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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2050 (Engine Controls - Diagnostic Subroutines - 6.4L 99R Diesel -- F250-F550 Super Duty) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P0645 - A/C Clutch Relay Control Circuit

P0645 - A/C Clutch Relay Control Circuit

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
P0645 - A/C CLUTCH RELAY CONTROL CIRCUIT

Description:  The powertrain control module PCM monitors the state of the A/C clutch relay control circuit. This diagnostic fails when no voltage is detected on the relay control circuit when the A/C clutch is commanded OFF.
Possible Causes: 
  • A/C Clutch Relay control circuits with high resistance.
  • A/C Clutch Relay or PCM terminals with poor connections.
Diagnostic Aids:  A concern with the A/C clutch relay, relay control circuits, may cause an inoperative or intermittent A/C clutch operation. If the A/C clutch is inoperative when command ON, and DTC P0645 is present, it may indicate that the A/C clutch relay control circuit is either shorted to ground, voltage, or has a high resistance.
All   REFER to the Climate Control System - General Information article to diagnose the A/C system.
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