A transmission fluid pressure sensor/transmission line pressure sensor, means the amount of hydraulic pressure inside the transmission, then signals the ECU through a series of electrical pulses. If the ECU detects a problem somewhere between it and the TFPS sensor, a P0992 DTC will be saved.
How Serious is the Code?
The P0992 diagnostic trouble code is extremely serious, because without an accurate hydraulic pressure reading, the ECU will not be able to execute shifts shift properly.
Symptoms of a P0992 include:
- Transmission seems to bang into gear
- Transmission won’t engage a gear
- Limp Mode
- Dirty transmission fluid/filter
- Transmission fluid is too low
- Wiring damage
- Corroded and/or broken connectors
- Bad transmission fluid pressure sensor/transmission line pressure sensor
- Valve body issues
How to Diagnose the Code?
When a technician is trying to figure out what is causing a P0992 OBDII trouble code, they should always start by checking the level and condition of the transmission fluid. Dirty or low fluid can actually affect the hydraulic pressure inside the transmission, so dirty fluid should always be changed immediately before continuing the diagnostic process. After that, the wiring and connectors along the transmission wiring harness will have to be examined for signs of damage and corrosion. If no issues have been found up to this point, then the transmission fluid pressure switch will have the be tested. If it works, then there may be mechanical problems deep inside the transmission that are causing this OBD2 code.
What Repairs Will Fix P0992?
- 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
- P0993 – Transmission Fluid Pressure Sensor/Switch “F” Circuit Range/Performance
- P0994 – Transmission Fluid Pressure Sensor/Switch “F” Circuit Low
- P0995 – Transmission Fluid Pressure Sensor/Switch “F” Circuit High
- P0996 – Transmission Fluid Pressure Sensor/Switch “F” Circuit Intermittent