P28DF: The clutch B pressure sensor gives readings outside the normal range
The clutch B pressure sensor gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P28DF |
|---|---|
| System | Engine and transmission |
| Group | P28xx, Transmission and engine |
| Type | Generic: it means the same on every make |
How to read and clear P28DF 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 P28DF with its description and whether it’s confirmed, pending or permanent.
This code is usually stored by the gearbox control unit. If the car reports it over standard OBD, you read it for nothing with FREE; to read it straight from the gearbox control unit, with its description and clearing, you need PRO.
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
- P28DB The clutch B motor position sensor gives readings outside the normal range
- P28DC The clutch B pressure sensor has a broken or disconnected wire
- P28DD The clutch B pressure sensor gives a lower signal than normal
- P28DE The clutch B pressure sensor gives a higher signal than normal
- P28E0 The gearbox motor phase U V W gives a lower signal than normal
- P28E1 The gearbox motor phase U V W gives a higher signal than normal
- P28E2 The gearbox motor phase U V W has a broken or disconnected wire
- P28E3 The gearbox motor phase U V W gives readings outside the normal range
What does code P28DF mean?
The clutch B pressure sensor gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
How do you clear P28DF?
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, P28DF 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.
