OBD-II code · Powertrain (generic)
P0381 Glow Plug/Heater Indicator Circuit Malfunction
Electrical fault in the glow plug indicator lamp or relay circuit. The ECU monitors driver feedback to ensure the dashboard indicator can be commanded; an open or shorted circuit triggers this code.
Is it safe to drive with P0381?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleIndicator bulb or LED failed
- PossibleWiring or connector fault
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.2–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Glow Plug Indicator, Indicator Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.