P0684 Honda Glow Plug Control Module- Implausible Signal
Possible causes
– Faulty Glow Plug Control Module (GPCM)
– GPCM harness is open or shorted
– GPCM circuit poor electrical connection
– Faulty Engine Control Module (ECM)
– GPCM harness is open or shorted
– GPCM circuit poor electrical connection
– Faulty Engine Control Module (ECM)
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of Power
– The engine may be harder to start
– Engine hesitation
– Lack/Loss of Power
– The engine may be harder to start
– Engine hesitation
Honda Vehicle:Honda Accord,Honda Civic,Honda Crosstour,Honda CR-V,Honda CR-Z,Honda Element,Honda Fit,Honda Insight,Honda Odyssey,Honda Pilot,Honda Ridgeline,Honda Accord Crosstour,