EPC 000628.12 – Control Unit Internal Fault

EPC 000628.12 (EPC 628.12)

Code: 000628.12

Shortcode: 628.12


This error code, EPC 000628.12, is generated when an electronic malfunction is registered in the control unit. This indicates that there is a problem with the electronic components or circuitry within the control unit.


When this error is detected, the control unit may experience functionality issues, potentially affecting the performance and reliability of the systems it controls. This can lead to degraded performance or unexpected behavior of the equipment.


Inspect Control Unit:

  • Visually inspect the control unit for any signs of physical damage or burnt components. If any damage is found, the control unit may need to be replaced.

Test Electronic Components:

  • Use diagnostic tools to test the electronic components within the control unit. Identify and replace any faulty components.

Update Control Unit Software:

  • Ensure the control unit is running the latest software version. Update the software if necessary to address potential electronic malfunctions.

Check for External Interference:

  • Inspect the surrounding environment for potential sources of electromagnetic interference that could affect the control unit’s operation.

Replace Control Unit:

  • If the electronic malfunction cannot be resolved through the above steps, consider replacing the control unit with a new one.


Maintaining the control unit and its electronic components through regular inspections and updates can help prevent malfunctions and ensure reliable operation. Addressing potential sources of interference can also enhance the control unit’s performance.

Control Units: John Deere

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