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 WarningSide Object Sensor Programming and Setup
Note:DO NOT program a control module unless directed to by a service procedure or a servicebulletin. If the ECU is not properly configured with the correct calibration software,the ECU will not control all of the vehicle features properly.Ensure the programming tool is equipped with the latest softw ...