SSU 523789.02 – No Wheel Angle Sensor Detected

SSU 523789.02 (SSU )

Code: 523789.02



This diagnostic trouble code (DTC), SSU 523789.02, is triggered when the Steering System Control Unit (SSU) detects that the wheel angle sensor (flow meter or axle) is not responding upon powering up. This indicates that the sensor is either malfunctioning or not communicating with the SSU.


When this error is detected, the steering system may not function correctly, potentially leading to inaccurate steering angle readings and compromised vehicle control.


Inspect Wheel Angle Sensor:

  • Check the wheel angle sensor for proper operation and signal transmission.
  • Ensure the sensor is securely mounted and properly connected.

Verify Sensor Connections:

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

Update Software:

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

Replace Faulty Components:

  • If the wheel angle sensor 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 steering system components can help prevent sensor detection issues.
  • Ensuring the electrical system is properly regulated can avoid interruptions in sensor operation.

Control Units: John Deere

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