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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1300 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B1023 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 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.
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