For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

California Proposition 65 WarningSelecting a Station
Seek Tuning
If the radio station is not known:
Press SEEK
to automatically search for available
radio stations.
Hold and drag to the left or right of the radio station to automatically search
for available radio stations.
Manual Tuning
Continue pressing TUNE
to manually change the rad ...
Roof Panel Joint Finish Molding Replacement
Roof Panel Joint Finish Molding Replacement
Callout
Component Name
Caution: Refer to Exterior Trim Emblem Removal Caution.
Preliminary Procedures
Begin at the rear edge of the roof panel joint finish molding an ...
Control Solenoid Valve and Transmission Control Module Assembly Programming
and Setup (6T30/6T40/6T45/6T50)
The following service procedures require either a programming or a setup event
be performed for a complete repair. The transmission control module (TCM) is part
of the control solenoid valve assembly, and is not serviced separately.
Transmission Control Module (TCM)
Replaceme ...