Two problems related to alternator/generator/regulator have been reported for the 2007 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 GMC Acadia based on all problems reported for the 2007 Acadia.
Trans went out shortly after purchase, alternator went out shortly after purchase, needed new wave plate, needed new alternator, sun roofs leak water through the interior lighting and down both a-posts. Continues to run after shut off and key removed. Slips gears, will not upshift.
Lost power steering and alternator stopped charging during more then one rain storm. The serpentine belt gets wet and slipped because it's exposed to the element from the right front wheel well.