Liftgate Calibration (Except Avalanche and EXT Escalade): Notes
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
To ensure proper calibration of the liftgate, the liftgate (if equipped) must be completely closed and the liftgate assembly must be at room temperature during calibration.