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 WarningFront End Upper Tie Bar Support Sectioning (MAG Welding)
Note: According to different corrosion warranties, only the
regional mandatory joining methods are allowed.
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.
W ...
Water Hose Test
Note: Use a water hose without the nozzle attached.
Have an assistant inside of the vehicle i 1. n order to locate the leak.
Begin testing at the base of the window or the windshield.
Slowly move the hose upward and across the top of the vehicle.
...
Transmission Messages
SERVICE TRANSMISSION
This message displays if there is a problem with the transmission. See your dealer.
TRANSMISSION HOT — IDLE ENGINE
This message displays and a chime sounds if the transmission fluid in the vehicle
gets hot. Driving with the transmission fluid temperature high can cause dama ...