P0841: Transmission fluid pressure sensor/switch A: circuit range or performance
The control unit sees gearbox fluid pressure sensor A reporting values that do not add up. Fluid level, the sensor or its connector are usual culprits.
| Code | P0841 |
|---|---|
| System | Engine and transmission |
| Group | P08xx, Transmission |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0841 means
The automatic gearbox monitors its fluid pressure with a sensor or pressure switch. Here the signal is present but does not match what the control unit expects for the gear and operating conditions. What sensor A is and where it sits is decided by each manufacturer.
Most common causes
- Low transmission fluid level or badly degraded fluid
- Loose, dirty or corroded sensor connector
- Chafed or damaged sensor wiring
- Faulty pressure sensor or switch itself
- Genuinely wrong pressure from a blocked filter or valve body fault
Symptoms
- Engine or gearbox warning light on
- Harsh or odd shifts
- Gearbox limp mode
- Sometimes no noticeable symptoms
Can you drive with P0841?
With care You can drive with care, but if the actual pressure is also wrong the gearbox can suffer. Best to have it checked soon.
Open the bonnetthe in-depth explanation
How to check it
Start by checking the gearbox fluid level, the cheapest step. If your scanner shows fluid pressure or the switch state, see whether it changes when you select D or R with your foot on the brake.
How to read and clear P0841 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 P0841 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
- P083D The gearbox oil pressure sensor G gives a higher signal than normal
- P083E The gearbox oil pressure sensor G fails now and then
- P083F Clutch pedal position switches A and B give conflicting signals
- P0840 The gearbox oil pressure sensor A has an electrical fault
- P0842 Transmission fluid pressure sensor/switch A: circuit low
- P0843 Transmission fluid pressure sensor/switch A: circuit high
- P0844 The gearbox oil pressure sensor A fails now and then
- P0845 The gearbox oil pressure sensor B has an electrical fault
- P0868 Transmission fluid pressure low
What does code P0841 mean?
The automatic gearbox monitors its fluid pressure with a sensor or pressure switch. Here the signal is present but does not match what the control unit expects for the gear and operating conditions. What sensor A is and where it sits is decided by each manufacturer.
Can you drive with P0841?
You can drive with care, but if the actual pressure is also wrong the gearbox can suffer. Best to have it checked soon.
How do you clear P0841?
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, P0841 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.
