2018 GMC Acadia

The contact owns a 2018 GMC Acadia. The contact stated that upon parking the vehicle and attempting to turn off the vehicle, the message "Shift to Park" was displayed while the gear shifter was in park(P). The contact parked the vehicle and turned off the vehicle after several attempts. The contact related the failure to an unknown recall; however, the VIN was not under recall. The dealer and the manufacturer were not contacted. The vehicle was not diagnosed or repaired. The failure mileage was approximately 149,000.

Vehicle warning light, and noise alerts when placing in park. Vehicle does not register PARKED. Vehicle has to be restarted several times and shifter moved in and out of park until registers as parked. When viewed by mechanic, it was stated there has been a recall to contact manufacturer about recall, but none noted on site.

Car does not turn off, says “Shift to Park” but car already is in park and car won’t turn off.

The contact owns a 2018 GMC Acadia. The contact stated that while shifting into park(P), the gear shift indicator failed to display that the vehicle was in park(P) on the instrument panel, even though the vehicle was in park(P). The gear shifter was shifted continuously until the gear shift indicator recognized that the vehicle was in park(P) on the instrument panel. No warning lights were illuminated. The vehicle was taken to the dealer, but was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 21,000.

Vehicle dies with no warning, no warning lights, no power even emergency flashers are inoperative, almost like it got hit by an EMP

Dear General Motors Customer Assistance Center, I am writing to formally file a complaint and request assistance regarding a serious mechanical failure with my 2018 GMC Acadia SLT. I purchased this vehicle when it had approximately 7,000 miles on it after it was transported from Florida. Since owning the vehicle, I have properly maintained it and had it serviced through Suttle Motors dealership in Newport News, Virginia. Recently, while driving on the highway to have tires installed, the vehicle suddenly stalled while I was in traffic. This caused a very dangerous situation, as traffic behind me was forced to abruptly slow down and I was nearly rear-ended due to the sudden loss of power. Because the vehicle was no longer drivable, I had it towed to Suttle Motors for inspection. After examining the vehicle, the service department informed me of the following issue: “The transmission solenoid valve is stuck and it has burnt the transmission fluid. The vehicle will require a full transmission replacement. The estimated cost is $7,769 with a 3-year/100,000-mile warranty.” I was extremely shocked and disappointed to receive this news. My vehicle currently has only 67,000 miles, and I have taken care to maintain it properly through the dealership. Experiencing a complete transmission failure at such relatively low mileage is very concerning, especially considering the dangerous situation it created on the highway. Given the circumstances, I am requesting that General Motors review this matter and advise whether any goodwill assistance, repair support, or coverage options may be available to help resolve this issue. I would greatly appreciate your prompt attention to this matter. I can provide service records and documentation from Suttle Motors if needed. Thank you for your time and consideration. I look forward to your response.

2018 GMC Acadia comes up with an error message "shift to park" and does not allow me to fully engage my car into the parked position when stopped and parking.

The contact owns a 2018 GMC Acadia. The contact stated that while starting the vehicle and attempting to shift into park, the vehicle failed to recognize that the transmission was in park(P). There was no warning light illuminated. The contact stated that several attempts were required to shift the vehicle into park(P) to turn off the vehicle. The contact further stated that on other occasions, the vehicle remained stuck in park(P) and failed to shift into drive(D). The contact related the failure to TSB: 19-NA-205. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure, and a case was opened. The contact was referred to the NHTSA Hotline to report the failure. The approximate failure mileage was 120,000.

Gear shifter will not go into park.

Car will not shift into park therefore I cannot turn the car off without disconnecting the battery. Dangerous bc you don’t know if the car is in park or not when you have to get out and stand in front of car to life hood and disconnect battery.

Shift to park message has appeared again and the engine will not cut off. First happened in Feb 2020, mileage was 31,143. Took to Dealer and new wiring harness was installed. Had to take back to dealer April 2020 for same problem; shifter assembly was replaced at that time. Shift to park message came back on August 2023. Took back to Dealer and shifter harness replaced again and jumper harness was installed. Mileage was 52,993. Shift to park message has once again appeared, December 2025. Having to put car in park and push engine on/off button numerous times before engine will finally shut off.....sometimes having to unhook battery in order to kill the engine. This will be the fourth time we have had the same recurring issue repaired. My husband read through over half the 352 registered complaints and at least three fourths of them were all about the SHIFT TO PARK problem! As a female, I don't feel safe driving my Acadia not knowing if the engine will cut off or if it's actually in park or if the car will roll. Why can't GM fix this issue!!!!!! They should definitely be held accountable instead of ignoring the complaints!

My car says Shift to park when I try to turn it off. Leaving my battery to drain.

"STEERING ASSIST IS REDUCED" This message appears on the instrument panel once in a while, and I have to get a mechanic to reset it. Many other people who drive the 2018 GMC Acadia, are reporting the same problem. This occurs so frequently on this model, that it obviously was a manufacturing design flaw.

SHIFTER PROBLEM 2018 GMC ACADIA. I NEVER RECEIVED A RECALL NOTICE OR BULLETIN ABOUT SHIFT TO PARK SHIFTER PROBLEM

I continue to get a message "Steering assist is reduced drive with care " this appears to be a very common issue with my vehicle model. it is very expensive to fix. I am just outside of warranty so it is not covered. Online indicates this is so common. It is the vehicle thermostat and sensor prematurely going bad

The contact owns a 2018 GMC Acadia. The contact stated that while the vehicle was parked and occupied, the shift to park message was displayed while the vehicle was in park. Neither an independent mechanic nor the dealer was contacted. The vehicle was not taken to an independent mechanic or dealer for diagnostic testing. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number:17V516000 (POWER TRAIN); however, the VIN was not included in the recall. The manufacturer was notified of the failure and informed the contact that the VIN was not included in the recall. The failure mileage was 113,000.

The contact owns a 2018 GMC Acadia. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate while attempting to shift gears. The contact stated that the vehicle jerked and made an abnormal sound, with the check engine warning light illuminated. Additionally, the contact stated there was black and white smoke coming from the rear of the vehicle. The vehicle was taken to the dealer, where it was diagnosed with transmission, cooling system, and fuel system failures. The dealer also determined that the engine was leaking oil. The dealer informed the contact that the vehicle required several repairs. The vehicle was not yet repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 126,000.

URGENT SAFETY DEFECT — RECURRING “SHIFT TO PARK” — ROLLAWAY RISK Vehicle: GMC Acadia | ~99,684miles Same defect repaired FREE under GM goodwill in 2021 (shifter replacement, TSB 19-NA-206) after 4 failed attempts. Now FAILED AGAIN in 2025 — vehicle will not shut off, drains battery, risks unintended rollaway. GM dealer refuses repeat coverage despite prior admission of defect. This is a KNOWN DESIGN FLAW — thousands of complaints — NO RECALL. DEMAND IMMEDIATE SAFETY RECALL — this is a fire/rollaway hazard. Attached: 2019- 2021 repair order ($0), TSB 19-NA-206, prior NHTSA complaint, previous TAC CASE: 9-6623251184.

I have owned this vehicle less than 5 years and it has had the "Shift to Park" error 3 times and has now been replaced 3 times. The 2nd time was in August 2023 and yesterday it had to be replaced again. I don't understand how a part can fail this rapidly when the vehicle is only being driven approximately 10,000 miles per year. It only has 82,445 miles. I would like for GM to issue a recall for this issue or advise who the manufacturer is of the Switch part number 84955381 and Harness part number 84733196. The parts are not that expensive but the labor to replace was $ 462.50 and total parts was $ 55.56 on the invoice yesterday. As this is an ongoing issue I would like reimbursement. I am widowed and living on one income.

Stabikitrack error causes ABS to trigger while on the highway. Brought in for repair at dealer and needed new wheel sensor and EBCM, significant safety issue!