P256F: The air conditioning request B gives readings outside the normal range
The air conditioning request B gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
| Code | P256F |
|---|---|
| System | Engine and transmission |
| Group | P25xx, Auxiliary inputs and electrical system |
| Type | Generic: it means the same on every make |
How to read and clear P256F 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 P256F 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
- P256B The idle speed selector sensor gives readings outside the normal range
- P256C The idle speed selector sensor gives a lower signal than normal
- P256D The idle speed selector sensor gives a higher signal than normal
- P256E The idle speed selector sensor fails now and then
- P2570 The direct ozone reduction catalytic converter temperature sensor gives a
- P2571 The direct ozone reduction catalytic converter temperature sensor fails now and
- P2572 There is a fault in the sensor that monitors deterioration of the direct ozone
- P2573 The direct ozone reduction catalyst deterioration sensor is out of range or not
- P2563 Turbocharger boost control position sensor A range/performance
What does code P256F mean?
The air conditioning request B gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
How do you clear P256F?
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, P256F 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.
