37 problems related to power train have been reported for the 2018 GMC Terrain. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 GMC Terrain based on all problems reported for the 2018 Terrain.
First issue with the vehicle was a separation of the dash near and around the passenger side airbag. Unknown at this time if the airbag has been compromised. I won't know until the vehicle would be involved in an accident. The second issue involves the vehicle while in park. I am able to push the vehicle and it will actually move forward. There is also a very hard shift while the vehicle is in motion. This occurs usually between 2k and 3 k rpms. The vehicle will actually jerk as it is trying to shift.
Stopped at a light to make a left turn. The vehicle jerked, then shifted from drive to park. The info system gave me the following messages: transmission, stabilitrak and parking assist. I turned the vehicle off and tried to restart it. I got a message that said "this vehicle is unsafe to drive. :" at this time non of the gear options were available. A roseville, michigan police officer had to position herself behind me becsuse cars were going around me on both sides (my four way blinkers were on). The tow truck driver was unable to put the vehicle in neutral, thus my vehicle had to be dragged onto the truck. At the dealer they were unable to change gears and once again my vehicle was dragged off the tow truck prior to this incident. I reported to the dealer the rocky, bouncy, pulling ride which made the vehicle hard to control. I also reported the jerking while driving and in the auto stop. Despite all of my verbalizations of the concerns, they, wrote the work orders in dealer language and only addressed what they wanted.