Visual/Physical Inspection

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for aftermarket devices which could affect the operation of the power sunroof system. Refer to Checking Aftermarket Accessories .
Inspect the accessible system components for obvious damage or for conditions which can cause the symptom.