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DTC P0670: Glow Plug Control Module (GPCM) Control Circuit/Open

DTC P0670: GLOW PLUG CONTROL MODULE (GPCM) CONTROL CIRCUIT/OPEN

Description:  The powertrain control module (PCM) carries out a functional key ON, engine running (KOER) self-test for the glow plug system. During that test the PCM enables the GPCM which monitors glow plug control circuit for concerns. When the GPCM detects a concern with a glow plug control circuit, it sends a message to the PCM, which sets this DTC.
Possible Causes: 
  • Glow plug control circuit open in the harness
  • Glow plug control circuit short to ground in the harness
  • Glow plug control circuit short to voltage in the harness
Diagnostic Aids:  Check the wiring harness for an open or a short circuit.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST AF .
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