SSU 523795.02 – Y49 Steering Control Valve, Fault during Calibration

SSU 523795.02 (SSU )

Code: 523795.02



This diagnostic trouble code (DTC), SSU 523795.02, is triggered when a left/right discrepancy is detected during calibration, or if the signal from the wheel angle sensor is too low at full lock in either direction. This indicates that the hydraulic lines may be mixed up at the steering cylinder.


When this error is detected, the steering system may not calibrate correctly, leading to inaccurate steering control and potential safety issues.


Verify Hydraulic Line Connections:

  • Inspect the hydraulic lines at the steering cylinder to ensure they are connected correctly.
  • Check for any signs of mixed-up or crossed lines.

Inspect Wheel Angle Sensor:

  • Ensure that the wheel angle sensor is functioning properly and transmitting accurate data.

Perform Calibration:

  • Recalibrate the steering system according to the manufacturer’s guidelines.
  • Ensure that the calibration process is followed precisely to avoid discrepancies.

Update Software:

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

Replace Faulty Components:

  • If any hydraulic components or the wheel angle sensor 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 calibration faults.
  • Ensuring proper connections and accurate calibration is crucial for reliable steering performance.

Control Units: John Deere

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