Glow Plug Control Module- Implausible Signal
Table of contents
P0684 VOLKSWAGEN Possible Causes
- Faulty Glow Plug Control Module (GPCM)
- GPCM harness is open or shorted
- GPCM circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How do I fix code P0684 VOLKSWAGEN?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0684 VOLKSWAGEN code
The cost of diagnosing the P0684 VOLKSWAGEN code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- The engine may be harder to start
- Engine hesitation
P0684 VOLKSWAGEN Description
The Engine Control Module (ECM) monitors the Glow Plug Control Module (GPCM). The ECM sets the OBDII code when can not communicate with the Glow Plug Control Module.