EPC 523677.04 – S158 Declutch Switch on Range Shift Lever, Signal Voltage Too Low

EPC 523677.04 (EPC )

Code: 523677.04



This error code, EPC 523677.04, indicates that the voltage value of the declutch switch on the range shift lever is compared to the tractor system voltage. The diagnostic trouble code is generated if the EPC control unit detects that the signal voltage in the circuit of the declutch switch is too low when the declutch switch on the range shift lever is actuated. This can occur due to:

  • A defective declutch switch on the range shift lever.
  • Signal voltage of the declutch switch shorted to ground or an open circuit (broken lead, terminal slid off, loose wire).


When this error is detected, the declutch switch may not function correctly, leading to issues with shifting and overall vehicle operation.


Inspect Declutch Switch:

  • Check the condition of the declutch switch on the range shift lever. Replace the switch if it is found to be defective.

Verify Signal Voltage:

  • Inspect the circuit for any signs of the signal voltage shorting to ground or open circuits. Repair any detected faults.

Check Wiring and Connections:

  • Ensure that all wiring and connections to the declutch switch are secure and free of damage. Repair or replace any broken leads, terminals, or loose wires.

Test Switch and Circuit:

  • Use diagnostic tools to test the declutch switch and its circuit for proper functionality. Ensure that the signal voltage is within the correct range when the switch is actuated.

Reset and Test System:

  • After addressing the issues, reset the system and test the declutch switch to ensure it operates correctly and that the error code does not reoccur.


Regular inspection and maintenance of the declutch switch and its associated wiring are crucial for ensuring reliable operation and preventing voltage issues.

Control Units: John Deere

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