EPC 000736.05 – Y40 Gear Selector Solenoid Valve K1, Current Too Low

EPC 000736.05 (EPC 736.05)

Code: 000736.05

Shortcode: 736.05


This error code, EPC 000736.05, indicates that the control unit has registered an open circuit at the signal input of the gear selector solenoid valve K1 (Y40). This results in insufficient current flowing to the solenoid valve, potentially affecting its operation.


When this error is detected, the gear selector solenoid valve K1 may not function correctly, leading to issues with gear selection and overall transmission performance.


Inspect Wiring and Connections:

  • Check the wiring and connections to the gear selector solenoid valve K1 (Y40) for any signs of damage, loose connections, or corrosion. Repair or replace as necessary.

Test Solenoid Valve:

  • Use diagnostic tools to test the gear selector solenoid valve K1 (Y40) for functionality. Replace the solenoid valve if it is found to be defective.

Verify Electrical Supply:

  • Ensure that the electrical supply to the solenoid valve is within the correct range. Check for any issues with the power source or control unit that could affect current flow.

Check for Open Circuits:

  • Use a multimeter to check for open circuits in the wiring leading to the solenoid valve. Repair any detected faults.

Reset and Test System:

  • After addressing the issues, reset the system and test the gear selector solenoid valve K1 to ensure it is operating correctly and that the error code does not reoccur.


Regular maintenance and inspection of the solenoid valves and their associated wiring are crucial for ensuring reliable operation and preventing open circuit issues.

Control Units: John Deere

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