Table 1 shows seven common power train related problems of the 2018 GMC Acadia. The number one most common problem is related to the power train (133 problems). The second most common problem is related to the automatic transmission column shift (two problems).
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. Read details...
The contact owns a 2018 GMC Acadia. The contact stated that after shifting into park(p), the gear shift indicator showed the vehicle was in park(p) however, while attempting to turn off the vehicle, the "shift to park" warning light remained illuminated. Read details...
Car would shutter on acceleration. Rpm gauge would jump when accelerating or downshift to pass/climb hill. Dealer found problem with torque converter. Metal through out transmission (see attachment for specifics as noted by mechanic) Read details...