Description:

This error code indicates that the switched supply voltage to the Selective Control Valve Unit VI (SV VI) has dropped below 9.0 V. This low voltage condition can be caused by a weak battery, poor electrical connections, or a malfunctioning alternator.

Reaction:

When this error code is detected, the system will log the fault and may display a warning on the operator’s console. The machine may enter a protective mode to prevent damage, potentially limiting the operation of the Selective Control Valve Unit VI.

Recommendations:

Inspect Battery and Charging System:

• Ensure the battery is fully charged and in good condition.
• Check the alternator for proper operation and adequate charging output.

Check Wiring and Connections:

• Inspect the wiring harness and connectors associated with the SV VI for signs of damage, corrosion, or loose connections.
• Repair or replace any damaged components.

Perform VLC Code Diagnostics:

• Since the Vehicle Load Center (VLC) control unit wake-up circuit is a voltage source, it is crucial to perform VLC code diagnostics first.
• Look for other associated codes, such as 000158.XX, in other control units, which may provide additional insights into the voltage issue.

Update Software:

• Ensure that all control unit software, including the VLC, is up-to-date with the latest versions provided by John Deere.

Consult Technical Support:

• If the issue persists after performing the above steps, consult John Deere technical support for further assistance.

Monitor System:

• After performing corrective actions, monitor the system to ensure the fault does not reoccur.

Note:

Associated codes, such as other 000158.XX codes, may be present in other control units. It is important to perform a thorough diagnostic of the Vehicle Load Center (VLC) control unit wake-up circuit first, as it serves as the voltage source. This step can often lead to the identification of the root cause of the issue. Regular maintenance and software updates are crucial to prevent such issues from arising.