John Deere 524195.03 – Rear Chassis Module (PLC): High Voltage On The Park Lock Pressure Sensor

The control unit detects a voltage exceeding 4.8 volts at the signal input for the park lock pressure sensor (B90), indicating a short to a supply lead (5-volt or 12-volt). The park lock system may not function correctly, potentially compromising the vehicle's ability to remain securely parked.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R

1. 1

   Inspect the wiring harness and connectors leading to the B90 park lock pressure sensor for physical damage, loose connections, or corrosion.

2. 2

   Using a multimeter, inspect the circuit (measured at pin 27 / lead 669 on the PLC connector X382) for any shorts to a 5-volt or 12-volt supply lead.

3. 3

   Ensure all connections are clean, secure, and free from dirt or contamination.

4. 4

   Verify the operation of the B90 park lock pressure sensor itself to see if the internal circuitry has failed causing the high voltage reading.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Locate the Sensor

   Locate the B90 Park Lock Pressure Sensor on the transmission/rear chassis area.

3. 3

   Harness Inspection & Repair

   Disconnect the sensor and inspect the connector pins. If the wiring harness is damaged, chafed, or shorting to a power source, repair or replace the affected section of the wiring harness.

4. 4

   Sensor Replacement

   If the wiring tests perfectly fine and the short to power is isolated to the sensor itself (defective sender), remove the faulty B90 Park Lock Pressure Sensor and install a new one.

5. 5

   Reassembly

   Reconnect the sensor harness, ensuring the connector is fully seated and locked.

6. 6

   Clear Codes and Test

   Reconnect the battery, turn the key on, and clear the stored fault codes from the PLC. Test the park lock mechanism to ensure the code does not return and the tractor holds securely in park.