Numerous occurences especially recently of shift vehicle to park when vehicle has been parked, turned off and already shifted into park position. Several occurrences where almost every time within 24 hours I use my cruise control and air conditioner at the same time my check engine light will come on as well as the stability trac indicator which then causes my air conditioner not to work and inability to start the vehicle due to having a check engine light on.

- Grand Island, NE, USA

The thermostat stops working and my a/c stops blowing cold air, and driving assist stops and engine light goes on. It is a rampant problem among GMC Acadias with no reason or fix. Please advise.

- Naples, FL, USA

unknown

- Huntsville, AL, USA

2018 Acadia will display -€œShift to park-€ warning along with an audible warning when the vehicle is shut off. This happens even though the PRNDL display is in the -€œPark-€ position each time. If I try to exit the vehicle, the audible warning continues (apparently indefinitely). This began at an odometer of about 59,200. Initially, the situation could be corrected by restarting the car and shifting in and out of Park or depressing the shift knob several times. Within a couple of hundred miles, it became consistent and eventually could not be corrected as described above. Unfortunately, this is not covered under warranty. I began driving for a few months without the shift knob, simply depressing the plunger on the shift rod coming up from the transmission. Doing this, the warning rarely occurs and, if it does, it-€™s easily corrected with one or two presses of the plunger. Some modifications of the shift knob have allowed the knob to be used with results similar to driving without the knob. I hope there will be a software update (deployed over OnStar) to use the PRNDL information and eliminate this failed system.

- Columbiaville, MI, USA

For months after putting car in park it displays a "Shift to Park" message. It won't let you fully shut down vehicle. Some times I can start it again, back up a little, put it back in park for it to shut off. Not one time though. You have to do it repeatedly. Maybe 6 or 7 times before it works. Most times I just finally have to walk away from the vehicle. Problem being it won't let me lock my car - which the police in our area keep warning us to do to prevent the vehicle thefts. It also continues to 'bing', running down the battery, which could leave me stranded somewhere. I looked this up on line assuming it would be a recall because it is a 'known defect' and there are thousands of complaints on line of people having the same issues and dealer won't take care of. There are lawsuits. This should be a recall.

- West Paducah, KY, USA

The contact owns a 2018 GMC Acadia. The contact stated that while driving at an undisclosed speed, the rear liftgate warning light illuminated. The contact stated that upon inspection, the liftgate was closed. The contact stated that after parking the vehicle, the liftgate failed to latch securely and a bungy was used to keep the liftgate closed. The contact stated that the dome light illuminated indicating that the doors were open; however, the doors were securely closed. The contact stated that the roof light was turned off and the radio failed to operate. The vehicle was not diagnosed or repaired. Neither the dealer nor the manufacturer was notified of the failure. The failure mileage was approximately 200,000. The VIN was not included.

- Cropsey, IL, USA

When shifting the car into Park the P lights up and the car appears to be in Park, but an alarm goes off when you press the stop button to turn the car off. Action Required : Shift into Park. You have to restart the car and move the shifter or press the button on the shifter to get it to recognize that the car is in Park. This has gotten worse, last time it took over 20 minutes to get the car to recognize it. I have the car scheduled to go to the shop tomorrow. Warranty has expired due to date. Car only has 17,760 miles on it. 05/27/2022 was the last time the car was driven. I am sure they will try to charge me for this. It is a known issue and there seems to be a class action law suit over it. TSB - 19-NA-206 Dated September 2019. This should be a recall.

- Easley, SC, USA

Vehicle does not recognize when in park, safety issue as passenger or driver could step out of vehicle while still in reverse. Unable to shut down vehicle due to not recognizing vehicle is in park.

- Waconia, MN, USA

Shift to park warning when parking and shutting down vehicle. Shifter is in park but will not shut off electrical system of vehicle.

- Grand Ledge, MI, USA

Shift to park switch is defective. Switch will not register transmission is in park causing an alarm that runs battery dead. Car has set in my driveway 3 months unable to drive.

- Martinsville , IN, USA

Had to replace the shifter, harness, and parking assist module to the tune of $1569! When it was put into park the system would not acknowledge it was in park...therefore I could not lock the vehicle and an alarm kept going off. My Acadia only has 12,000 miles on it...NO excuse for having to replace those parts with or without a warranty! Dealership said I am not the only one this has happened to...they have replaced a number of them!

- Las Vegas, NV, USA

Shift to park notification keeps coming on after shutting off the car. It obviously has been shifted in to park before turning off the engine, but the notification keeps popping up. I have had the shift harness replaced by a mechanic once alreafy. He says this is the GMC authorized fix. IT DID NOT FIX THe PROBLEM! Of course, he'll put another shift harness for me, but what are the odds that will solve anything. GMC needs to come up with a better solution! It is frustrating and time consuming trying to come up with whichever trick will work to make the notification to away. I am not a very happy customer!

- Marcus, IA, USA

My -€œShift to Park-€ warning light pops up when attempting to park the car and shut off the engine. My wife had the problem at the grocery store and was very upset. This problem is constantly happening, my wife refuses to drive the car. I called the GMC dealer to get it looked at and was told it would be 2 weeks until they could diagnose the problem. Also it would cost $150 to look at it and I see the repair could be between $400 and $2000. The warning lights won-€™t stop and the constant bell dinging won-€™t stop until the battery is dead. All anyone has to do is Google -€œ shift to park-€ to see this is a defective switch. Many states have filed class action suits. A recall needs to be issued. My car has 33k miles on it.

- Panama City Beach, IN, USA

Shift vehicle into park and then turn vehicle off. Warning light comes on which says "shift to park." Turn vehicle back on. Move shiftier from park to drive and then turn vehicle off again. Warning light comes on and warning "shift to park." Do this a few more times and it finally the warning stops. It does this intermittently.

- Arlington Heights, IL, USA

The contact owns a 2018 GMC Acadia. The contact stated while parking the vehicle, the gear shifter was shifted to the park position however, the gear shift indicator failed to show that the vehicle was in park. There were several attempts made before the shift indicator showed that the vehicle was in Park. The vehicle was diagnosed but not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 44,000.

- Russell Springs, KY, USA

I have numerous warnings, shift to park, steering, cross traffic, this endangers myself and anyone else around me, i have read several class action suits involving these problems and it could cause my vehicle to pose a danger, I have taken my vehicle in to a certified dealer and they state there is no known recalls associated with my vehicle which is strange because GMC knows that there are thousands of vehicles having the same problem, did I buy a lemon? These problems are clearly manufacture related and in no way normal wear and tare. I should not have to compensate these issues when I paid near 40,000 for

- Byron , MI, USA

When I put my car in park and turn off it will randomly say "shift to park" it started doing this in Aug or Sept 2019 the car was under warranty and I brought it to a dealer to "fix". fast forward April 2021 it started to say shift to park again and car is no longer under warranty. Called different dealers even the one I brought the car to fix problem (that was a joke), they know its a problem and saying since that part got fixed in 2019 with a bad part and now there is a a newer fix that should work better, but I will have to pay for diagnostic test and part again. Again they know it is a problem with these cars and it needs to be recalled. I have to turn the car off and on reshift, push the shifter harder, etc to get the message to go away so I can turn my car off.

- Belton, MO, USA

Will say that vehicle is not in park and will not shut off. Constantly says remote device not detected despite me using the remote to start or turn the vehicle off. Will not officially turn off saying remote not detected and radio will stay on. I can use the remote to turn it back on but the receive the same error message, this happened 4 times when we parked at the ball fields Sunday. How frustrating that we had to hang by the car hoping the next try it would cooperate. This is clearly a problem that GMC needs to fix. These are not one time errors, I have some type of error daily.

- Spring Hill, KS, USA

Vehicle when put in park does not shut off. Took to hillsdale GMC 1/13/20 and it was okay for awhile. This same problem started about 3 mo ago again. Put in park will not shut off. You may have to restart, pull into gear, back to park, over and over! very annoying especially if you have an appointment!

- Jonesville, MI, USA

Shift to park error, on computer display.

- Moffit, ND, USA