P0380 Glow plug/heater circuit A
What P0380 means
The engine control unit has detected an electrical fault in the glow plug heating circuit of a diesel engine. Glow plugs heat the combustion chambers so the engine starts easily in the cold, so this fault mainly affects cold starting and smoke.
P0380 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 80–350 €
- Workshop time
- 0.5–3 h
- Repair difficulty
- Medium
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- No
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Hard starting in cold weather
- White smoke after a cold start
- Rough running for the first minutes
- Glow plug light flashing or staying on
Common causes
- One or more burnt-out glow plugs
- Faulty glow plug relay or control module
- Broken or corroded wire or connector at a glow plug
- Blown glow plug fuse
Can I keep driving with P0380?
You can keep driving, but have it fixed within a week or two, especially before cold weather. Repeated hard starts load the battery and starter.
What to check first
- Check the glow plug fuse and the connectors on top of each glow plug
- Measure the resistance of each glow plug and replace those that are open-circuit
- Test the glow plug relay or control module for supply voltage and output
- Clear the code and confirm with a cold start the next morning
Related codes
- P0381 Glow plug/heater indicator control circuit/open
- P0366 Camshaft position sensor B circuit range/performance (bank 1)
- P0365 Camshaft position sensor B circuit (bank 1)
- P0363 Misfire detected, fuelling disabled
- P03AA Cylinder 3 pressure sensor circuit range/performance
- P0356 Ignition coil F primary control circuit / open
- P0355 Ignition coil E primary control circuit / open
- P0354 Ignition coil D primary control circuit/open
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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