The contact owns a 2017 GMC Acadia. The contact stated while driving at an undisclosed speed, the transmission unexpectedly downshifted, with the shift to park message was displayed. The contact attempted to restart the vehicle, but the vehicle failed to shut off when the contact attempted to engage the parking brake. The contact forcefully engaged the parking brake to shut off the vehicle. The vehicle was taken to the dealer where it was determined that the transmission failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHSTA Hotline for assistance. The failure mileage was approximately 13,000.

- Indianapolis, IN, USA

Violent shifting in the transaxle when vehicle is shifting between lowers gears. Transaxle causing a shuddering vibration on inclines. It feels like the engine is misfiring, but it is the torque converter/transmission/transaxle failing.

- Arroyo Grande, CA, USA

Many times after shifting the car into park, a message is displayed saying that the car needs to be put in park. It takes many time of turning the car on and off and moving the shift back and forth in order to get the message off and get the car to shut off. I notice that some 2017 and 2018 Acadia models have received recall notices addressing this problem. Our VIN number does not show up in the recall notices. Is there a reason why our car would not be covered as we have the same issue as cars that have received recall notices. Any help that you could provide would be very much appreciated. It is a very frustrating problem.

- Chaska, MN, USA

The contact owns a 2017 GMC Acadia. The contact stated that after parking the vehicle and shifting to park(P), the vehicle failed to shut off when the START/STOP button was pressed. The cause of the failure was not yet determined. The manufacturer and local dealer were contacted regarding the failure, but no assistance was offered. The failure mileage was 36,000.

- Warren, OH, USA

I was traveling at the posted speed limit of 80 mph on [XXX] in South Dakota at [XXX] and the GMC Acadia was working without any issue when all of a sudden various warnings flashed on the dashboard with one of them being power saver mode engaged. Within about 3 minutes various other warnings flashed and the vehicle motor turned off along with all of the electrical systems. Luckily, I was able to maneuver the GMC Acadia to the shoulder of the highway safely. The vehicle would not start and for about a minute or so we were trapped in the Acadia. We could not unlock the doors or wind down the windows until I pressed the start/stop bottom several times. Onstar did not work either. Once we could get out of the Acadia, my wife called 911 and in roughly 20 minutes or so, a police officer arrived at our location. We also called AAA and had a tow truck take the broken down GMC Acadia to a garage for repairs. It turns out that the alternator went bad and rendered our GMC Acadia useless in roughly 3 minutes from the initial warning. There was absolutely none of the tell tale warnings of a bad alternator. We did not see or observe any dim lights, hesitating starts or any other things associated with a bad alternator prior to the 3 minute warning before the vehicle completely was inoperable. We are very lucky to be alive. If [XXX] was more congested with traffic at the time of this incident, we might have been serious injured if not killed. IMO this GMC Acadia is a death trap. This vehicle warns the driver when the key fob-??s battery is low many weeks before it needs to be replaced. It should warn you more than 3 minutes if not several hours prior to the vehicle being completely immobilized. It should be noted that the check engine light came on several hours before this incident and I called Onstar and they ran the diagnostics and returned a P0420 code which is related to emissions. The check engine light turned itself off about 1 hour before incident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMAT

- Mount Joy, PA, USA

For over 2 years now I continue to receive "shift to park" message when I am already in park and trying to turn off vehicle. I can't shut off and have to shift to reverse and/or drive then back to park several times or shove the gear shift towards park for it to finally detect I am in park. I have been setting parking brakes out of fear vehicle will roll due to this issue. Yet, even with all my maintenance, if it doesn't happen during oil change or tune ups dealer nor repair shops aren't diagnosing and issue.

- Charlotte, NC, USA

I don-??t know specifically what component but feels like drive stuff. Yes it is available for inspection upon request. Driving during acceleration while entering highway vehicle started to surge or shutter almost total loss of vehicle acceleration and slowed down almost causing the vehicle behind me to hit rear of my vehicle. Mechanic says transmission issue and can be reproduced at times. Symptoms are gradually getting worse. No light other than tire pressure sensor.

- Jacksonville, FL, USA

This model is know for transmission shudder and you put out a memo. I brought the car back under warranty and said it was fine. Now it needs what the memo said and torque converter. Car is out of warranty and they want to charge full price. There should be a recall on this model

- Beacon Falls, CT, USA

2017 GMC Acadia "shift to park" known failure. When you place the vehicle in the park position, mechanically it seems to be in park but the control says shift to park. When traveling long distance from home you can find yourself in a position where you cannot leave your car. You cannot lock it or turn it off properly. This is an ongoing problem known to GM and listed in many Technical bulletins including Bulletin No. 19-NA-206 date September, 2019. A recall should be issued for this problem. We found ourselves stranded hundreds of miles from home with a vehicle we could not shut off or secure. This may cause you to leave your car unattended, unlocked and running if you cannot get it to park and shut down.

- Pasadena, MD, USA

Car displaying "shift to park" when in park. This has already been addressed once during my ownership. The Shifter Assembly was replaced. Car will not turn off with "shift to park" alert. It is now doing it again. This is a well known issue.

- Woodstock, GA, USA

Incident: the drivetrain shudders and experiences hesitation while attempting to accelerate, and car surges forward when breaking due to what seems to be an issue with the tranmission. This present concerns with potential stalling while driving or the car surging into other vehicles. No indicator lights or error codes are displayed. The presence of this problem in multiple GM vehicles is confirmed by service bulletin 18-NA-358. The safety concern related to this defect should warrant a manufacturer recall to fix the know n defective parts. The vehicle has not yet been repaired. Will request to retain defective parts for inspection upon repair.

- Chesterfield, MO, USA

The contact owns a 2017 GMC Acadia. The contact stated that upon reaching her destination and shifting the vehicle to park, the vehicle failed to recognize that the gear shifter was in park(P). As a result, the vehicle displayed a warning message reading, "Action Required - Please Shift to Park, " and the contact was unable to lock the doors until the failure was resolved independently. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 44,000.

- Chillicothe, OH, USA

Vehicle frequently shows the error "Shift to Park" when I attempt to turn off the car after it is placed in park - which is confirmable via the instrument panel. The vehicle electronics will not turn off until the error is cleared. At times I cannot clear the error and I've had to set my parking brake and leave the car electronics running while I go into a store, which leaves car unsecured and drains the battery. The car has gone into my local GMC dealer for repairs. The first time I took it in (August 2020), I was 365 miles outside my warranty and GMC refused to pay for the repairs. The dealership felt certain a recall would be issued and suggested I have harness switched which they admitted was a band-aid fix and that it wouldn't fix the issue, but it would allow a period where the error disappears (which it did) - until a recall is issued. The Shift to Park error reappeared about 1.5 years later. I took my Acadia back to the dealership and was told they could not replicate the error and therefore there was nothing they could about it. The error is happening much more often and I've scheduled another repair appointment to address the problem.

- Jacksonville, FL, USA

There's a shuddering, clanking sound coming from the torque converter when the engine shifts gears at 25-35 mph. I also noticed that it happens when it transitions from 4 cylinders to 6 cylinders. There's a sweet spot somewhere in there. It has also happened on the highway from 65-75 mph. This also happens when it's switching from 4 cylinders to 6 cylinders.

- Collinsville, OK, USA

There is a big time shudder and the dealer will not believe me because it doesn-??t do it for them. They did admit there is a problem but won-??t fix it. I did the transmission fluid exchange like they said and still the problem. I see service bulletins for it but no recall. It-??s is now out of warranty and I will have to pay for it. This is not right

- Beacon Falls, CT, USA

The contact owns a 2017 GMC Acadia. The contact stated while driving 20 MPH and accelerating to 25 MPH, the vehicle jerked and downshifted, and decelerated to 17-18 MPH. The contact stated that the failure occurred several times while driving. Additionally, the contact stated while driving 5 MPH and attempting to come to a complete stop, the brake pedal was depressed, but the vehicle shuddered and failed to respond. The check engine warning light was illuminated. The contact depressed the brake pedal harder, and the vehicle responded. The contact stated that the failure had been recurring while driving, causing him to shift to neutral(N) while depressing the brake pedal. The vehicle was taken to an independent mechanic, where the diagnostic test codes: P0010, P0016, P0018, and P0507 were retrieved. The mechanic determined that the engine and an unknown part needed to be replaced. The vehicle was not repaired. Two unknown dealers were notified of the failure and informed the contact the VIN was not included in a recall. The manufacturer was not notified of the failure. The failure mileage was approximately 75,000.

- Holmdel, NJ, USA

I have a 2017 GMC Acadia with what I call a "Shift to Park" issue. This originally showed up with about 27, XXX miles on the car. It was repaired by the dealer on 9/25/2019. It worked perfectly until it started back up about six weeks or so ago with approximately 57, XXX miles on the car. I was told when it was originally fixed that they knew the issue and had an earnest fix. Not they want >$500 to fix a problem that they were supposed to fix the first time. Here is the issue. When you shift to park, and try to turn the car off, you get an error message that you need to "shift to park". I assume that the car is in park, but not sure with this warning message. You have to start it back up multiple times and play with the shifter. The other option is to let the warning keep flashing and wear the battery down. I have replied the battery on this car two times. When researching this issue on the internet, I see that there are several class action lawsuit for this issue so GM is well aware of the issue. They have apparently figured out the issue because it only affected the 2017 and 2018 Acadias from what I can tell. AS you can tell fro the mileage, this car has low annual miles and ha always been serviced by a GM dealer.

- Cape Coral, FL, USA

This is a known issue with GM 2016-2019 various models including my 2017 Acadia. the shift mechanism does not know that it is in Park position and so indicates "shift to park" on dashboard lights. Therefore ignition switch stays on and accessories that are on will run battery down in a couple of hours. Sometimes the engine will not cut off until you turn it on and off many times. The dealer estimates cost to fix of between $500 and $700. They want an additional $125 for diagnosis, which they already know problem. I found the Service Bulletin on it (19-NA-206) which calls for $42.43 in parts and 1.4 hrs labor. Many people are being ripped off on this problem, which should be a manufactor's recall ! They continued to use defective parts for years after they were aware of this hazard. Please HELP ! I don't think that I should have to pay for this repair!

- Hot Springs Village, AR, USA

My Wife and I purchased the 2017 GMC Acadia All Terrain in August 2017. It always had some low gear hard engagement issues. It also had issues of not locking into park when placing in Park. If we released and re-shifted it would engage. On two occasions we had the GMC dealership Durand GMC Leominster MA. check the transmission. Around 34,000 miles and again around 55,00 0 miles On both occasions they claimed they could not recreate the incident I complained about. I told them I believed that to be impossible as it was common, especially going up hill. The service manager was adamant that their was no issue. As I was close to my powertrain warranty expiring I asked again with the same response. In May we started having serious transmission slippage, It became dangerous so we took it to Durand and they found a hole in a fluid tube caused by wear from a support clip. Their repair cost was high, I took it to a respected mechanic. He repaired the tube, unfortunately, the slipppage got worst and we will replace the transmission. My internet research shows many incidents like mine. I want to make it known that my vehicle concerns were swept under the rug. GMC repair video link Please watch the video of YOUR vehicle at this website: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Gardner, MA, USA

The shifter does not always engage and the car will remain in gear and can't be turned off. The safety issue is the vehicle rolls forward and backwards at times. I have hit my riding lawnmower under my carport because it continued to roll when in park. I have reported an issue in 2018 and in August 2019 a repair was performed and again in 2019 a gear shift assembly was replaced, It has been confirmed there is an issue with the shifter by a tech servicing my car when he drove it. It is at the dealer now 07-24-2023 to determine the issue and repair. Shift to park will come on inconsistently, however it will roll forward without the message.

- Prescott, AR, USA