DTI 000158.04 – Low Supply Voltage Detected in Control Unit (ELX)

DTI 000158.04 (DTI 158.04)

Code: 000158.04

Shortcode: 158.04


This diagnostic trouble code (DTC) is generated when the supply voltage at the control unit’s ELX input drops below 9 volts, significantly lower than the standard operating voltage. Such a decrease can impair the functionality of the control unit, leading to slow or unresponsive behaviors, inadequate processing capabilities, and the risk of system shutdowns. Low voltage can be caused by a failing battery, poor charging system performance, or excessive resistance in the electrical circuits.


In response to the low voltage, the control unit might limit the operation of certain functions to conserve power or prevent operational failures. Alerts or error messages might also be displayed to notify the operator of the issue.


  • Inspect and Test the Battery: Evaluate the condition and charge level of the battery. Replace if the battery is old or unable to hold a charge.
  • Review the Charging System: Assess the functionality of the charging system to ensure it is effectively charging the battery and providing consistent voltage.
  • Check Wiring and Connections: Examine all relevant wiring and connections for wear, damage, or corrosion that might impede voltage flow. Repair or replace components as necessary.
  • Regular Electrical System Maintenance: Implement a regular maintenance schedule for the electrical system to detect and rectify issues before they result in low voltage situations.


Maintaining stable and adequate voltage levels is vital for the safe and efficient operation of John Deere machinery. Proactive maintenance and regular checks can help avoid disruptions and extend the operational life of the equipment.

Control Units: John Deere

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