SSU 523767.02 – S123/2 or S142 AutoTrac Resume Switch, Fault in the Engagement Signal

SSU 523767.02 (SSU )

Code: 523767.02



This diagnostic trouble code (DTC), SSU 523767.02, is triggered when a faulty engagement signal is detected from the switch that activates AutoTrac. The switch consists of a changeover contact that allows the engagement signal to be checked. On tractors with CommandArm, switch S123/2 is installed; on tractors without CommandArm, switch S142 is installed.


When this error is detected, the AutoTrac system may not engage correctly, potentially leading to issues with vehicle guidance and operation.


Inspect AutoTrac Resume Switch:

  • Check the AutoTrac resume switch (S123/2 or S142) for proper operation.
  • Ensure the switch is not stuck or malfunctioning.

Verify Switch Connections:

  • Inspect the wiring and connectors related to the AutoTrac resume switch for signs of damage, loose connections, or corrosion.
  • Ensure all connections are secure and free from contaminants.

Update Software:

  • Ensure that the software related to the AutoTrac and resume switch is up-to-date. Apply any available firmware updates to improve system performance and compatibility.

Replace Faulty Components:

  • If the AutoTrac resume switch or related components are found to be defective, replace them with new, genuine parts.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance.


  • Regular maintenance and inspection of the AutoTrac resume switch and its connections can help prevent engagement signal faults.
  • Ensuring the switch is functioning correctly is crucial for the safe and reliable operation of AutoTrac.

Control Units: John Deere

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