Diagnostic Aids

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Check the calibration software installed on the liftgate control module prior to performing extensive diagnostics, vehicles with the handsfree liftgate control option (TC2) require specific calibration software. Incorrect calibration software may cause the power liftgate system to become inoperative without setting any DTCs

If the liftgate will not release from the closed position, refer to Opening the Liftgate Without Electrical Power for the appropriate procedure

Power liftgate function will only be allowed if certain operating criteria are met. Any of the following may cause the power liftgate not to function:

Vehicle is not in park
System voltage is below 10.5 V
Engine is cranking
The vehicle doors are locked
A liftgate control module DTC is set
Liftgate motor excess current is detected which may be caused by a misaligned liftgate striker
Interior trim and/or liftgate wedge/bumper misalignment

Whenever the liftgate control module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate control module.