P0841 Transmission fluid pressure sensor/switch A range/performance
What P0841 means
The transmission control unit sees a fluid pressure sensor or switch reading that does not match the gear and pressure it commanded. It may be a sensor fault, or the hydraulic pressure itself may be wrong.
P0841 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 400–2500 €
- Workshop time
- 2–8 h
- Repair difficulty
- Hard
- DIY possible
- No
- Check engine light
- Yes
- Affects emissions test
- No
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Harsh or delayed shifts
- Limp mode
- Transmission warning on
Common causes
- Low transmission fluid level
- Faulty fluid pressure sensor or switch
- Sticking valve in the valve body
- Damaged internal wiring or connector
Can I keep driving with P0841?
You can drive carefully, but have it checked within one to two weeks.
What to check first
- Check transmission fluid level and condition
- Inspect the gearbox connector and harness
- Check the pressure sensor signal in live data against the commanded pressure
- Replace the sensor or have the valve body inspected
Related codes
- P0868 Transmission fluid pressure low
- P0882 TCM power input signal low
- P0894 Transmission component slipping
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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