SV1 004085.12 – SV1 Control Unit Fault

SV1 004085.12 (SV1 4085.12)

Code: 004085.12

Shortcode: 4085.12


This error code, SV1 004085.12, occurs when the software of the Selective Control Valve Unit I (SV I) fails to execute within the allotted time. This can be due to software glitches, hardware issues within the control unit, or external factors affecting the control unit’s performance.


When this error is detected, the SV I may not operate correctly, leading to potential failures in the hydraulic system’s performance and responsiveness.


  • Restart Control Unit:
    • Power cycle the SV I control unit by turning off the vehicle and restarting it to see if the fault clears.
  • Update Software:
    • Ensure that the control unit software is up-to-date to mitigate any software-related execution issues.
  • Inspect Control Unit Hardware:
    • Check the control unit for any signs of hardware failure, including overheating, physical damage, or loose connections. Replace or repair as necessary.
  • Verify Electrical Connections:
    • Ensure all electrical connections to the control unit are secure and free from corrosion or damage.
  • Consult Technical Support:
    • If the issue persists, consult technical support for further diagnostics and potential replacement of the control unit.


Maintaining updated software and performing regular diagnostics on the control unit can help prevent such faults. Follow the manufacturer’s recommendations for software updates and hardware inspections to ensure reliable operation.

Control Units: John Deere

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