in park thinking that the car isn't in park. This is a safety issue since you believe it is in park when the car is saying it isn't and will not clear the alert unless you continuously turn the vehicle on and off and toggle the shifter. I have a video of the issue being reported

- St Augustine, FL, USA

When parking the vehicle and attempting to shut off, the Acadia gives the message "shift to park". the vehicle is clearly in park and I must start the vehicle again and shift to reverse or another position and turn off. The vehicle will not allow me to lock the vehicle and keeps power to the vehicle (draining the battery) until it recognizes that it is indeed in park. This has caused a stall and the vehicle to possibly still be in gear when parked leading to a rolling hazard. Has taken as many as 15 times for the vehicle to realize it is in park. General Motors has issued a tsb (18-na-297) regarding this issue, but is placing the cost of the fix on the consumer. This is a defective piece of equipment that has started a class action lawsuit.

- Concord, NC, USA

At random times, when parking my vehicle, after placing it in 'park' and shutting the engine off, the dic warns to place the vehicle in 'park' even when the shift lever is in 'park'. I have to start the vehicle again, shift the vehicle from 'park to 'drive' and then back to 'park', shutcthe vehicle off and the warning on the dlc goes away. This is starting to happen more often, every 3-5 start-stop cycles.

- Farragut, TN, USA

Shift to park recall - this is a safety issue. My Acadia was in park and I turned the car off and I got an error code that said action required shift to park. I had to turn the car back on put it in drive and back into park and turn the car off the stop the beeping. I spoke to flemington GMC and this issue is not a recall. This makes no sense to me the error code reads action required shift to park. Which clearly means the car is not in park if it's telling you to shift to park when you already put it in park and turned the car off using the start stop button. I am still waiting for a phone call from amber at GMC as I was suppose to be called on 9/3/19 regarding this issue.

- Branchburg, NJ, USA

Getting a "shift into park" message when the car has already been put into park. It takes several times restarting the car and moving the shift lever in and out of park for it to recognize that it is in park.

- Concord, NH, USA

Keeps telling me to put vehicle in park when it's already in park. Also not consistent about telling you to check back seat. Sometimes it does and sometimes it doesn't. it's turned on.

- Jonesboro, AR, USA

The car will not recognizes it is in park and will not let you shut it off sometimes. Even worse it lets you shut it off but isn't actually al the way off. So the battery dies. GM dealer put new shifter in and it happened again. Then they put a bother new sensor in and it happened again.

- Erie, PA, USA

The contact owns a 2017 GMC Acadia. While driving various speeds, the air conditioner spontaneously turned on to the high setting on several occasions. There were no warning indicators illuminated. The vehicle was taken to ray skillman southside Buick GMC (8424 us-31, indianapolis, in 46227, (317) 497-0711) where it was diagnosed that the control module needed to be replaced. The vehicle was repaired; however, the failure recurred. The manufacturer was contacted and stated that the vehicle was working as designed and a beneficial feature that was activated with the outside temperature and humidity. The failure mileage was unknown.

- Indianapolis, IN, USA

The vehicle will not turn off. It keeps stating that it is not in park. Have moved shifter between gears repeatedly, the dash display says it is in park, the console says it is in park, but the vehicle will not turn off. This has happened on flat surfaces, and inclines. The end result is a vehicle that thinks it is on, wont lock doors, and kills the battery due to remaining in the on position.

- Ocala, FL, USA

I have several things that has went wrong with my vehicle since I had bought it two months after I got it it was in the shop sometimes whenever I parked it would not restart brake lights will stay on I've had my check engine light come service brake light has came on I've had the middle seat belt replaced twice nothing stuck in it it just will not latch it is back in the shop now whenever I put it in park it is telling me to shift it into park I had my car for two years and with in the two years it has been in the shop 15 times so much for having a new car and in joying

- Dickinson, TX, USA

Our 2017 GMC Acadia denali is experiencing "action required" "shift to park" alert on the dash. The indicator on the dash shows the car is in "P" for park and the shifter is placed into the park position. The only resolve for this error to go away is pushing back and forth on the shifter until finally sometimes up to ten minutes, the system recognized that the car is actually in park. If you do not spend the time to try and make the system recognize that shifter is in the parked position the car will continue to try alert you with dinging inside the car and then honking. This is a known issue to which has been reported by several people upon our investigation after experiencing the problem. The part to which is needed to fix this issue is currently on backorder per our local GMC dealership to which there is no estimated time to receive the part in to resolve our issue. We are being told it could take "weeks" prior to this part being received to fix the issue.

- Knoxville, TN, USA

When shifting to park and shutting the vehicle off message displays shift to park. I have had the shifter cable replaced and 3 months later it is doing it again. Obviously there is another issue but GM cannot figure the issue out.

- Hannibal, MO, USA

Service side detection system warning came on last year. I took it to dealership since I have extended warranty to cover problems like this. Dealership refused to fix because I had taken a light hit to the rear fender area where the sensor is on 02/06/2016. Friends told me this is a major problem with these vehicles so I looked online and was appalled at the complaints! I am retired and on a fixed income and can't afford the $1,600 or more right now. As a senior this was a reason I purchased this vehicle. Now that it does not work I have to be extra careful with blind spots! this warning came on and function stopped working when car was turned on.

- Powder Springs, GA, USA

When my vehicle was in park & I was going to turn it off it gave me this message action to park when in park. This has happened several times. I have taken it to the dealership & nothing can be done.

- Midland, TX, USA

I got this vehicle brand new in 2016 it has approx43000 miles on it. Last Tuesday it would not start nothing worked towed to the gmx dealer they said it was a map light!!!! and it ran the battery down well today it did the same thing I do not believe it was the battery the same day it went out I received a applicaion download, I have no idea what that was. I paid alot of money for this vwhicle and I think there should be a recall before this problem causes death ' the vehicle is still at the dealership-I called to reort this problen to GMC the first evening noting was done either, called GMC ro toe didnt even show

- Eagle Rock, VA, USA

Dash displays that the transmission is not in park when it is for sure.

- Derby, NY, USA

We have had numerous issues with the cars brakes automatically locking up when something triggers the collision safety break. Specifically when crossing rail road tracks after a train has past. As a result the car stops completely and automatically while on railroad tracks and won't allow you to move. You have to put the car in park, wait (on railraod tracks) and then attempt to move but it may activate it again so you have to do it again. Meanwhile you are on tracks, with cars behind you honking and screaming. This has happened numerous times, reported it to our dealer, service and GMC corporate where nothing was done. They said they would put in a "black box" like device but never did. It is a major safety concern for my family and one that GMC is not addressing adaquately.

- New York, NY, USA