P0791: The intermediate shaft speed sensor has an electrical fault
The intermediate shaft speed sensor has an electrical fault. It may be the part itself, its connector or the wiring.
| Code | P0791 |
|---|---|
| System | Engine and transmission |
| Group | P07xx, Transmission |
| Type | Generic: it means the same on every make |
How to read and clear P0791 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 P0791 with its description and whether it’s confirmed, pending or permanent.
This code is usually stored by the gearbox control unit. If the car reports it over standard OBD, you read it for nothing with FREE; to read it straight from the gearbox control unit, with its description and clearing, you need PRO.
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
- P078D The gearbox timing solenoid B gives a higher signal than normal
- P078E The gearbox timing solenoid B fails now and then
- P078F The circuit of gearbox mode selection switch C has a fault
- P0790 There is a fault in the normal mode switch circuit
- P0792 The intermediate shaft speed sensor gives readings outside the normal range
- P0793 The intermediate shaft speed sensor sends no signal
- P0794 The intermediate shaft speed sensor fails now and then
- P0795 The pressure control solenoid C is not working properly
- P0700 Transmission control system: fault detected
- P0701 Transmission control system: range/performance
- P0702 Transmission control system: electrical fault
- P0703 Torque converter/brake switch B: circuit fault
What does code P0791 mean?
The intermediate shaft speed sensor has an electrical fault. It may be the part itself, its connector or the wiring.
How do you clear P0791?
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, P0791 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.
