PLC 328101.31 – B90 Park Lock Pressure Sensor, Supply Voltage Too Low

PLC 328101.31 (PLC )

Code: 328101.31



This diagnostic trouble code is generated when the PLC control unit detects a voltage of less than 4.8 volts at the positive power supply lead for the park lock pressure sensor (B90). This indicates a short to ground in the circuit.


The park lock pressure sensor may not function correctly, potentially affecting the vehicle’s ability to maintain the park lock.


  • Inspect Wiring and Connections:
    • Check for any signs of damage, corrosion, or loose connections in the wiring to the B90 park lock pressure sensor. Repair or replace as necessary.
  • Check for Shorts to Ground:
    • Inspect the circuit for any shorts to ground and rectify any issues found.
  • Test the Sensor:
    • Verify the functionality of the B90 park lock pressure sensor. Replace if faulty.
  • Secure Connections:
    • Ensure all connections are secure and free from contamination.


Regular inspections and maintenance can prevent issues with low voltage in sensor circuits, ensuring the reliable operation of safety-critical systems like the park lock mechanism.

Control Units: John Deere

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