GMC Pain in the Rear
This bulletin applies to 2007-2013 GMC Acadia vehicles (as well as 2008-2013 Buick Enclave, 2009-2013 Chevy Traverse and 2007-2010 Saturn Outlook).
The power rear liftgate may reverse while closing. The reversal will occur just as the liftgate should latch closed. It is unlikely that any DTCs will be stored.
Current diagnostics could lead to replacing the power liftgate module (LGM) but this may not resolve the concern. It is possible that if the striker is adjusted too far inboard or if the weatherstrip is not fully installed, it could allow the LGM to detect an excess motor current condition and reverse the motor. It is also possible that an out-of-place sill plate could inadvertently contact the liftgate open switch.
1. Remove the liftgate sill plate and cycle the power liftgate closed to see if the concern still exists.
2. Inspect the liftgate weatherstrip seal for being fully installed on the body.
3. Mark the current location of the liftgate striker, loosen the striker bolts and nudge the striker rearward with a mallet to adjust the liftgate striker outboard (towards the rear). Only move the striker in 1 mm incremements, performing the liftgate calibration procedure after each adjustment.
4. NOTE: It is critical for proper liftgate operation that the liftgate calibration procedure outlined in SI document ID# 1864201 is performed every time the striker is adjusted and when any other liftgate repair is performed. If striker adjustment is performed, be sure to verify fit and finish of the liftgate to adjacent panels.