MasterTuning Fault code dictionary (DTC)

P0380 — Glow plug circuit

Severity: Warning Can you drive? Yes, no known limitation Make: All makes (OBD-II standard)
MeaningThe glow plug supply circuit is not responding as expected. On a diesel in winter you notice immediately; in summer it can go unnoticed for months.
FamilyPowertrain (P)

Typical symptoms

Hard cold starting
White smoke in the first minutes
Rough running until warm
Flashing preheat light

Common causes

One or more glow plugs shorted or open
Faulty glow plug control unit
Corroded wiring or terminals
Faulty preheat relay

What to do

Measure the resistance of each plug: the faulty one shows up in minutes. Replace them as a set, since they are the same age and taking the job apart twice costs more than the plugs — and if they are very old, remove them with the engine warm so they do not snap.

Frequently asked questions

What does code P0380 mean?

Glow plug circuit. The glow plug supply circuit is not responding as expected. On a diesel in winter you notice immediately; in summer it can go unnoticed for months.

Can I keep driving with code P0380 active?

Yes, no known limitation

Common causes — P0380

One or more glow plugs shorted or open Faulty glow plug control unit Corroded wiring or terminals Faulty preheat relay

How do you fix code P0380?

Measure the resistance of each plug: the faulty one shows up in minutes. Replace them as a set, since they are the same age and taking the job apart twice costs more than the plugs — and if they are very old, remove them with the engine warm so they do not snap.

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