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StartingSeverity Medium: diagnose soon

P0384Glow Plug Control Module Control Circuit High

What it means

The circuit the ECU uses to command the glow plug module reads too high a voltage, usually an open circuit.

Symptoms

  • Hard cold start
  • Glow plugs not heating

Common causes

  • Open control wire
  • Faulty glow plug control module
  • Connector corrosion

What to check first

  1. Check the control wire for continuity
  2. Check module supply and ground
  3. Scope the command signal during pre-glow
Can I drive with P0384? 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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P0384: questions and answers

What does P0384 mean?

P0384: Glow Plug Control Module Control Circuit High. The circuit the ECU uses to command the glow plug module reads too high a voltage, usually an open circuit.

What are the symptoms of P0384?

Hard cold start. Glow plugs not heating.

What causes P0384?

Open control wire. Faulty glow plug control module. Connector corrosion.

How do you diagnose P0384?

1. Check the control wire for continuity 2. Check module supply and ground 3. Scope the command signal during pre-glow

Can I drive with P0384?

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