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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 225 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B1023 >> Circuit/System Verification

Circuit/System Verification

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  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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