P23DF: The cylinder 4 fuel heater control gives a lower signal than normal
The cylinder 4 fuel heater control gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | P23DF |
|---|---|
| System | Engine and transmission |
| Group | P23xx, Ignition coils and engine |
| Type | Generic: it means the same on every make |
How to read and clear P23DF 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 P23DF 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
- P23DB The cylinder 3 fuel heater control gives a lower signal than normal
- P23DC The cylinder 3 fuel heater gives readings outside the normal range
- P23DD The cylinder 4 fuel heater control has a broken or disconnected wire
- P23DE The cylinder 4 fuel heater control gives a higher signal than normal
- P23E0 The cylinder 4 fuel heater gives readings outside the normal range
- P23E1 The EGR control has a broken or disconnected wire
- P23E2 The EGR control gives readings outside the normal range
- P23E3 The EGR control gives a lower signal than normal
- P2300 Ignition coil A primary control circuit low
- P2301 Ignition coil A primary control circuit high
- P2303 Ignition coil B primary control circuit low
- P2304 Ignition coil B primary control circuit high
What does code P23DF mean?
The cylinder 4 fuel heater control gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear P23DF?
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, P23DF 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.
