P06F6Glow Plug Control Module 2 Control Circuit/Open
- 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
- P06F6 means the command line from the engine module to glow plug control module 2 is open or has a general circuit fault – the counterpart of P0670 for module 1. The engine module's output driver detects an open load while the driver is off. 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 (P0670). Shorts on the same line are P06F7 (to ground) and P06F8 (to positive); the feedback line back to the engine module is P06FC/P06FD. 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
- LikelyLine from engine module to glow module 2 open, connector loose or corroded
- PossibleInput of glow module 2 faulty or module not connected
- RareEngine module output driver faulty
- 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.