SSU 523826.07 – B139 Steering Angle Sensor, Control Unit Recognizes No Signals

SSU 523826.07 (SSU )

Code: 523826.07



This diagnostic trouble code (DTC), SSU 523826.07, is triggered when the SSU control unit fails to detect a signal from the wheel angle sensor (WAS) during calibration, despite steering movement being made. The signal from the WAS must be above 1.5 volts when moving from the right steering stop to the left steering stop.


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


Inspect Wheel Angle Sensor:

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

Verify Sensor Signals:

  • Use diagnostic tools to verify the signals from the wheel angle sensor during calibration.
  • Ensure that the signals are above 1.5 volts when moving from right to left steering stop.

Perform Calibration:

  • Recalibrate the steering system following the correct procedure to ensure accurate alignment and configuration of the sensor.
  • Follow the manufacturer’s guidelines for the calibration process.

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 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 signal detection issues.
  • Ensuring proper sensor functionality and accurate calibration is crucial for reliable steering performance.

Control Units: John Deere

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