SV2 004085.12 – SV II Control Unit Fault

SV2 004085.12 (SV2 4085.12)

Code: 004085.12

Shortcode: 4085.12


The error code SV2 004085.12 indicates that the software of the Selective Control Valve Unit II (SV II) failed to execute within the allotted time. This issue can occur due to software glitches, memory errors, or issues within the control unit itself.


When this error code is triggered, the equipment may experience malfunctioning or unresponsive behavior in the SV II, leading to impaired hydraulic functions and potential system errors.


Restart the Control Unit:

  • Power cycle the SV II control unit by turning off the equipment, waiting for a few minutes, and then turning it back on to reset the system.

Update Software:

  • Ensure that the software for the SV II control unit is up-to-date. Install any available updates to address software execution issues.

Check for Software Corruption:

  • Verify the integrity of the software. If corruption is detected, reinstall or repair the software as necessary.

Inspect Control Unit Hardware:

  • Examine the control unit for any signs of hardware failure or damage. Replace the control unit if it is found to be faulty.

Consult Technical Support:

  • If the error persists, consult technical support or the manufacturer for further assistance in diagnosing and resolving the software execution issue.


Regular updates and maintenance of the SV II control unit software are essential to prevent execution failures and ensure the reliable operation of the hydraulic control system.

By addressing these areas, you can effectively diagnose and rectify issues related to the SV II not being in the NEUTRAL position and control unit software execution faults.

Control Units: John Deere

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