Error code occurred during ECU upgrade (5021-27-7F33)

Symptom:
ECU upgrade in progress, error code [5021-27-7F33]

Cause:
The controller has returned a 33 negative response to the ECU upgrade security command. This is likely due to a failure in the security authentication process between the vehicle and the controller during the ECU upgrade.

Resolution:

1. Ensure that the tablet is connected to Wi-Fi or LTE/5G, then log back into the diagnostic application and retry the upgrade.

2. Confirm whether the ECU upgrade was initiated using automatic mode or manual mode.

3. If manual mode was selected, verify that the upgrade was attempted under the correct sub-category that matches the target controller.

4. Check whether the vehicle is fitted with any aftermarket (non-genuine) equipment.

5. Ensure that no work or modifications have been carried out on the gateway installed in the vehicle.

6. If the issue remains unresolved, please contact the controller manufacturer or a certified automotive research institute.

[Further Resources]

• What to Do When an ECU Upgrade Fails

• How to Send the Error Log Report on GDS Smart/KDS2.0

• How to Retrieve ECU Logs from Your Tablet on GDS Smart/KDS2.0

[If the above solutions do not resolve the issue, please contact your distributor or GIT support via the contact details below:]

United States

• KIA: 888-542-4371

• HYUNDAI: 888-437-0308

• GENESIS: 833-681-3926

Canada

• KIA: 888-641-4244

• HYUNDAI: 888-641-4243