OBD-II · Engine and powertrain (P)
P0841
Transmission fluid pressure sensor/switch A range/performance
What it means
The transmission fluid pressure reading does not match what the control unit expects for the current operating state.
Symptoms
- gearbox warning light or engine warning light
- harsh, delayed or no gear changes
- limp mode, stuck in one gear
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | low transmission fluid level |
| 02 | faulty pressure sensor or switch (often in the mechatronic unit) |
| 03 | valve body or solenoid fault |
| 04 | wiring or connector fault |
What to check, step by step
- 01Check the transmission fluid level and condition
- 02Read all transmission codes and pressure values in live data
- 03Inspect the connector for fluid and corrosion
- 04Refer to a transmission specialist for pressure testing