AIC 523953.03 – High Voltage Detected in Speed Control Lever Sensor. John Deere System Alert.

AIC 523953.03 (AIC )

Code: 523953.03



The error code AIC 523953.03 points to an abnormally high voltage reading from the speed control lever sensor, specifically within systems like AutoPowr™, IVT™, or CommandQuad™. The sensor’s voltage exceeding 4.5 V suggests a possible short to a high voltage source or issues within the wiring harness, such as faulty wiring or insulation breakdown, which can lead to incorrect operation or potential damage to the electronic systems.


In response to the high voltage reading, the control unit has automatically shifted the vehicle’s transmission to PARK. This preventive measure is intended to safeguard the vehicle against unintended movements or mechanical stress that could result from erroneous speed control inputs.


  • Inspect the Speed Control Lever Sensor and Wiring Harness: Examine the sensor and associated wiring for signs of damage, corrosion, or other abnormalities that could contribute to the high voltage issue.
  • Test Electrical Connections and Circuitry: Utilize electrical testing tools to assess the integrity of the circuit and identify any shorts to power sources or other faults in the wiring.
  • Repair or Replace Faulty Wiring or Components: If the inspection reveals compromised wiring or faulty components, repair or replace them to ensure correct voltage levels and restore proper sensor function.
  • Calibrate the Speed Control Lever Sensor: After repairs are made, recalibrate the sensor to ensure it provides accurate voltage readings that correspond to the lever positions.
  • System Reset and Operational Verification: Reset the control system to clear any fault states and perform comprehensive testing to confirm that the speed control lever operates correctly and safely under all conditions.


Maintaining accurate and reliable sensor readings is crucial for the smooth and safe operation of vehicle control systems. Regular checks and immediate attention to issues like abnormal voltage readings are vital to prevent further complications and ensure the machinery remains operational and safe for use.