P2A77: The alternative fuel hydraulic pump pressure sensor gives a lower signal than
The alternative fuel hydraulic pump pressure sensor gives a lower signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P2A77 |
|---|---|
| System | Engine and transmission |
| Group | P2Axx, Engine and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2A77 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 P2A77 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
- P2A73 The alternative fuel hydraulic fuel pump selection valve control gives a higher
- P2A74 The alternative fuel hydraulic fuel pump selection valve control fails now and
- P2A75 The alternative fuel hydraulic pump pressure sensor has an electrical fault
- P2A76 The alternative fuel hydraulic pump pressure sensor gives readings outside the
- P2A78 The alternative fuel hydraulic pump pressure sensor gives a higher signal than
- P2A79 The alternative fuel hydraulic pump pressure sensor fails now and then
- P2A7A The alternative fuel hydraulic pressure sensor has an electrical fault
- P2A7B The alternative fuel hydraulic pressure sensor gives readings outside the
- P2A00 O2 sensor circuit range/performance (bank 1, sensor 1)
What does code P2A77 mean?
The alternative fuel hydraulic pump pressure sensor gives a lower signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
How do you clear P2A77?
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, P2A77 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.
