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Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

If there are any DTCs set for GMLAN communication such as U0100, U0121, U0140, or U2099 or the antilock brake control system, diagnose them first before to resolve DTCs described in this section.

Check for Brake Pressure Sensor and/or Wheel Speed Sensor DTCs in EBCM. Follow EBCM circuit repair procedure. If no DTCs are found in EBCM check for ground differential between EBCM and TBCM, loose TBCM ground, loose GMLAN signal terminal pins at TBCM or source of electromagnetic interference that may result from installation of aftermarket equipment

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