AIC 521407.02 – SCV XIV Control Lever Switch/Sensor Conflict. John Deere AIC System Alert.

AIC 521407.02 (AIC )

Code: 521407.02



This code indicates a malfunction in the SCV XIV (Selective Control Valve XIV) system. The issue arises due to a conflict between the detent switch of the control lever and the sensor voltage readings. The signal voltage of the SCV XIV control lever is either outside of the expected range or does not align with the switch status and potentiometer signal voltage, leading to operational discrepancies.


The control unit has disabled the SCV XIV to prevent incorrect operations and potential safety hazards due to the identified sensor conflict.


  • Inspect the SCV XIV Control Lever and Detent Switch: Check for any signs of mechanical wear, damage, or obstructions that might affect the accurate detection of the lever’s position.
  • Verify Signal Voltage Levels: Use diagnostic equipment to ensure the signal voltages of the SCV XIV control lever are within the normal operating range and accurately reflect lever movements.
  • Examine Electrical Wiring and Connections: Look for any signs of damage or disconnections in the electrical system associated with the SCV XIV lever which might be causing the voltage discrepancies.
  • Rectify Any Identified Problems: Repair or replace any faulty components, ensuring all parts are correctly installed and fully operational.
  • Recalibration and Testing: After addressing the issues, recalibrate the SCV XIV lever settings and conduct comprehensive operational tests to ensure the system functions correctly without further conflicts.


Regular maintenance and precise calibration of control levers and their associated sensors are vital for the reliable operation of hydraulic systems in agricultural machinery. Ensuring sensors and mechanical parts function correctly is key to effective and safe operations. Proactive troubleshooting and maintenance can significantly decrease downtime and enhance the longevity and reliability of the equipment.