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P064C - Glow Plug Control Module

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
P064C - GLOW PLUG CONTROL MODULE

Description:  This DTC sets by the glow plug control module (GPCM) to indicate an internal software error has occurred.
Possible Causes: 
  • An attempt was made to change the calibration
  • Aftermarket performance products
  • Module programming error
  • Internal GPCM error
Diagnostic Aids:  Disconnect all GPCM connectors and inspect for damage such as pushed out pins or corrosion and repair as necessary. Connect all GPCM connectors.
Clear the DTCs. Carry out the KOER Glow Plug Monitor self-test. If the DTC is retrieved again, turn the ignition OFF and wait for 2 minutes.
Reprogram the GPCM or update the GPCM calibration.
Clear the DTCs. Carry out the KOER Glow Plug Monitor self-test. If the DTC is retrieved again, install a new GPCM.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
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