The transmission fluid pressure sensor F range the amount of hydraulic pressure available, then relays that information back to the ECU so it can decide on the most appropriate shift strategy. If there is a low voltage signal coming from the TFPS sensor, this scenario will happen and the computer will save a P0994 DTC.
How Serious is the Code?
The P0994 diagnostic trouble code is very serious, and can result in a number of transmission problems that include limp mode, failed gear engagement and unusually harsh shifts.
Symptoms of a P0994 include:
- Hard shifts
- Transmission cannot engage a gear
- Limp Mode
- Low or dirty transmission fluid
- Damaged wiring and/or connectors
- Faulty transmission line pressure sensor/transmission fluid pressure sensor
- Valve body issues
How to Diagnose the Code?
The process of diagnosing a P0994 OBDII trouble code should start with an examination of the level and condition of the transmission fluid. If it looks clean and bright, then the wiring and connectors along the transmission wiring harness should be checked for signs of damage wires and broken or corroded connectors. The transmission line pressure sensor will also need to be tested. If it works, then further mechanical diagnosis will be needed.
What Repairs Will Fix P0994?
- Add or change transmission fluid and filter
- Repair or replace damaged wiring and connectors
- Replace transmission fluid pressure sensor/switch
- Repair or install remanufactured valve body
- P0992 – Transmission Fluid Pressure Sensor/Switch “F” Circuit
- P0993 – Transmission Fluid Pressure Sensor/Switch “F” Circuit Range/Performance
- P0995 – Transmission Fluid Pressure Sensor/Switch “F” Circuit High
- P0996 – Transmission Fluid Pressure Sensor/Switch “F” Circuit Intermittent