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:

Vehicle Care
California Proposition 65 WarningBackup Lamp Replacement
Preliminary Procedures
Remove the rear compartment sill trim plate. Refer to Rear Compartment
Sill Trim Plate Replacement.
Disconnect the electrical harness connector from the backup lamp socket.
Back Up Lamp Nut (Qty: 4)
Caution: Refer to Fastener Caution in the Preface ...
Object Detection System Messages
PARK ASSIST OFF
This message displays when the park assist system has been turned off or when
there is a temporary condition causing the system to be disabled.
SERVICE PARK ASSIST
This message displays if there is a problem with the Ultrasonic Rear Parking
Assist (URPA) system. Do not use thi ...
Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the
Preface section.
Warning: Refer to Collision Sectioning Warning in the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section
Disable the SIR System. Refer to SIR   ...