SSU 523826.13 – B139 Steering Angle Sensor Not Calibrated

SSU 523826.13 (SSU )

Code: 523826.13



This diagnostic trouble code (DTC), SSU 523826.13, is triggered when the wheel angle sensor (WAS) is found to have an invalid calibration, or is not yet calibrated.


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


Perform Calibration:

  • Calibrate the wheel angle sensor (WAS) following the manufacturer’s guidelines to ensure accurate readings.
  • Ensure the calibration process is followed precisely to avoid discrepancies.

Verify Sensor Functionality:

  • Ensure that the wheel angle sensor (WAS) is functioning properly and capable of being calibrated.

Update Software:

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

Replace Faulty Components:

  • If the wheel angle sensor (WAS) is found to be defective, replace it with a new, genuine part.

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 ensure accurate calibration.
  • Ensuring proper sensor functionality and accurate calibration is crucial for reliable steering performance.

Control Units: John Deere

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