One problem related to transmission not go into gear has been reported for the 2012 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 GMC Acadia based on all problems reported for the 2012 Acadia.
The engine misses and has severe carbon buildup on the valves. The intake boot and intake manifold are covered in oil residue from the breather tube for the motor. The transmission started having issues at 100k. It hesitates, shutters, and fails to change gears while driving at highway speeds. The transmissions are a known issue and I dont understand how this is not a recall.