P0380: Glow Plug/Heater Circuit A Malfunction
The glow plug system that helps a diesel start in cold weather has an electrical problem.
Green, yellow, red: three ways P0380 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Mild weather, starts fine.
Schedule a repair
Hard cold starts. Repair before winter.
Stop and get help
No-start in the cold. Get it checked before you need it.
Symptoms you might notice
- Hard cold starts
- White smoke at startup
Common causes, cheapest first
- Burned-out glow plug
- Failed glow plug module or relay
- Wiring problem
What you can check before calling
- Note cold-start behavior
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More diesel & cummins codes
- P2002
Diesel Particulate Filter Efficiency Below Threshold (Bank 1) - P2463
Diesel Particulate Filter Restriction - Soot Accumulation - P242F
Diesel Particulate Filter Restriction - Ash Accumulation - P2459
Diesel Particulate Filter Regeneration Frequency - P2453
Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance - P2454
Diesel Particulate Filter Pressure Sensor A Circuit Low
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0380 mean?
P0380 means "Glow Plug/Heater Circuit A Malfunction". The glow plug system that helps a diesel start in cold weather has an electrical problem.
Can I drive with code P0380?
It depends on what the vehicle is doing. Green: Mild weather, starts fine. Yellow: Hard cold starts. Repair before winter. Red: No-start in the cold. Get it checked before you need it.
What causes P0380?
The most common causes are: burned-out glow plug; failed glow plug module or relay; wiring problem.
Is P0380 a serious code?
It can be. No-start in the cold. Get it checked before you need it.
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