AIC 521406.02 – SCV XIII Control Lever Switch/Sensor Conflict. John Deere AIC System Alert.

AIC 521406.02 (AIC )

Code: 521406.02



This error code identifies a malfunction within the SCV XIII (Selective Control Valve XIII) system, indicating that the detent switch of the control lever is in conflict with the lever’s actual position. There are discrepancies in the signal voltage of the SCV XIII control lever, which either exceeds the expected range or does not align with the switch status and potentiometer signal voltage, causing operational anomalies.


The system has initiated a limited function mode to mitigate the risk of operational errors or potential safety issues due to the detected discrepancies.


  • Inspect and Adjust the SCV XIII Control Lever and Detent Switch: Look for any mechanical wear, damage, or obstructions that could interfere with the accurate detection of the lever position.
  • Measure and Validate Signal Voltages: Utilize diagnostic tools to check and confirm that the signal voltages of the SCV XIII control lever are within acceptable limits and accurately reflect the movements of the lever.
  • Examine Electrical Connections: Investigate the electrical connections and wiring associated with the SCV XIII lever to ensure there are no faults or loose connections contributing to the voltage issues.
  • Rectify Identified Issues: Proceed to fix or replace any malfunctioning components, making sure all elements are properly integrated and operational within the system.
  • Recalibration and Comprehensive Testing: After repairs or modifications, recalibrate the SCV XIII lever settings and conduct exhaustive tests to verify that the system is operating correctly without further conflicts between sensors.


Maintaining regular checks and timely maintenance of the control levers and sensors in agricultural machinery is crucial to prevent unexpected failures and ensure optimal operation. Accurate sensor readings and proper mechanical function are essential for efficient and safe machine performance. Proactive maintenance and quick responses to early signs of trouble can significantly enhance the reliability and longevity of the equipment.