ACU 524021.31 – Conflict Among Reverser Lever Switches

ACU 524021.31 (ACU )

Code: 524021.31



This error code, ACU 524021.31, is triggered when there is a failure or disagreement among one or more of the reverser lever switches. Such conflicts can lead to inconsistencies in the transmission control system’s understanding of the lever position, potentially affecting vehicle operation.


Due to the switch conflict, the control unit takes a precautionary measure by automatically commanding the vehicle into PARK. This position is recoverable once the issue is resolved, allowing for a return to normal operation.


  • Conduct a thorough inspection of all reverser lever switches to identify any that may have failed or are exhibiting signs of malfunction.
  • Test each switch individually to ensure they are functioning correctly and providing consistent feedback to the control system.
  • Check the wiring and connections for each switch for signs of wear, corrosion, or loose connections that could be contributing to the issue.
  • Replace any faulty switches and repair any damaged wiring or connections discovered during the inspection.
  • After making repairs, recalibrate the reverser lever system to ensure all switches are correctly synchronized and operating as intended.
  • Perform a comprehensive system test to confirm that the issue has been resolved and that the control unit no longer commands the vehicle into PARK unexpectedly.


Proper functionality of the reverser lever switches is crucial for accurate transmission control. Regular maintenance and prompt attention to any signs of switch failure are essential to prevent operational disruptions and ensure vehicle safety.