A hydraulic pressure sensor/transmission line pressure sensor, reads how much hydraulic pressure is currently inside of the transmission, then relays this information via a voltage signal to the ECU. This data is used to determine how much to adjust this pressure to suit the current driving conditions, using the pressure control solenoid(s). If there is only an intermittent signal coming from the hydraulic pressure sensor circuit, a P0936 DTC will be triggered.
How Serious is the Code?
The P0936 diagnostic trouble code is actually very serious, because without an accurate hydraulic pressure reading, a number of drivability problems can occur. These include unusually harsh shifts, significantly reduced acceleration and top speed due to gear lockout.
Symptoms of a P0936 include:
- Harsh shifting at lower RPM
- Soft shifting at higher RPM under load
- Reduced acceleration (if the transmission starts off in a higher gear)
- Increased engine RPM at speed (if the ECU locks out higher gears)
- Damaged connectors or wiring
- Blown fuses
- Failed transmission pressure sensor
- ECU/TCM issues
How to Diagnose the Code?
To figure out what is causing a P0936 OBDII trouble code, all of the wiring, grounds and connectors along the transmission pressure sensor circuit will have to be examined for signs of damage and corrosion. Any related fuses and relays should also be checked. If no problems are found, then the hydraulic pressure sensor itself will have to be tested. Occasionally, the ECU and/or TCM may be at fault.
What Repairs Will Fix P0936?
- Replace or repair damaged wiring or connectors
- Replace blown fuses
- Replace transmission pressure sensor
- Replace or reprogram ECU or TCM
- P0932 – Hydraulic Pressure Sensor Circuit
- P0933 – Hydraulic Pressure Sensor Range/Performance
- P0934 – Hydraulic Pressure Sensor Circuit Low
- P0935 – Hydraulic Pressure Sensor Circuit High