SSU 000628.02 – Control Unit Internal Fault

SSU 000628.02 (SSU 628.02)

Code: 000628.02

Shortcode: 628.02


This diagnostic trouble code (DTC), SSU 000628.02, is triggered when a fault occurs within the internal module (EEPROM) of the control unit. This indicates an internal malfunction that can affect the overall performance and reliability of the control unit.


When this error is detected, the equipment may experience reduced functionality or fail to operate correctly. Critical systems dependent on the control unit may be compromised.


Perform a System Reset:

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

Update Software:

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

Check Power Supply:

  • Verify that the 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 module (EEPROM) or other components within the control unit are found to be defective, replace the 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 in identifying and resolving the issue.


  • 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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