One problem related to manifold/header/muffler/tail pipe has been reported for the 2011 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 GMC Acadia based on all problems reported for the 2011 Acadia.
Stopped at stop sign making right turn excellerate to 10-15 mph notice gargling sound or like a muffler explodes power reducted. . . With in a hundred yards or so engine light go on power (engine) failure not breaks or stearing available coast to curb try to start vehicle again. . . Dead as a door nail. Flat bedded to kerbeck GMC dealership by 1:00pm 09/12/16 . . . Service mgr. Call at 6pm no news still being diagnosed, will call in the am. . . Later that day called to tell me that it sucked a valve and has broken rocker assembly and seems to be damage in the lower end of the motor! need new engine. . . Vehicle is in the hands of the dealer! no written report has be given to me, just verbal! passange in vehicle at time of occurance. . .