P06F9: There is a fault in the glow plug control unit 2 system voltage
There is a fault in the glow plug control unit 2 system voltage. It may be the control unit itself, its power supply or its connector.
| Code | P06F9 |
|---|---|
| System | Engine and transmission |
| Group | P06xx, Control unit and auxiliary outputs |
| Type | Generic: it means the same on every make |
How to read and clear P06F9 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P06F9 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P06F5 The glow plug 2 control unit is not working properly
- P06F6 The glow plug control unit 2 control has a broken or disconnected wire
- P06F7 The glow plug control unit 2 control gives a lower signal than normal
- P06F8 The glow plug control unit 2 control gives a higher signal than normal
- P06FA The glow plug 2 control unit gives readings outside the normal range
- P06FC The glow plug 2 control unit at the engine control unit communication has an
- P06FD The glow plug 2 control unit at the engine control unit communication gives
- P06FE The cold start diesel intake air flow control gives readings outside the normal
- P0600 Serial communication link fault
- P0601 Internal control module memory checksum error
- P0602 Control module programming error
- P0603 Internal control module keep alive memory (KAM) error
What does code P06F9 mean?
There is a fault in the glow plug control unit 2 system voltage. It may be the control unit itself, its power supply or its connector.
How do you clear P06F9?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P06F9 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
