The hydraulic pressure sensor is a vital transmission component that helps the computer decide how to shift gears. If an abnormally high voltage signal is detected along the hydraulic pressure sensor/line pressure sensor circuit, a DTC P0935 will be set.
How severe is the code?
If the vehicle’s computer cannot determine the hydraulic pressure output by the transmission pump, the transmission and, ultimately, the vehicle itself will not be able to operate properly. Ignoring a diagnostic code P0935 for too long can also lead to serious internal damage.
Symptoms
Symptoms of a P0935 include:
- Unusually harsh shifts at lower RPM
- Unusually soft shifts at higher RPM
- Reduced acceleration (if the transmission starts in 1st instead of 2nd)
- Unusually high RPM at speed (because the ECU told the transmission not to upshift)
Causes
- Damaged wiring and/or connectors
- Faulty fuses
- Faulty transmission pressure sensor
- ECU/TCM issues
How to diagnose the code?
To properly diagnose an OBDII fault code P0935, your mechanic must first inspect the condition of the wiring and connectors (including ground wires/contacts) along the transmission pressure sensor circuit. They should also check the associated fuses and relays. If nothing is found, the hydraulic pressure sensor/line pressure sensor itself must be tested, along with possibly the ECU and TCM.
What repairs will fix P0935?
- Replace or repair damaged wiring or connectors
- Replace blown fuses
- Replace the transmission pressure sensor
- Replace or reprogram the ECU or TCM
Related codes
P0932 – Hydraulic pressure sensor circuit
P0933 – Hydraulic pressure sensor range/performance
P0934 – Hydraulic pressure sensor circuit low
P0936 – Hydraulic pressure sensor circuit intermittent