Generic fault code

P0381 — Glow plug/heater indicator, control circuit open

Q: What usually causes code P0381?

Faulty actuator, motor, coil or solenoid. Damaged, chafed or pinched wiring. The most likely causes come first. Only a check on the car confirms which one is yours.

Q: What are the symptoms of code P0381?

Hard starting from cold. White smoke or a rough engine for the first few seconds. The glow plug light flashing or staying on. These are the usual symptoms of this kind of fault: not all of them always appear, and sometimes you notice nothing.

The control unit stores code P0381 when it detects this fault: “Glow plug/heater indicator, control circuit open”.

Indicative severity: LowElectrical system (12 V, starting and charging)

Updated on October 13, 2026

Reviewed by Daniel Morales, founder of Reprorace SL, on October 13, 2026

What does code P0381 mean?

The battery, charging and the 12 V system and, on diesels, the glow plugs that help the engine start from cold.

System: P · Powertrain
Area: Electrical system (12 V, starting and charging) · Car system: Ignition
Type: Generic (SAE J2012 / ISO 15031-6): the same meaning on every make
Indicative severity: Low. Check at the next service; usually does not affect safety or driveability.

What usually causes code P0381?

Faulty actuator, motor, coil or solenoid
Damaged, chafed or pinched wiring

The most likely causes come first. Only a check on the car confirms which one is yours.

What are the symptoms of code P0381?

Hard starting from cold
White smoke or a rough engine for the first few seconds
The glow plug light flashing or staying on

These are the usual symptoms of this kind of fault: not all of them always appear, and sometimes you notice nothing.

Can I keep driving with code P0381?

Usually yes, with care. This kind of fault does not usually affect safety or how the car drives, but have it checked at the next service. If you notice anything different (jerking, noises, smells, smoke or a red warning light), stop somewhere safe and get advice.

This is guidance only: only someone who checks the car can say whether it is safe to drive.

An indicative description of the code's generic meaning. Each manufacturer may give it a different meaning, conditions or tests: always follow its service information and your workshop's advice.

What you can do yourself

For this kind of fault

It shows most in cold weather. Until it is fixed, wait for the glow plug light to go out before starting, and do not keep cranking the engine for long.

Read the code and keep the report: with an ECO-LITE in the OBD socket you see it on your phone or computer, with the data captured when the fault happened.
Look for anything obvious: a loose connector, a disconnected hose, a fuel cap not closed properly or a low fluid level. Do not take apart anything you do not know.
Clear the code only after writing it down or after the repair. Clearing turns the light off, but it also deletes the freeze-frame data and the readiness monitors used at the inspection.
Drive normally for a few days and read the codes again. If the code comes back, the fault is still there: book the workshop and bring the report.

Read your car's fault codes on your phone

With an ECO-LITE in the OBD socket you see the codes in your account, with the data captured when the fault happened, and your workshop can check them remotely, always with your permission.

See the ECO-LITE Reserve (presale)

Related codes

P037EGlow plug, sense circuit: signal low
P037FGlow plug, sense circuit: signal high
P0380Glow plug/heater, circuit A: malfunction
P0382Glow plug/heater, circuit B: malfunction
P0383Glow plug control module 1, control circuit: signal low
P0384Glow plug control module 1, control circuit: signal high

P03xx codes: ignition system or misfire

All fault codes