SSU 523651.02 – Control Unit Internal Fault

SSU 523651.02 (SSU )

Code: 523651.02



This diagnostic trouble code (DTC), SSU 523651.02, is triggered when an internal fault occurs in the SSU control unit. This indicates a malfunction within the control unit itself.


When this error is detected, the control unit may not function correctly, potentially affecting the performance and reliability of the steering system.


Perform a System Reset:

  • Try resetting the SSU control unit to clear temporary faults. Follow the manufacturer’s procedure for performing a system reset.

Update Software:

  • Ensure that the SSU software is up-to-date. Apply any available firmware updates to address potential software-related issues.

Check Power Supply:

  • Verify that the SSU control unit is receiving a stable power supply within the specified voltage range.
  • Inspect the power connections for any signs of damage or loose connections.

Replace Faulty Components:

  • If the internal fault persists, replace the SSU control unit 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 control unit and its connections can help prevent internal faults.
  • Keeping the control unit firmware up-to-date ensures compatibility and reliability of the vehicle’s systems.

Control Units: John Deere

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