RPT 520870.02 – Control Software Internal Fault

RPT 520870.02 (RPT )

Code: 520870.02



This diagnostic trouble code, RPT 520870.02, is generated when there is an error reading the internal module (EEPROM) of the control software. The EEPROM is responsible for storing essential data, and an error in reading it can lead to significant issues in the control software.


When this error is detected, the functionality of the control software is significantly limited or entirely non-functional. This affects the overall performance of the equipment, leading to reduced efficiency or operational capability.


Inspect EEPROM:

  • Check the EEPROM for any signs of physical damage or corruption.
  • Ensure the EEPROM is properly seated and connected.

Reset Control Software:

  • Perform a reset of the control software to see if the issue resolves.
  • Follow manufacturer guidelines for performing a safe reset.

Update Control Software:

  • Ensure that the control software is updated to the latest version.
  • Apply any available patches or updates that address EEPROM reading issues.

Consult Technical Support:

  • If the problem persists, consult with technical support or the equipment manufacturer for further assistance.
  • Provide detailed error logs and diagnostic reports to aid in troubleshooting.

Replace EEPROM:

  • If the EEPROM is found to be faulty, replace it with a new module as per manufacturer specifications.

Monitor System Performance:

  • After addressing the issue, monitor the system for any recurrence of the fault.
  • Keep detailed records of any further errors or irregularities to assist in ongoing troubleshooting.


Issues with the EEPROM can cause significant disruptions in the control software’s operation. Regular maintenance and updates can help prevent such problems.

Control Units: John Deere

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