LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1554 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B1023 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Reprogram the HVAC control module that set DTC B1023. The module should successfully reprogram.
    • If the module will not reprogram, replace the HVAC control module that set the DTC.
  2. With a scan tool, clear the DTC.
  3. Ignition OFF.
  4. Wait 60 seconds, then recheck for DTCs. DTC B1023 should not set.
    • If DTC B1023 sets, replace the module.
scientia non olet · About LEMON Manuals