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P0645

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P0645 OBD-II Trouble Code: A/C Clutch Relay Control Circuit
P0645 means there is an issue within the A/C clutch relay control circuit often due too a defective A/C compressor driver or control relay.

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Question
I got a 05 pacifica and the head gaskets were bad so I changed them. I put it back together and changed oil and now it won't start.
Hi there. The codes are coming up for the Oxygen Sensor, Oil Pressure Sensor, Evaporative Emission System Vent Valve, and the Air Conditioning Clutch Relay. Since all of these conditions are separate circuits and in different locations, I suspect that...

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