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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647: Air Conditioning (A/C) Compressor Clutch Relay >> Conditions for Setting the DTC

Conditions for Setting the DTC

P0645 or P0646 

The ECM detects a short to ground or an open at the A/C compressor clutch relay control circuit.

P0647 

The ECM detects a short to voltage at the A/C compressor clutch relay control circuit.

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