P0477: The exhaust pressure control valve gives a lower signal than normal
The exhaust pressure control valve gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | P0477 |
|---|---|
| System | Engine and transmission |
| Group | P04xx, Emissions control |
| Type | Generic: it means the same on every make |
How to read and clear P0477 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 P0477 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
- P0473 The exhaust pressure sensor gives a higher signal than normal
- P0474 The exhaust pressure sensor fails now and then
- P0475 The exhaust pressure control valve is not working properly
- P0476 The exhaust pressure control valve gives readings outside the normal range
- P0478 The exhaust pressure control valve gives a higher signal than normal
- P0479 The exhaust pressure control valve fails now and then
- P047A The exhaust pressure sensor B has an electrical fault
- P047B The exhaust pressure sensor B gives readings outside the normal range
- P0400 Exhaust gas recirculation (EGR) flow malfunction
- P0401 Exhaust gas recirculation (EGR) flow insufficient
- P0402 Exhaust gas recirculation (EGR) flow excessive
- P0403 EGR control circuit malfunction
What does code P0477 mean?
The exhaust pressure control valve gives a lower signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear P0477?
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, P0477 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.
