Fault Code P0684
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0684
Glow Plug Control Module to PCM Communication Circuit Range/Performance
This code indicates a range or performance issue in the communication between the Glow Plug Control Module and the Powertrain Control Module (PCM) in diesel vehicles. This suggests that signals are not within expected ranges or communication is unstable.
Part Details
Part Name
Glow Plug Control Module
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪400 - ₪1500
Engine Location
Engine compartment
Symptoms
- Hard starting of a cold engine (diesel)
- Check Engine Light on
- Poor engine performance
- Increased fuel consumption
Possible Causes
- 1Faulty Glow Plug Control Module
- 2Damaged wiring (short or open circuit)
- 3Problem with the vehicle's computer (PCM)
- 4Improper software update
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