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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 >> P0647 - A/C Relay Control Circuit High

P0647 - A/C Relay Control Circuit High

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.
P0647 - A/C RELAY CONTROL CIRCUIT HIGH

Description:  The powertrain control module (PCM) monitors the A/C clutch relay control circuit. This diagnostic fails when high voltage is detected on the relay control circuit when the A/C clutch relay is command ON.
Possible Causes:  A/C clutch relay control circuit is shorted to voltage.
Diagnostic Aids:  An A/C relay control circuit that is shorted to voltage will cause the A/C clutch to be inoperative. If the A/C clutch is inoperative when command ON, and DTC P0647 is present, the A/C clutch relay control circuit is shorted to voltage.
All   REFER to the Climate Control System - General Information article to diagnose the A/C system.
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