Error code

OBD2 P0380

OBD2P0380
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Glow Plug/Heater Circuit 'A'.

Severity

highCan drive, but starting issues may occur at cold temperatures.

Summary

P0380 indicates a malfunction in the glow plug heater circuit 'A' on diesel engines. This code is related to issues with the wiring, relay, fuse, or glow plugs themselves.

Symptoms

  • Engine difficulty starting at cold temperatures
  • Check engine light illuminated

Common Causes

  • Defective glow plugs
  • Damaged or corroded wiring and connectors in circuit A
  • Blown fuses or fusible links
  • Faulty glow plug relay
  • Malfunctioning ignition switch
  • Failed engine coolant temperature sensor
  • Defective timer (if present)
  • Issues with the glow plug control module (if equipped)
  • PCM failure

Diagnosis

  1. Check for blown fuses or fusible links in the glow plug circuit.
  2. Inspect wiring and connectors for damage or corrosion.
  3. Test the glow plugs individually to identify faulty units.
  4. Verify operation of the ignition switch and relay.
  5. Examine the engine coolant temperature sensor.
  6. If equipped, test the glow plug control module and timer.

Fixes

  • Replace defective components such as fuses, relays, or faulty glow plugs.

FAQ

What does P0380 mean?

P0380 indicates a malfunction in the glow plug heater circuit 'A' on diesel engines.

How do I fix P0380?

Fixing P0380 involves identifying and replacing faulty components such as fuses, relays, or defective glow plugs.

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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