P06F6 code meaning
Glow Plug Control Module 2 Control Circuit/Open
Powertrain system Generic code P06xx codes Check engine light
What P06F6 means
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.
P06F6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P06F6
- 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
Common causes of P06F6
- Most likelyLine from engine module to glow module 2 open, connector loose or corroded
- PossibleInput of glow module 2 faulty or module not connected
- Less likelyEngine module output driver faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Glow plug control module 2Module wiringEngine control module
What each part of P06F6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| F6 | The exact fault in that area. |
What to do next
- Note P06F6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P06F6
What does P06F6 mean?
P06F6 means "Glow Plug Control Module 2 Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P06F6?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P06F6 fail an emissions test?
Yes, it can. P06F6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P06F6 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P06F6 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.