P3478: The cylinder 10 exhaust valve control gives readings outside the normal range
The cylinder 10 exhaust valve control gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
| Code | P3478 |
|---|---|
| System | Engine and transmission |
| Group | P34xx, Cylinder deactivation |
| Type | Generic: it means the same on every make |
How to read and clear P3478 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 P3478 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
- P3474 The cylinder 10 intake valve deactivation control circuit is not working
- P3475 The cylinder 10 intake valve deactivation control signal is electrically low
- P3476 The cylinder 10 intake valve deactivation control signal is electrically high
- P3477 The cylinder 10 exhaust valve control has a broken or disconnected wire
- P3479 The cylinder 10 exhaust valve control gives a lower signal than normal
- P3480 The cylinder 10 exhaust valve control gives a higher signal than normal
- P3481 The cylinder 11 intake valve deactivation control circuit is open
- P3482 The cylinder 11 intake valve deactivation control circuit is not working
What does code P3478 mean?
The cylinder 10 exhaust valve control gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
How do you clear P3478?
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, P3478 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.
