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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 311 (HVAC System - Manual) >> Diagnostic Information and Procedures >> DTC P0645 >> Conditions for Setting the DTCs

Conditions for Setting the DTCs

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The ECM detects an open on the control circuit of the A/C compressor clutch relay when commanded OFF with the engine in crank or run status.

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