Engine-Codes - Ford - P0645 1997 FORD F150

P0645 1997 FORD F150 Code - Wide Open Throttle A/C Cutout Primary Circuit Malfunction

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3
Table of contents

|P0645 1997 FORD F150 code possible 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

|How is the P0645 1997 FORD F150 code repair?

Start by checking 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.

|P0645 1997 FORD F150 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).

|What is the cost to diagnose the P0645 1997 FORD F150 code

Labor: 1.0

The cost to diagnose the P0645 1997 FORD F150 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0645 1997 FORD F150 code detected?

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

|What are P0645 1997 FORD F150 code possible symptoms?

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

|What is P0645 1997 FORD F150 code meaning?

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.

|Need more information with the P0645 1997 FORD F150 code?

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|Need help with a P0645 1997 FORD F150 code?

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