SSU 523826.10 – B139 Steering Angle Sensor, Signals from Steering Wheel Position Sensor (B138) Not Recognized

SSU 523826.10 (SSU )

Code: 523826.10



This diagnostic trouble code (DTC), SSU 523826.10, is triggered when a movement is detected by the wheel angle sensor (WAS) but not by the steering input device (SID). This indicates a discrepancy between the steering wheel input and the actual steering motion detected by the wheel angle sensor.


When this error is detected, the steering system may not respond accurately to steering inputs, potentially leading to issues with vehicle control and safety.


Inspect Steering Wheel Position Sensors:

  • Check the steering wheel position sensors (SID) for proper operation and signal transmission.
  • Ensure the sensors are securely mounted and properly connected.

Verify Sensor Signals:

  • Use diagnostic tools to verify the signals from both the steering wheel position sensors and the wheel angle sensor.
  • Ensure that the signals are consistent and within the expected range.

Check for Mechanical Issues:

  • Inspect the steering mechanism for any signs of looseness, wear, or mechanical play that could cause discrepancies in sensor readings.
  • Tighten or replace any worn components as necessary.

Update Software:

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

Replace Faulty Components:

  • If any of the sensors 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 can help prevent discrepancies between sensor readings.
  • Ensuring accurate sensor alignment and calibration is crucial for reliable steering performance.

Control Units: John Deere

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