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StartingSeverity Medium: diagnose soon

P0383Glow Plug Control Module Control Circuit Low

What it means

The circuit the ECU uses to command the glow plug module reads too low a voltage, usually a short to ground.

Symptoms

  • Hard cold start
  • Glow plugs not heating or heating all the time

Common causes

  • Control wire shorted to ground
  • Faulty glow plug control module
  • Connector corrosion

What to check first

  1. Check the control wire between ECU and module
  2. Check module supply and ground
  3. Check whether the module receives the command during pre-glow
Can I drive with P0383? 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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P0383: questions and answers

What does P0383 mean?

P0383: Glow Plug Control Module Control Circuit Low. The circuit the ECU uses to command the glow plug module reads too low a voltage, usually a short to ground.

What are the symptoms of P0383?

Hard cold start. Glow plugs not heating or heating all the time.

What causes P0383?

Control wire shorted to ground. Faulty glow plug control module. Connector corrosion.

How do you diagnose P0383?

1. Check the control wire between ECU and module 2. Check module supply and ground 3. Check whether the module receives the command during pre-glow

Can I drive with P0383?

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