P06F8Glow Plug Control Module 2 Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P06F8 means the command line from the engine module to glow plug control module 2 is too high, typically shorted to positive – the counterpart of P0384 for module 1. Note that Ford's 2023 diesels use P0384 differently, for the supply voltage of the glow module (below 6.5 V or above 16.5 V); in J2012 that is P052F, and for module 2 P06F9. No manufacturer document available to us uses a second glow module – Ford's and GM's V8 diesels drive all eight plugs from one; the code suits systems with one module per cylinder bank. The description follows module 1 (P0384). An open line is P06F6, a short to ground P06F7. The plugs of module 2 then heat poorly or not at all, typically on one bank.
- What you may notice
- Check engine light, possibly glow plug/wait-to-start lamp
- Hard cold start, long cranking in frost
- Rough cold idle and white smoke, often one cylinder bank only
- Usually no symptoms when warm
- Likely causes
- LikelyCommand line shorted to positive or supply
- PossibleCorrosion in the connector bridging to a B+ pin
- RareEngine module driver shorted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.