Error code

OBD2 P0683

OBD2P0683
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Glow Plug Control Module to PCM Communication Circuit.

Severity

moderateCan drive, but starting issues may occur especially in cold weather.

Summary

P0683 indicates a communication failure between the glow plug control module and the PCM in diesel engines. This issue affects the ability of these components to exchange necessary data for proper engine operation.

Symptoms

  • Check Engine Light is on
  • Engine difficulty starting, especially when cold

Common Causes

  • Damaged or disconnected wiring between the glow plug control module and PCM
  • Corroded connectors in the communication circuit
  • Use of substandard aftermarket parts
  • Defective glow plugs
  • Low battery voltage
  • Blown fuses or fusible links

Diagnosis

  1. Inspect and test the glow plug control module wiring and connectors for damage or corrosion.
  2. Check battery voltage to ensure it is within normal range.
  3. Verify that all fuses and fusible links are intact and functioning properly.
  4. Test individual glow plugs for proper resistance.

Fixes

  • Repair or replace damaged wiring and connectors in the communication circuit.
  • Replace any defective glow plugs.

FAQ

What does P0683 mean?

P0683 indicates a communication issue between the glow plug control module and PCM, which is critical for diesel engine starting.

How do I fix P0683?

Fixing P0683 involves repairing or replacing damaged wiring/connectors and ensuring all components like glow plugs are functioning correctly.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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