Diagnostic Aids
WARNING: This page is about a different car, the 2021 GMC Sierra 3500 HD and 2021 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The programming steps in the Service Programming System (SPS) screens may not be in functional order. It is mandatory to follow the programming steps in the order listed below. The steps must be completed for the Instrument Cluster to be fully functional. Reversing the order or completing only one step could cause the Instrument Cluster to malfunction. If the steps are completed in an incorrect order, performing the steps in the proper order will correct the malfunctions.