P066C: The cylinder 2 glow plug control gives a lower signal than normal
The cylinder 2 glow plug control gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | P066C |
|---|---|
| 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 P066C 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 P066C 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
- P0668 The internal temperature sensor of the engine or gearbox control unit gives a
- P0669 High signal from the internal temperature sensor of the control unit
- P066A The cylinder 1 glow plug control gives a lower signal than normal
- P066B The cylinder 1 glow plug control gives a higher signal than normal
- P066D The cylinder 2 glow plug control gives a higher signal than normal
- P066E The cylinder 3 glow plug control gives a lower signal than normal
- P066F The cylinder 3 glow plug control gives a higher signal than normal
- P0670 Glow plug module control: circuit fault
- 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 P066C mean?
The cylinder 2 glow plug control gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear P066C?
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, P066C 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.
