Air Conditioning Clutch Relay Circuit Malfunction
Table of contents
P0645 MERCURY Possible Causes
- Faulty Air Conditioning Clutch Relay
- Air Conditioning Clutch Relay harness is open or shorted
- Air Conditioning Clutch Relay circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How do I fix code P0645 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0645 MERCURY code
The cost of diagnosing the P0645 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0645 MERCURY Description
The Powertrain Control Module (PCM) monitors the Air Conditioning Clutch Relay (A/CCR) circuit. The Diagnostic Trouble Code (DTC) when the PCM grounds the Air Conditioning Clutch Relay circuit, excessive current draw is detected on the Air Conditioning Clutch Relay circuit; or, with the Air Conditioning Clutch Relay circuit not grounded by the PCM, voltage is not detected on the Air Conditioning Clutch Relay circuit (the PCM expects to detect VPWR voltage coming through the Air Conditioning Clutch Relay coil to the Air Conditioning Clutch circuit). The PCM detects an open or short exists in Air Conditioning Clutch Relay control circuit.