P04DC: The fuel tank flap position sensor gives readings outside the normal range
The fuel tank flap position sensor gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P04DC |
|---|---|
| System | Engine and transmission |
| Group | P04xx, Emissions control |
| Type | Generic: it means the same on every make |
How to read and clear P04DC 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 P04DC 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
- P04D8 The EGR control takes too long to enter closed loop operation
- P04D9 The EGR closed loop control in the limit flow gives a lower signal than normal
- P04DA The EGR closed loop control in the limit flow gives a higher signal than normal
- P04DB The crankcase breather system is disconnected
- P04E0 The evaporative emission system purge control valve A has got stuck
- P04E1 The sump ventilation hose connection sensor has an electrical fault
- P04E2 The sump ventilation hose connection sensor gives a lower signal than normal
- P04E3 The sump ventilation hose connection sensor gives a higher signal than normal
- 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 P04DC mean?
The fuel tank flap position 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 P04DC?
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, P04DC 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.
