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.
Solution:
1. Check whether the ECU upgrade was performed in Auto Mode or Manual Mode.
2. If the upgrade was performed in Manual Mode, verify that the correct subcategory for the control unit was selected.
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 vehicle R&D center.
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