DTC Descriptor
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic procedure supports the following DTCs:
- DTC P0645 The PCM/ECM detects an open on the control circuit of the A/C compressor clutch relay.
- DTC P0646 The PCM/ECM detects a short to ground on the control circuit of the A/C compressor clutch relay.
- DTC P0647 The PCM/ECM detects a short to voltage on the control circuit of the A/C compressor clutch relay.