SV2 000158.03 – SV II Switched Supply Voltage High

SV2 000158.03 (SV2 158.03)

Code: 000158.03

Shortcode: 158.03


The error code SV2 000158.03 indicates that the switched supply voltage to the Selective Control Valve Unit II (SV II) has exceeded 16.0 V. This issue can arise due to electrical faults such as a failing voltage regulator, loose or corroded connections, or problems within the Vehicle Load Center (VLC) control unit, which is responsible for the wake-up circuit voltage source.


When this error code is triggered, the equipment may experience erratic behavior or limited functionality in the Selective Control Valve Unit II. This could lead to reduced efficiency or the inability to control specific hydraulic functions properly.


Inspect Voltage Regulator:

  • Ensure the voltage regulator is functioning correctly and providing a stable voltage output. Replace if it is faulty.

Check Electrical Connections:

  • Inspect all electrical connections related to the SV II unit for looseness, corrosion, or damage. Clean, tighten, or replace connections as necessary.

Perform VLC Code Diagnostics:

  • Since the Vehicle Load Center (VLC) control unit wake-up circuit is a voltage source, perform diagnostics on VLC-related codes first to identify and resolve any underlying issues.

Verify Battery Voltage:

  • Check the battery voltage to ensure it is within the recommended range. An overcharged battery can lead to high voltage issues.

Inspect Wiring Harness:

  • Examine the wiring harness for any signs of wear, damage, or shorts that could contribute to voltage irregularities.


Associated codes 000158.XX may appear in other control units. It is essential to perform thorough diagnostics on the Vehicle Load Center (VLC) control unit before addressing the specific SV2 158.03 code. This ensures all potential sources of high voltage are identified and corrected to prevent recurrence.

By following these steps, you can effectively diagnose and rectify the high voltage issue to ensure the proper operation of the Selective Control Valve Unit II and overall equipment reliability.

Control Units: John Deere

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