P0683 Glow Plug Module Control To ECM Communication Circuit Fault

P0683 Glow Plug Module Control To ECM Communication Circuit Fault

Possible causes
– Faulty Glow Plug Control Module (GPCM)
– GPCM harness is open or shorted
– GPCM circuit poor electrical connection
– Faulty Engine Control Module (ECM)
What about the obd code?
The Engine Control Module (ECM) has detected a communication fault with the Glow Plug Control Module (GPCM) circuit
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of Power
– The engine may be harder to start
– Engine hesitation