John Deere 524021.31 – PTR, CAB, ACU, or UIC: Directional Reverser Lever Switch Circuit Fault / Conflict Among Reverser Lever Switches

The control unit has detected a malfunction where the shuttle lever (forward/reverse lever) is sending multiple conflicting signals simultaneously (e.g., indicating both forward and reverse, or neutral and a direction at the same time). The control unit takes a precautionary safety measure by automatically commanding the transmission into PARK or Neutral, disabling vehicle movement.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5045E
• 5055E
• 5065E
• 5075E
• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5090M
• 5115M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5083E
• 7720
• 7820
• 7920

1. 1

   Check the directional reverser lever switch for proper physical operation, ensuring it is not physically stuck, obstructed by debris, or damaged.

2. 2

   Inspect the wiring harness and connectors related to the reverser lever switch circuit for signs of wear, corrosion, loose connections, or short circuits.

3. 3

   Test the switch circuitry using a multimeter or John Deere Service Advisor to verify that the switch provides correct, distinct readings in Neutral, Forward, and Reverse.

4. 4

   Verify that all transmission and control unit fuses and relays are intact and making good contact.

5. 5

   Ensure the PTR/ACU control unit software is up-to-date, applying any available manufacturer patches.

1. 1

   Secure the Machine

   Turn off the engine, place the transmission in PARK, and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Access the Switch

   Remove the steering column shrouds or open the armrest console (depending on where the reverser lever is mounted on your specific model) to access the reverser lever control assembly.

3. 3

   Disconnect Harness

   Carefully unplug the electrical connector from the faulty reverser lever switch.

4. 4

   Remove and Replace

   Unbolt the faulty directional reverser lever switch assembly and install the new replacement unit.

5. 5

   Reassemble

   Reconnect the electrical harness and reinstall the steering column shrouds or armrest covers.

6. 6

   Recalibrate

   Reconnect the battery. After making repairs, recalibrate the reverser lever system (if required by the specific model's service manual) to ensure all switches are correctly synchronized with the control unit.

7. 7

   Clear Codes and Test

   Clear the 524021.31 fault code using a diagnostic tool. Start the tractor and perform a comprehensive operational check, shifting between Forward, Neutral, and Reverse to confirm the issue is resolved and the tractor no longer defaults to PARK.