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All codes/P0381

P0381

Glow Plug/Heater Indicator Circuit Malfunction

High severity

Electrical fault in the glow plug indicator lamp or relay circuit. The ECU monitors driver feedback to ensure the dashboard indicator can be commanded; an open or shorted circuit triggers this code.

Electrical fault in the glow plug indicator lamp or relay circuit. The ECU monitors driver feedback to ensure the dashboard indicator can be commanded; an open or shorted circuit triggers this code.

Common causes

  • Indicator bulb or LED failed

    A plausible cause — test and verify before replacing parts.

    medium

    Typical part cost: $20-220

  • Wiring or connector fault

    A plausible cause — test and verify before replacing parts.

    medium

    Typical part cost: $20-220

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First things to check

  1. 1Confirm the code with a scan tool and check for additional related codes.
  2. 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

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Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

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Related codes

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Frequently asked questions

What does P0381 mean?

P0381 means "Glow Plug/Heater Indicator Circuit Malfunction". It is a generic OBD-II code that points to a fault in the ignition system or misfire.

What are the most common causes of P0381?

indicator bulb or led failed; wiring or connector fault — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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