Diagnostic Instructions (Communication Interface Module)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2009 GMC Yukon XL, 2009 GMC Yukon, 2009 Chevrolet Tahoe, 2009 Chevrolet Suburban, and 2009 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Perform the Diagnostic System Check - Vehicle (with HP2) or Diagnostic System Check - Vehicle (without HP2) 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.