ACU 524105.02 – SCV II Lever Switch and Sensor Voltage Conflict. John Deere Hydraulic System Alert

ACU 524105.02 (ACU )

Code: 524105.02



This error code, ACU 524105.02, occurs when there is a discrepancy between the SCV II (Selective Control Valve II) control lever switch position and the voltage readings from its sensor. Such a conflict can indicate an issue in either the switch mechanism or the sensor’s ability to accurately reflect lever position through electrical signals.


Due to the potential for incorrect hydraulic operations resulting from this sensor-switch mismatch, the System Control Computer (SCC) has disabled the SCV II to prevent unintended machinery actions and ensure operational safety.


  • Conduct a thorough inspection of both the SCV II control lever switch and the corresponding sensor to check for mechanical wear, electrical faults, or misalignments that could be causing the voltage discrepancies.
  • Test the voltage outputs when the SCV II lever is in various positions to verify whether the sensor accurately tracks the switch’s movements. Utilize diagnostic tools to measure and record these voltage levels.
  • Check all wiring and connections related to the SCV II switch and sensor for any issues such as loose connections, corrosion, or damaged wires that could be impacting signal integrity.
  • Recalibrate or adjust the sensor and switch to align their outputs. Ensure both components are properly synchronized according to the manufacturer’s specifications.
  • If recalibration does not resolve the issue, consider replacing the faulty switch or sensor to restore proper function. Ensure that any new components are correctly installed and integrated into the control system.


Proper synchronization between mechanical switches and electrical sensors is crucial for the accurate operation of hydraulic controls. Regular maintenance and diagnostics are recommended to detect and correct any discrepancies early, thus maintaining the reliability and efficiency of the machinery’s hydraulic system.