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 WarningDiagnostic Repair Verification
Note:After a repair has been made, some DTCs require the ignition to be turned OFF thenback ON before the scan tool function will clear the DTC.Ignition OFF.Install any components or connectors that have been removed or replaced during diagnosis.Perform any adjustment, programming or setup procedure ...