P0684
Powertrain Codes
P0684 - VOLKSWAGEN - Glow Plug Control Module- Implausible Signal
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Lack/Loss of Power - The engine may be harder to start - Engine hesitation
Possible Causes
- Glow Plug Control Module open circuit - Glow Plug Control Module short to ground or power - Faulty GPCM - ECM fault