Action Taken When the DTC Sets
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
P0645 or P0646
- The air conditioning compressor is inoperative.
- DTC Type C
P0647
- The air conditioning compressor clutch is always ON. The air conditioning compressor solenoid is commanded to 0% displacement. This causes warm air from the ducts, even with unwanted clutch engagement.
- DTC Type C