Error code

OBD2 P0381

OBD2P0381
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Glow Plug/Heater Indicator Circuit.

Severity

highCan be driven, but may experience starting issues and potential damage to the starter motor and battery.

Summary

P0381 indicates an issue with the glow plug warning lamp circuit on diesel engines. This code is set when the PCM detects a malfunction preventing the glow plug warning light from functioning properly.

Symptoms

  • Glow plug warning light does not illuminate or remains illuminated
  • Extended cranking times, no start conditions

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Defective engine coolant temperature sensor(s)
  • Poor ground connections between the battery and the vehicle components
  • Blown glow plug warning light bulb
  • Defective glow plug relay or blown fuse/fusible link
  • Defective ignition switch
  • Defective glow plug control module

Diagnosis

  1. Check for damaged or corroded wiring and connectors in the glow plug circuit.
  2. Inspect engine coolant temperature sensor(s) for proper operation.
  3. Verify ground connections between the battery, engine, and vehicle body.
  4. Replace blown fuse/fusible link if necessary.
  5. Test ignition switch functionality.

Fixes

  • Repair or replace damaged wiring and connectors in the glow plug circuit.
  • Replace defective engine coolant temperature sensor(s).
  • Improve ground connections between battery, engine, and vehicle body.

FAQ

What causes the glow plug warning light to remain on?

A malfunction in the glow plug circuit can cause the warning light to stay illuminated. This could be due to a blown fuse, defective relay, or wiring issues.

Can I drive with P0381 code?

You may be able to drive but starting issues and potential damage to the starter motor and battery are possible if not addressed.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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