CRU 000168.04 – Low Supply Voltage Detected in Control Software. John Deere System Advisory.

CRU 000168.04 (CRU 168.04)

Code: 000168.04

Shortcode: 168.04


Error code CRU 000168.04 is triggered when the control software of the radio unit (CRU) detects a supply voltage (BAT) below 7 volts. This low voltage situation can indicate issues with the battery, electrical connections, or the charging system, potentially leading to insufficient power being supplied to operate the control software effectively.


The low voltage condition causes the control software to function with limited capability or not operate at all, as a protective measure to prevent incorrect operation or damage to the system.


  • Inspect Battery Health and Charge Level: Check the battery’s state of charge and overall health. A weak or nearly depleted battery may need recharging or replacement.
  • Evaluate Charging System Performance: Ensure that the alternator and charging system are properly charging the battery. A malfunctioning alternator could result in low voltage output.
  • Check Electrical Connections and Wiring: Examine all related electrical connections and wiring for loose, corroded, or damaged components that could impact voltage delivery.
  • Use a Multimeter to Test Voltage Outputs: Measure the actual voltage levels at different points in the electrical system, focusing on the supply to the CRU, to ensure they meet required specifications.
  • Reset and Re-test the Control Software: After addressing any issues, reset the control software to clear the error state. Re-test the system to confirm that the supply voltage is now stable and adequate.


Regular maintenance of the vehicle’s electrical system, including the battery and charging system, is vital to prevent issues like low voltage. This ensures that all electronic components receive the correct voltage for optimal performance. Addressing voltage issues promptly helps maintain the functionality and reliability of the control software.

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