ACU 524104.04 – Low Voltage in SCV III Control Lever Sensor. John Deere Hydraulic Alert.

ACU 524104.04 (ACU )

Code: 524104.04



This error code, ACU 524104.04, is triggered when the voltage within the SCV III (Selective Control Valve III) control lever sensor circuit falls below the normal operational threshold. Low voltage may be indicative of issues such as insufficient power supply, degraded wiring, or a failing sensor, which can impair the accuracy and reliability of the control lever’s sensor readings.


Due to the critical nature of accurate sensor feedback for hydraulic control, the System Control Computer (SCC) has disabled the SCV III to prevent potential operational failures and ensure system safety.


  • Inspect the SCV III control lever sensor and its associated circuitry for signs of electrical wear or damage that could be contributing to the low voltage readings.
  • Measure the voltage output at the sensor using a multimeter to confirm that it falls below the required operating range, identifying specific points of failure within the circuit.
  • Check all related wiring and electrical connections for looseness, corrosion, or breaks that could be affecting the voltage levels.
  • Assess the overall power supply to the sensor, including checking power sources like batteries and alternators (if applicable), to ensure they are providing adequate power.
  • If necessary, replace the sensor or repair any defective electrical components discovered during the diagnostic checks. After replacing or repairing, recalibrate the system to ensure the new components function correctly within the overall hydraulic system.


Regular maintenance and monitoring of the electrical components within the hydraulic control system are essential to maintaining operational integrity. Addressing issues like low voltage promptly helps ensure reliable machinery performance and prevents larger system malfunctions.