GMC Terrain owners have reported 2 problems related to transmission slip out of gear (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Terrain based on all problems reported for the Terrain.
The transmission failed as I was driving on interstate 4 in orlando florida. The vehicle slipped out of gear and revved as I applied the gas. It slowed and I had to slip it into neutral then back into to drive to get it to catch. Had the vehicle stopped on the interstate it could caused accidents and/or personal injury to me or other drivers. This with just under 70,000 miles on the vehicle. The problem was confirmed by orange Buick GMC service center on west colonial drive in orlando florida, as well as at universal automotive on turkey lake road in orlando florida. As to the inspection by the manufacturer, the closest is orange Buick GMC. There was no advance warning to me that this might happen. Two weeks earlier I had it at orange Buick GMC for regular maintenance.
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While driving on the highway the transmission stopped working and did nothing but rev high rpms. Had to pull over to the emergency lane, at which point I had to turn off the Terrain. Once restarted, the transmission did not shift out of first gear. A month and a half and $3000+ later, a new transmission and 4 computers later, the Terrain is still being worked on! according to many different dealers, this is a common issue on the Terrains, and many have been in the dealerships for the same issue. So why has this not been a recall issue?.