Engine-Codes - Ford - P0645 2000 Ford F150

P0645 2000 Ford F150 Code - Wide Open Throttle A/C Cutout Primary Circuit Malfunction

- Code Popularity: 2,305 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0645 2000 Ford F150?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Air Conditioning Clutch Relay
  • Air Conditioning Clutch Relay harness is open or shorted
  • Air Conditioning Clutch Relay circuit poor electrical connection
  • Damaged PCM

Code Tech Notes

For applications that use a normally open relay to control the A/C clutch, the following description applies to the A/C clutch relay control circuit.
Monitors the wide open throttle A/C cutoff (WAC) circuit output from the PCM. The test fails if: When the PCM grounds the WAC circuit, excessive current draw is detected on the WAC circuit; or with the WAC circuit not grounded by the PCM, voltage is not detected on the WAC circuit (the PCM expects to detect VPWR voltage coming through the WAC relay coil to the WAC circuit).

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How to Fix the DTC P0645 2000 Ford F150?

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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0645 2000 Ford F150 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

The P0645 code is stored if an open or short exists in A/C clutch relay control circuit.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P0645 2000 Ford F150 Code Mean?

A/C clutch relay may also be referred to as A/C compressor clutch relay. A/C clutch relay circuit is monitored when ignition is on and battery voltage is greater than 10.4 volts.

P0645 2000 Ford F150 Code - Wide Open Throttle A/C Cutout Primary Circuit Malfunction

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