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 WarningInstallation Procedure
Position the front brake shield (2) and front wheel bearing/hub (1)
assembly in the steering knuckle.
Caution: Refer to Fastener Caution in the Preface section.
Install the NEW front wheel bearing/hub bolts (1).
Tighten the bearing/hub bolts (1) in 3 passes. Use the EN-45059 k ...
Transmission
Driver Shift Control (DSC) allows the automatic transmission to be shifted similar
to a manual transmission.
Electronic Range Select (ERS) allows for the selection of a range of gears.
Up-Shift Light
If the vehicle has a manual transmission, it will have an up-shift light that
indicates whe ...
Overheated Engine Protection Operating Mode
This emergency operating mode allows the vehicle to be driven to a safe place
in an emergency situation. If an overheated engine condition exists, an overheat
protection mode which alternates firing groups of cylinders helps prevent engine
damage. In this mode, a significant loss in power and ...