What are the common causes of P0380?

A failed glow plug in circuit A. An open or short in the circuit A glow plug harness. A bad glow plug control module. Corroded circuit A connectors. Low battery voltage during the glow cycle.

Check each glow plug in circuit A for continuity. Test the circuit A harness for an open or short. Measure the circuit A glow plug resistance while cold. Inspect the circuit A connectors for corrosion. Replace the glow plug control module if the plugs and wiring test good. Clear the code and retest.

P0380

Glow Plug/Heater Circuit A

System: Ignition and misfire (P code)
Lamp: Check Engine Light
Category: Powertrain - Ignition

What it means

P0380 means Glow Plug/Heater Circuit A.

Check these first

A failed glow plug in circuit A
An open or short in the circuit A glow plug harness
A bad glow plug control module
Corroded circuit A connectors
Low battery voltage during the glow cycle

What to do next

Check each glow plug in circuit A for continuity
Test the circuit A harness for an open or short
Measure the circuit A glow plug resistance while cold
Inspect the circuit A connectors for corrosion
Replace the glow plug control module if the plugs and wiring test good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.