Transmission Fluid Pressure Sensor/Switch "E" Circuit High
The transmission fluid pressure sensor/switch E circuit is detecting a voltage level that is higher than the PCM/TCM expects, indicating an electrical fault in the sensor circuit. This typically means there is a short to power, open ground circuit, or a failed sensor that is preventing the transmission control module from accurately monitoring fluid pressure.
What You Might Notice
- Transmission shifting harshly or erratically
- Check engine light illuminated
- Transmission may default to limp mode or safe shift pattern
- Possible transmission fluid pressure warning light
- No immediate loss of vehicle drivability but reduced transmission responsiveness
Most Common Causes
- 1
Failed Transmission Fluid Pressure Sensor
The TFPS sensor has internally shorted or failed electrically, causing the signal voltage to remain high. This is the most common cause and requires sensor replacement.
- 2
Short to Power in Signal Circuit
The wiring harness or connector for the TFPS sensor has a short to the positive voltage supply, forcing the signal line to read high voltage continuously.
- 3
Open Ground Circuit to Sensor
The ground wire from the TFPS sensor to the PCM/TCM is broken or disconnected, preventing proper ground reference and causing erratic high readings.
- 4
Corroded or Damaged Connector
The sensor connector pins are corroded, bent, or improperly seated, causing high resistance and incorrect voltage readings at the PCM.
How to Diagnose It
- 1
Check Failed Transmission Fluid Pressure Sensor — The TFPS sensor has internally shorted or failed electrically, causing the signal voltage to remain high. This is the most common cause and requires sensor replacement.
- 2
Check Short to Power in Signal Circuit — The wiring harness or connector for the TFPS sensor has a short to the positive voltage supply, forcing the signal line to read high voltage continuously.
- 3
Check Open Ground Circuit to Sensor — The ground wire from the TFPS sensor to the PCM/TCM is broken or disconnected, preventing proper ground reference and causing erratic high readings.
- 4
Check Corroded or Damaged Connector — The sensor connector pins are corroded, bent, or improperly seated, causing high resistance and incorrect voltage readings at the PCM.
How to Fix It
- 1
Replace Transmission Fluid Pressure Sensor
Remove the old TFPS sensor from the transmission, install a new OEM or quality replacement sensor, and ensure the connector is properly seated. Clear the code and test drive to verify the repair.
- 2
Inspect and Repair Wiring Harness
Visually inspect the TFPS sensor wiring harness for damage, cuts, or pinching. Check for short circuits to power by testing continuity with a multimeter. Repair or replace any damaged sections of wire.
- 3
Clean or Replace Sensor Connector
Disconnect the TFPS sensor connector and inspect pins for corrosion or damage. Clean with electrical contact cleaner and dielectric grease, or replace the connector if pins are bent or severely corroded.
- 4
Test PCM/TCM Ground and Signal Circuits
Use a multimeter to test the voltage at the TFPS sensor connector with the key on. Verify proper ground continuity from the sensor to the PCM. If voltage is abnormally high or ground is open, repair wiring accordingly.
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