P0841 on Toyota Corolla E170: Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance

Short answer: P0841 means “Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance”. The car’s computer has found a fault in the AT (gearbox) system and turns on the Check engine light (MIL). First check: read the code with a scanner that can read the gearbox computer.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code

P0841

System

AT (gearbox)

Dashboard light

Check engine light (MIL)

Applies to

Generic OBD-II meaning. Not every code is used by this car.

Confidence

medium (generic OBD-II definition, not checked against the factory manual for this car)

Source

obd-codes.com

Symptoms and when it is set

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

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P0841 · Toyota Corolla (10th gen, E140)
• P0841 · Honda City (5th gen, GM2)
• P0841 · Honda Civic (10th gen, FC)
• P0841 · Suzuki Wagon R (Pakistan, K10B)
• P0841 on all cars compared

← P0770 P0850 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.