The P0847 DTC means that there is a low voltage situation on the circuit that the transmission fluid pressure sensor operates on. The sensor is important to the operation of the transmission, because it relays the amount of hydraulic pressure available to the ECU.
How Serious is the Code?
A P0847 diagnostic trouble code is actually quite serious, because if there is a problem with either the transmission fluid pressure sensor, or the amount of hydraulic pressure available, a number of drivability issues can occur. These include harsh shifts, delayed shifts and transmission overheating.
Symptoms of a P0847 include:
- Hard or erratic gear changes
- Transmission refuses to shift
- Lower MPG
- Torque converter clutch refuses to work
- Transmission overheating
- Low transmission fluid level
- Dirty transmission fluid / filter
- Transmission fluid leak
- Damaged wiring/connector
- Faulty pressure control solenoid
- Faulty pressure regulator
- Faulty transmission fluid pressure sensor
- Faulty transmission pump
- Internal pressure issue
- Valve body issue
- ECU or TCM failure
How to Diagnose the Code?
Having dirty transmission fluid or a low level of transmission can actually cause a P0847 OBDII trouble code. If the ATF is clean and bright, then the wiring and connectors on the wiring harness will need to be checked, along with the operation of the transmission fluid pressure sensor itself. If no issues are found, then further mechanical diagnosis will be needed.
What Repairs Will Fix P0847?
- 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