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StartingSeverity Medium: diagnose soon

P0683Glow Plug Control Module to PCM Communication Circuit

What it means

The glow plug module reports problems back to the ECU over a diagnostic line, and that line has a fault (or the module reports an internal fault).

Symptoms

  • Hard cold start
  • Glow plug lamp on

Common causes

  • Faulty glow plug module
  • Wiring fault on the feedback line
  • Failed glow plugs reported by the module

What to check first

  1. Check the module feedback wiring
  2. Measure all glow plugs
  3. Check module supply and ground
Can I drive with P0683? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0683: questions and answers

What does P0683 mean?

P0683: Glow Plug Control Module to PCM Communication Circuit. The glow plug module reports problems back to the ECU over a diagnostic line, and that line has a fault (or the module reports an internal fault).

What are the symptoms of P0683?

Hard cold start. Glow plug lamp on.

What causes P0683?

Faulty glow plug module. Wiring fault on the feedback line. Failed glow plugs reported by the module.

How do you diagnose P0683?

1. Check the module feedback wiring 2. Measure all glow plugs 3. Check module supply and ground

Can I drive with P0683?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.