CCU 524016.04 – CCU Switched Supply Voltage Low

CCU 524016.04 (CCU )

Code: 524016.04



This fault code indicates that the switched supply voltage (wake-up voltage) from the Cab Load Center (CLC) control unit to the Chassis Control Unit (CCU) is below the normal operating range. The wake-up voltage, which should be between 12.5 and 14.5 volts, is essential for powering various sensors and control units. Low voltage can affect the operation of these components and is often associated with other low voltage codes for sensors.


The functionality of the CCU and connected sensors is degraded due to insufficient voltage supply. This can affect multiple systems, including sensors for the clean oil reservoir level, clutch disengagement, and primary wheel speed.


  • Inspect Battery and Charging System: Check the vehicle’s battery and alternator to ensure they are providing adequate power. Replace the battery if it is weak or not holding a charge.
  • Check Cab Load Center (CLC) Connections: Ensure that all connections to and from the CLC are secure and free from corrosion or damage.
  • Measure Voltage Levels: Use a multimeter to measure the voltage at the CCU and CLC to confirm low voltage conditions and identify where voltage drops occur.
  • Repair or Replace Faulty Components: Replace any faulty wiring, connectors, or components in the power supply circuit that could be causing low voltage.
  • Monitor Electrical Load: Ensure that the electrical load on the system is within the specified range and that no additional accessories or components are drawing excessive power.
  • System Reset and Calibration: After resolving the issue, reset the CCU and recalibrate any affected sensors and systems to ensure proper operation.


Maintaining stable voltage supply is crucial for the reliable operation of the vehicle’s control systems. Regular maintenance of the electrical system and prompt attention to voltage issues can prevent operational disruptions and ensure system longevity.

Control Units: John Deere

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