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