DTI 000158.03 – High Supply Voltage Detected at Control Unit (ELX).

DTI 000158.03 (DTI 158.03)

Code: 000158.03

Shortcode: 158.03


This diagnostic trouble code (DTC) indicates that the supply voltage at the ELX input has exceeded the normal operating threshold, specifically registering above 16 volts. High voltage can lead to potential damage to the electrical components and erratic behavior of the control unit.


The control unit may respond by triggering protective shutdowns or by restricting functionality to prevent damage to the system.


  • Check Voltage Regulator and Alternator: Inspect the alternator and voltage regulator for proper operation. These components are typically responsible for maintaining appropriate voltage levels supplied to the control unit.
  • Inspect Electrical Connections and Wiring: Look for any signs of loose connections, corrosion, or damaged wires that may contribute to voltage fluctuations.
  • Verify System Voltage with Multimeter: Use a multimeter to measure the voltage levels being supplied to the control unit to ensure they are within specified limits.


Maintaining correct voltage levels is crucial for the reliable operation of the control unit. Continuous monitoring and timely maintenance can prevent damage and ensure operational efficiency.

Control Units: John Deere

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