John Deere 524232.04 – PTI, PTP, or PLC: Low Voltage On The Park Lock Pressure Sensor

Triggered when the control unit detects a voltage of less than 0.3 volts at the signal input for the park lock pressure sensor (B90), indicating the circuit is either shorted to ground or completely open. The park lock system may not function correctly, and the machine may inhibit vehicle motion or enter a 'come home' mode.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7720
• 7820
• 7920
• 8310RT
• 8335RT
• 8360RT
• 9230
• 9330
• 9430
• 9530
• 9630
• 260E
• 310E

1. 1

   Inspect Wiring and Connections: Examine the wiring harness and connectors leading to the B90 park lock pressure sensor. Look for any signs of physical damage, corrosion, or loose connections.

2. 2

   Check for Shorts to Ground: Inspect the circuit for any potential shorts to ground or open circuits that would cause the voltage to drop below 0.3 volts.

3. 3

   Verify Power Supply: Ensure that the 5-volt power supply to the sensor is stable and within the specified voltage range.

4. 4

   Test the Sensor: Use a multimeter or diagnostic tool to verify the functionality of the B90 park lock pressure sensor itself.

1. 1

   Secure the Machine

   Place the tractor's shift lever in Park and shut off the engine.

2. 2

   Access the Sensor

   Locate the B90 Park Lock Pressure Sensor on the transmission or chassis block valve.

3. 3

   Harness Repair

   If the diagnostic checks revealed damaged wiring, a short to ground, or a corroded connector, repair or replace the affected section of the wiring harness.

4. 4

   Sensor Replacement

   If the wiring and 5V reference supply are intact but the sensor fails testing, remove the faulty B90 park lock pressure sensor and install the replacement part.

5. 5

   Clear Codes and Test

   Restart the engine to verify if the active Service Code reappears. Sometimes the code can be corrected by resetting the communication messages when the tractor is restarted. If the code was triggered in 'Come Home Mode,' you may need to perform the specific Park Brake Release Procedure (often found in section 80 of the operator's manual) and wait 5-10 minutes to see if the code returns.