AIC 523953.02 – Speed Control Lever Sensor Circuit Conflict. John Deere System Alert.

AIC 523953.02 (AIC )

Code: 523953.02



The error code AIC 523953.02 indicates a conflict between the voltage readings from channels 1 and 2 of the speed control lever sensor. This discrepancy points to an improper voltage ratio, which suggests there may be a malfunction in the sensor unit or the circuitry connecting these channels. Such a conflict could lead to inaccurate interpretations of the lever’s position, potentially affecting the vehicle’s speed control operations.


As a result of this sensor conflict, the control unit has issued a command to set the vehicle’s transmission to PARK. This safety measure prevents unintended movements that could occur due to erroneous sensor inputs, ensuring both operator and machine safety.


  • Inspect the Speed Control Lever Sensor: Check the sensor for any signs of physical damage, corrosion, or connection issues that might affect its operation. Ensure the sensor unit is clean and securely mounted.
  • Diagnose Circuit Issues: Use diagnostic tools to examine the electrical circuitry associated with channels 1 and 2 of the speed control lever sensor. Focus on identifying any shorts, opens, or irregular resistance that could be causing the voltage conflict.
  • Repair or Replace Faulty Components: If any circuitry problems or faulty sensor components are discovered, proceed with repairs or replace the damaged parts to restore proper function.
  • Calibrate the Sensor: After any necessary repairs, recalibrate the speed control lever sensor to ensure accurate voltage readings and proper channel alignment.
  • System Reset and Functional Testing: Reset the control system to clear any commands or fault states. Perform thorough testing to verify that the speed control lever and its sensor are operating correctly, and that there is no longer a conflict in the sensor voltages.


Regular calibration and maintenance of sensors and electrical systems are crucial for the reliable operation of machinery controls. Ensuring that all components are functioning correctly and that sensor readings are accurate helps prevent mechanical failures and enhances the safety and efficiency of operations. Addressing issues promptly when discrepancies like voltage conflicts are detected is essential to maintaining operational integrity and avoiding downtime.