CCU 001079.04 – CCU Sensor Supply Voltage Low

CCU 001079.04 (CCU 1079.04)

Code: 001079.04

Shortcode: 1079.04


This fault code indicates that the voltage supplied to the sensors is below the normal operating range, specifically falling below 4.8 volts. Low voltage can impair the sensors’ ability to accurately detect and transmit data, potentially affecting the overall functionality of various control systems within the vehicle.


The control unit restricts certain functions as a safety measure to prevent misinterpretations of sensor data or further complications arising from inadequate voltage supply.


  • Voltage Measurement: Utilize a multimeter to measure the actual voltage levels in the sensor supply circuit to verify the low voltage condition.
  • Inspect Wiring and Connections: Check for any signs of wear, damage, or loose connections in the wiring that could be causing voltage drops. Repair or replace as necessary.
  • Battery and Charging System Check: Ensure that the battery is in good condition and that the charging system is providing adequate power. Replace or repair if deficiencies are detected.
  • Regulator and Circuit Checks: Examine any voltage regulators and associated circuit components to ensure they are functioning correctly and providing stable voltage to the sensors.
  • System Reset and Function Test: After repairs, reset the control unit and conduct functional tests to ensure that all sensors receive proper voltage and function as intended.


Maintaining proper voltage levels is crucial for sensor accuracy and reliability. Regular electrical system checks can help prevent issues related to low voltage and ensure stable vehicle operation.

Control Units: John Deere

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