An automatic transmission uses pressurized transmission fluid to move gears around and propel you down the road. If the transmission fluid pressure sensor has an unusually high voltage on the circuit it operates on, a P0848 DTC will be set.
How Serious is the Code?
A P0848 diagnostic trouble code is quite serious, because it means either there is a problem with the amount of hydraulic pressure, or there is a problem with the sensors that monitors it. In either case, drivability issues can occur.
Symptoms of a P0848 include:
- Unusually hard or erratic shifting
- Transmission will not change gears
- Increased fuel consumption
- Torque converter clutch will not work
- Transmission overheating
- Low transmission fluid
- Dirty transmission fluid / filter
- Transmission fluid leak
- Frayed wiring / damaged connectors
- Failed pressure control solenoid
- Failing pressure regulator
- Failed transmission fluid pressure sensor
- Failed transmission pump
- Pressure blockage
- Valve body issue
- TCM or ECU failure
How to Diagnose the Code?
The first thing a mechanic should do when trying to diagnose a P0848 OBDII trouble code, is to check the level and condition of the transmission fluid. The wiring and connectors on the transmission wiring harness will also tested, along with the transmission fluid pressure sensor itself. If no problems are found, further mechanical diagnosis will be needed.
What Repairs Will Fix P0848?
- Change transmission fluid and filter
- Repair leaks
- Repair or replace damaged wiring and connectors
- Replace transmission fluid pressure sensor
- Repair or replace torque converter
- Repair or replace valve body
- Replace transmission pump
- Replace pressure control solenoid
- Replace pressure regulator
- Reprogram or replace TCM