OBD-II Code · Powertrain
P0381
Glow Plug/Heater Indicator Circuit
medium severitySafe to drive$200-$800
Glow plug indicator circuit fault on diesel engines.
Common symptoms
- CEL
- Glow plug indicator lamp issue
- Hard cold starts
Likely causes
- Failed glow plug control module
- Wiring
- Failed glow plug(s)
Where to start
- Try the cheapest cause first. Start by checking: failed glow plug control module.
- Cost & scope. $200-$800
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
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