OBD-II · Engine and powertrain (P)
P0381
Glow plug indicator (warning light) control circuit
What it means
The circuit that operates the glow plug warning light on the dashboard has a fault. The glow plugs themselves may still work.
Symptoms
- glow plug light does not come on, or stays on
- engine warning light
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | wiring fault to the instrument cluster |
| 02 | instrument cluster fault |
| 03 | failed bulb on older cars |
| 04 | engine computer output fault |
What to check, step by step
- 01Check whether the glow plug light comes on at key-on.
- 02Check for communication codes between engine computer and instrument cluster.
- 03Inspect wiring to the cluster (older cars) or cluster operation via a diagnostic tool.