Applicable error codes:
5021-27-7F35
2300-01-000C
Symptom: Error code [5021-27-7F35] occurs during an ECU upgrade.
Cause: The control unit sends a negative response to the ECU upgrade security command.
Resolution:
1. Confirm whether the ECU upgrade was performed in Auto Mode or Manual Mode.
2. If it was performed in Manual Mode, confirm that the ECU upgrade was attempted using the correct subcategory for the control unit.
3. Check whether any aftermarket equipment is installed in the vehicle.
4. Check whether the control unit installed in the vehicle has previously been replaced.
5. If the issue persists, contact the control unit manufacturer or the Kia Research and Development Center.
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