OBD-II · Engine and powertrain (P)
P0384
Glow plug control module control circuit high
What it means
The command signal from the engine computer to the glow plug control module reads high.
Symptoms
- harder starting when cold
- rough running and white smoke for the first moments after a cold start
- glow plug light may flash
- possibly no symptoms in warm weather
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | command wire shorted to voltage or open |
| 02 | failed glow plug control module |
| 03 | corroded connector |
What to check, step by step
- 01Inspect the connector at the glow plug control module for corrosion.
- 02Check the command wire for a short or open between engine computer and module.
- 03Check the module's power supply and ground.
- 04Replace the module if wiring and commands are good.