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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 453 (HVAC System - Manual) >> Diagnostic Information and Procedures >> DTC B1023 >> Circuit/System Description

Circuit/System Description

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This DTC may be set by an open or shorted 5 volt reference circuit to the auxiliary HVAC control module or an internal fault inside the HVAC control module for a stuck or shorted control button.

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