P28D4: The clutch B motor phase U V W has a broken or disconnected wire
The clutch B motor phase U V W has a broken or disconnected wire. It is usually a broken wire, a loose connector or the part itself.
| Code | P28D4 |
|---|---|
| System | Engine and transmission |
| Group | P28xx, Transmission and engine |
| Type | Generic: it means the same on every make |
How to read and clear P28D4 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 P28D4 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
- P28CF High signal from the gearbox clutch 1 pressure sensor
- P28D0 The clutch A pressure sensor gives readings outside the normal range
- P28D2 The clutch B motor phase U V W gives a lower signal than normal
- P28D3 The clutch B motor phase U V W gives a higher signal than normal
- P28D5 The clutch B motor phase U V W gives readings outside the normal range
- P28D7 The clutch B pump motor gives readings outside the normal range
- P28D8 The clutch B motor is turning faster than it should
- P28D9 The clutch B motor is turning slower than it should
What does code P28D4 mean?
The clutch B motor phase U V W has a broken or disconnected wire. It is usually a broken wire, a loose connector or the part itself.
How do you clear P28D4?
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, P28D4 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.
