One problem related to carrier/rack has been reported for the 2015 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Acadia based on all problems reported for the 2015 Acadia.
At just under 1 year old the rack and pinnon went out. Replaced under warranty. Then at just over 3 years old it went out again on top of that for the last 9-12 months the engine will rev up and accelerate on it's own after it will chug for a bit then the sensor stabilitrak warning comes on then it will say traction control off then it will say its back on. I have also had it where it will looses engine power and you can barely get it to go when pushing the gas pedal. It's done this series of events about 10 times. It happens when driving, when in park, and while sitting at a red light. No rhyme or reason to it. But it is pretty unsafe when a vehicle will accelerate on its own driving anywhere! not to mention that a rack and pinnon should not go out 2xs in less than 3 years let alone on a vehicle that cost 45,000+ that was purchased to order brand new! these kind of costly repairs might I mention aren't covered under their power train warranty, though rack and pinnon is part of the steering component. Also this summer at less than 4 years old the ac quit working so I went in 90 degree temps with a baby and no ac until we had a chance to recharge it with refrigerant.