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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 866 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC P0646 or P0647 >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0646 or P0647

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
A/C Relay Coil B+ P0646 P0647 P0647 -
A/C Compressor Clutch Relay Control P0646 P0647 P0647 -
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