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 WarningInflatable Restraint Sensing and Diagnostic Module Programming and Setup
Special Tools
EL-49642 SPS Programming Support Tool
For equivalent regional tools, refer to Special Tools.
Note:
DO NOT program a control module unless directed to by a service procedure
or a service bulletin. If the ECU is not properly configured with the correct
calibration ...
Floor Rear Air Outlet Duct Replacement - Left Side
Floor Rear Air Outlet Duct Replacement - Left Side
Callout
Component Name
Preliminary Procedure
Remove the floor panel carpet . Refer to Floor Panel Carpet Replacement.
1
Floor Rear Air Outlet Du ...
Drive Range, First Gear Engine Braking (Gen 1)
When the gear selector lever is moved to the Drive (D) range from the Neutral
(N) position, the transmission will provide engine braking. In this operating range,
the normally-low 1234 pressure control solenoid 5 is commanded ON and, in the engine
braking mode, the following changes occur with ...