The side blind zone alert system failed last year and caused the car to die and leave me stranded. The vehicle was still under manufacturers warranty and the dealership stated that the side blind zone system was faulty and replaced the module and sensors. A little over a year later and the system is doing the same thing. I will have to replace the module and sensors. This should not be my problem, GMC has created a faulty sensor system and now consumers are having to dish out 700 plus dollars for the repair. There is a 'bulletin' that conveniently does not cover al VIN numbers mine included! how can that be possible if it's the same faulty system? I would like this repair to made by the manufacturer and there should be a class action lawsuit regarding this matter. The vehicle died as I was pulling into a parking lot, thank god! I had to have it towed and repaired

- Mooers, NY, USA

On December 29, 2020, I was going to visit a friend about 5:30pm. They have a driveway that is a downward slope. I put my car (2017 GMC Acadia denali) in park and turned it off. I stepped out and locked the doors. I was talking to my friend's husband for a couple minutes, asking if she was home and if my car was okay where it was parked. I wanted to make sure he was not leaving and was blocked in. I then started walking to the house. I was going to walk in the grass and just go to the front door, but since it started to snow, I walked down the driveway. My vehicle then started rolling down the driveway and knocked me over. It proceeded to drive over me. I know I fell on my stomach, as my hands and knees are pretty bruised and scraped up. As the vehicle proceeded to keep going, I was pushed on my back with the tire resting on my right hip. The gentleman ran up and tried to push the vehicle off of me, but could not push it up hill. Luckily the keys and my phone fell out of my pocket and he was able to start the vehicle and drive it off of me. I know at some point I did hit my head, because the back is really tender today. I did go to urgent care to get X-rays because I do not want to go to the hospital with all the covid cases here in St joseph county. They did scrub all the rocks and dirt out of my back and hip and cleaned up my knees. My ex rays came back with no broken bones and I did not have blood in my urine, but they still recommended that I go to the emergency room. I am not able to walk very well and my hip is very swollen. I contacted the dealership because my car was just in the shop because the shift to park light kept coming on in October and I have my repair order that says the problem was fixed on October 22, 2020, which obviously it was not.

- Mishawaka, IN, USA

My 2017 GMC Acadia shut off lost all power for a couple mins at a busy intersection in September 2020. All power restore after several minutes and attempts to restart. I took in to the dealership however they could not duplicate. Now on the 28th of December 2020, the vehicle lost all power again at the same busy intersection! no power at all! could not even turn my hazard lights on to warn traffic that was coming up behind me on the highway! the vehicle remained like this for 10-15 minutes! couldn't even have anyone push it off the road because we couldn't shift it to neutral either. I took it back to the dealership as GM advised and they still could not duplicate. The dealership tried but cannot make sense of why this keeps occurring randomly. I had my small children in the car this time and we are lucky we did not get rear ended! I fear that my family is not safe in this vehicle.

- Walkersville, WV, USA

Shift to park not engaging into park position, it was stationary

- Quincy, MA, USA

Park to shift warning when trying to shut off vehicle. Problem "fixed" 12/28/2108 but resurfaced again October 2020. Now "out of warranty" many posts with other owners experiencing recurring issue. Does not seem to be a consistent fix. New shift mecahnism, new wiring harness and "bending" the metal contact point that depresses the switch to eliminate the warning "lockout" are the most common fixes. I believe this widespread of an issue should be addressed by GMC instead of burdening owners of affected vehicles with the costs of "trying" different fixes. Thank you

- Phoenix, AZ, USA

Since I purchased this vehicle I've had the stabilitrak, parking brake, steering assist warnings pop up along with lights flashing and the car reduces power when this happens. If you reset the codes, itt stops. I've taken it back to the dealer to get it fixed and they don't know what's wrong with it. I've had this vehicle 3 years and it's been nothing but trouble.

- Galatia, IL, USA

The 'shift to park' light comes on even though my car is already in park. I have to sit there and rock my shift back and forth until the warning lamp goes off. Otherwise I can't turn my car off.

- Basile, LA, USA

Car gives "shift to park" notification when car is shut off even though it clearly shows it is in park. Car will not fully shut off. Have to turn car back on and wiggle shifter or put it in reverse/drive and then back in to park for the car to fully turn off.

- Marine City, MI, USA

The "shift to park" warning message shows up and won't permit car to be shutoff. Vehicle is stopped and at rest and is placed in "park" as designated by shift lever light and dashboard indicators, and the auto door unlock feature activated correctly when placed in park. On 9/21/20, it took me about 10 minutes of trying different positions and by physically moving vehicle to a different parking space. Problem occurs sporadically. This same problem has occurred a total of about 5 times in the last 2 weeks but not as severe as this last time. Vehicle was previously serviced 11/2019, when vehicle was under warranty with 10,062 miles for the same issue in which the dealer replaced a shifter harness. Now, 9/21/20, 10 months later, and 12,400 miles, the same problem has re-emerged. The vehicle is now out of warranty. This is obviously a manufacturing or engineering defect.

- Nazareth, PA, USA

When I park my car, and the gear is in park, when I try to turn the car off, I receive continuance notifications stating "shift to park" and can not fully turn the vehicle off. The issue has been continuous and at times can take up to five minutes before I can fully shut the vehicle off. The most recent event was 9/17/2020. I have several videos of the issue occurring. This is a known issue with the dealership but they will not fix it on this vehicle since there is no recall and is out of bumper-to-bumper warranty.

- Stockton, CA, USA

I get an error message when trying park my car stating "action required, shift to park". display shows car in park and shifting console in park. Sometimes takes me multiple times shifting and reshifting, and driving back around to get the car to shut off. This morning took 15 minutes of trying to get the car to park and shut off.

- Avon, OH, USA

I'm having issues of getting an error message on my dashboard of 'shift to park' when the SUV is already in park. I've had this randomly over the past few weeks, but figured I'd just mention it to the dealer at the next appt. Generally, I restart it, move the gear shifter, and then it goes into park. Saturday, the gear shifter showed I was in park, the error message came on, and I started rolling backwards! I was thankful no one got hurt, but I'm concerned that one of my kids could have been behind me and this happen. I put on the break, had to turn off the car, and then restart it, move the shifter before it would recognize being in park.

- Bartelso, IL, USA

I bought my 2017 GMC Acadia on August 3, 2020. When I got home I put my vehicle in park and on the screen it said "shift to park." I had parked on a hill and I thought maybe that's what had caused it. So for the next couple weeks it has done the same thing multiple times. I am usually parked and shifting it into park. I have been late to work because I am constantly fighting with the shifter so my car will shut off. I have googled it and there a ton of reviews saying that they are having the same problem as me. I am very disappointed that nothing is being done about this. I paid a lot of money for my vehicle and I'm making a payment on it as well. I have to small children and it's a safety hazard because some has made comments that their vehicle rolls backwards. Something needs to be fixed. Some have had it fixed and two months later it happens again. I have called the GMC dealership near me, corporate, and the dealership I bought it from and they are all looking into the problem. We, as in the people that bought the vehicle, shouldn't have to pay for a mistake the GMC clearly knows about.

- Lynn, IN, USA

The horn on my 2017 GMC Acadia is very hard to push. It takes both hands. And is still very hard to push. If I had to activate my horn to avoid an accident, I would not be able to in time. And I have to take both of my hand of the steering wheel to push it. This is a very bad design and should be corrected.

- Ottawa, KS, USA

The vehicle displays "shift to park" when turning off vehicle even though the transmission is already in park. We have tried many times to restart the vehcie and shift the vehicle. As designed, the keys must stay with the vehicle, so the occupant either has to leave the keys unsecured or stay with the vehicle. I've had to unhook the battery because the electronics will not shut off when in this state. We have had instances where someone has to stay with the vehicle for periods of time. An online search shows many complaints about this issue and no definitive fix.

- Cedar Rapids, IA, USA

I will shift my car to park and then I go to shut off the car and I get a message that pops up saying "shift to park" I can not lock my car and wont shut off filly until I can get it to shift into park fully. Vehicle was stationary when I shifted to park it had happened about 10 to 25 times in the last month

- Ashford, CT, USA

Car will not recognize that the car is in park and will not shut off.

- Abilene, TX, USA

The vehicle, when parked, shows a warning that states"action required:shift to park" and the vehicle will not turn off. This has led to the vehicle dying in parking lots, at home, once when on vacation. The shift lever is in park, the dashboard shows that it is in park, and when the engine off button is pressed the vehicle will not turn off and asks the driver to shift the car to park, where it already is. This has been a hazard to our family and our families health as the vehicle will then die eventually because the battery runs out. It is apparent that there is a severe malfunction in the electrical/gearbox/computer system not recognizing where the shifter is at the moment. I would like to add a photo but if I were to turn the car on to take the photo the car likely will not turn off, and then die once again. This has been ongoing for approximately a month to 6 weeks. I will put the date below as approximately July 4th 2020.

- Sacramento, CA, USA

Although in park, the dash alerts the following message : 'shift to park' this alert does not allow the vehicle to be shut off fully as the radio still plays, lights remain in and the dash remains lit. Have tried to restart and shift into different gears then return to park as well as engage the emergency break. Nothing works to fix this.

- Lake Park, GA, USA

The vehicle will show to be in park, but the vehicle will say it is not in park enabling me from being able to shut the vehicle down. There seems to be a shift assembly issue. I've only had the vehicle 3 months but this has become a reoccurring issue over the last week.

- Mustang, OK, USA