P0C21: The gearbox oil auxiliary pump phase U V W gives a lower signal than normal
The gearbox oil auxiliary pump phase U V W gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | P0C21 |
|---|---|
| System | Engine and transmission |
| Group | P0Cxx, Hybrid and electric |
| Type | Generic: it means the same on every make |
How to read and clear P0C21 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 P0C21 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
- P0C1D The gearbox oil auxiliary pump control unit internal temperature sensor gives
- P0C1E The gearbox oil auxiliary pump control unit internal temperature sensor gives a
- P0C1F The gearbox oil auxiliary pump control unit internal temperature sensor gives a
- P0C20 The gearbox oil auxiliary pump phase U V W has a broken or disconnected wire
- P0C22 The gearbox oil auxiliary pump phase U V W gives a higher signal than normal
- P0C23 The gearbox oil auxiliary pump control unit has a broken or disconnected wire
- P0C24 The gearbox oil auxiliary pump control unit gives a lower signal than normal
- P0C25 The gearbox oil auxiliary pump control unit gives a higher signal than normal
What does code P0C21 mean?
The gearbox oil auxiliary pump phase U V W gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear P0C21?
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, P0C21 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.
