P0841: Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance

Short answer: P0841 means “Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance”. It is a standard OBD-II code, so the basic meaning is the same on every car. Below is what it means on each of the 5 cars we cover, with a link to the full page for each car.

Standard OBD-II code Same meaning on all cars (SAE J2012).

P0841 on each car

Symptoms

1. Check engine light on

Likely causes

1. Typically the causes for this code to set are
2. Open in the signal circuit to the TFPS sensor - possible
3. Short to voltage in the signal circuit to the TFPS sensor - possible
4. Short to ground in the signal circuit to the TFPS sensor - possible
5. Failed TFPS Sensor – likely
6. Internal mechanical transmission issue - possible
7. Failed PCM - unlikely (programming required after replacement)

What to check, in order

1. Read the code with a scanner that can read the gearbox computer
2. Check the gearbox fluid level and condition with the correct procedure
3. Check the connector and wiring at the gearbox
4. Have a gearbox specialist confirm before replacing parts

Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.

All fault codes