AIC 521404.02 – SCV XI Control Lever Switch/Sensor Conflict. John Deere AIC System Alert.

AIC 521404.02 (AIC )

Code: 521404.02



This error code signifies a malfunction within the SCV XI (Selective Control Valve XI) control lever system. There is a significant conflict between the detent switch and the actual position of the lever. Additionally, the signal voltage from the SCV XI control lever is either out of the specified range or does not correspond with the combined status of the switch and potentiometer signal voltage. These discrepancies can lead to inaccurate operations of the hydraulic control system, potentially affecting machine functionality.


The system has automatically limited the functionality of the SCV XI to mitigate any risk of improper hydraulic operations, which could otherwise lead to inefficiencies or safety hazards.


  • Conduct a thorough inspection of the SCV XI control lever and its detent switch for any signs of mechanical wear or obstruction that might be causing the switch to misalign with the lever’s actual position.
  • Utilize diagnostic tools to measure the signal voltage of the SCV XI control lever to ensure it falls within the correct range and accurately reflects the lever’s movements and settings.
  • Check the wiring and electrical connections of the SCV XI control lever for any damage or faults that could be influencing the signal discrepancies.
  • Rectify any issues found by repairing or replacing the affected components. If adjustments are made to the switch or potentiometer, ensure they are correctly calibrated to match the lever’s operations.
  • After repairs, recalibrate the entire SCV XI system and perform comprehensive testing to ensure all conflicts have been resolved and that the lever operates correctly across its full range of function.


Regular monitoring and precise calibration of control levers and their associated sensors are crucial for maintaining the proper function and safety of hydraulic systems in heavy machinery. Proactive maintenance and timely resolution of sensor conflicts are key to ensuring continuous and reliable equipment performance.