Diagnostic Instructions

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This procedure only pertains to the compass display located in the Driver Information Center of the Instrument Cluster. For compass/heading malfunctions of the Onstar system, refer to No Global Positioning System (GPS) Reception (UE1) , or No Global Positioning System (GPS) Reception (without UE1) .

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.