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:

California Proposition 65 WarningCollision Damage Repair
If the vehicle is involved in a collision and it is damaged, have the damage
repaired by a qualified technician using the proper equipment and quality replacement
parts. Poorly performed collision repairs diminish the vehicle resale value, and
safety performance can be compromised in subsequen ...
Heated Seat Control Module Programming and Setup
The seat heating control module must be programmed with the proper calibration
software. The module stores and utilizes this information however if it is not properly
configured with the correct calibration software, the seat heating control module
will not control all of the vehicle features ...
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF
in each shift lever position.
For automatic transmission vehicles, the ignition should turn to LOCK/OFF
only when the shift lever is in P (Park).
For manual transmission vehicles, the ignition should turn ...