RLC 000158.04 – Control Software, Supply Voltage (ELX) Too Low

RLC 000158.04 (RLC 158.04)

Code: 000158.04

Shortcode: 158.04


This error code indicates that the supply voltage (ELX) has dropped below 9 volts. Such low voltage levels can be caused by a failing battery, poor electrical connections, or issues with the charging system.


When this error is detected, the control software may experience limited or no functionality, affecting the performance or operation of specific electronic control systems within the equipment.


  • Check Battery Health:
    • Test the battery to ensure it holds a charge and is in good condition. Replace the battery if it is old or unable to maintain adequate voltage.
  • Inspect Electrical Connections:
    • Inspect all electrical connections, including those at the battery and control software. Ensure they are clean, secure, and free from corrosion.
  • Verify Charging System:
    • Check the alternator and voltage regulator for proper operation. Ensure they are charging the battery correctly. Replace faulty components as necessary.
  • Examine Wiring:
    • Inspect the wiring harness for any signs of wear, damage, or corrosion. Repair or replace any compromised wiring.


Consistently low supply voltage can cause long-term damage to the control software and other electronic components. Regular maintenance of the electrical system is crucial to prevent such issues.

Control Units: John Deere

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