A transmission fluid pressure sensor is used by the ECU to determine if there is enough hydraulic pressure inside the transmission to execute a shift. If a vehicle has a P0875 DTC, it means that there is either a problem with the voltage signal coming from the TFPS sensor, or an internal mechanical component has caused a problem with the hydraulic pressure.
How Serious is the Code?
The P0875 diagnostic trouble code is very serious, because it could be caused by either an electrical problem or a mechanical problem. But no matter the cause, you can expect a number of rather serious drivability issues.
Symptoms of a P0875 include:
- Overheating transmission
- Transmission slips
- Failed gear engagement
- The transmission fluid is too low
- The transmission fluid is dirty
- Bad gasket or components causing a transmission fluid leak
- The transmission is overheated
- The engine is overheating
- Shorted/frayed wiring
- Corroded or broken connectors
- The transmission pump is faulty
- The transmission fluid pressure sensor is faulty
- The transmission fluid temperature sensor is faulty
- The TCM is faulty
- Internal mechanical failure
How to Diagnose the Code?
Manufacturer’s TSB databases can be a very useful resource when trying to diagnose a P0875 OBDII trouble code. If no known solutions are found, then the wiring and connectors along the transmission wiring harness will need to be checked for signs of damage. The transmission fluid pressure sensor itself will also need to be tested. If nothing is found up to this point, then an internal mechanical failure should be suspected.
What Repairs Will Fix P0875?
- Change the transmission fluid and filter
- Repair transmission fluid leaks
- Repair or replace damaged wiring and sensors on the transmission wiring harness
- Replace the transmission pump
- Replace transmission fluid pressure sensor
- Replace transmission fluid temperature sensor
- Replace or repair valve body
- Replace or repair transmission