1. Symptom
A message displaying error code 5021-34-7F40 appears during the ECU Update process.
2. Causes
The software being installed is not compatible with the controller specifications.
The Update procedure may not comply with the instructions in the Technical Service Bulletin (TSB).
3. Resolution
Verify the software and controller specifications before performing the Update.
Ensure that the correct software version is selected for the specific controller model.
Check the ECU Part Number and ROM ID, together with the VIN, to confirm compatibility.
Review the relevant TSB to confirm the correct Update procedure and any additional requirements.
Adjust the settings or follow an alternative procedure as specified in the TSB, if required.
4. Additional Support
For further assistance, please contact one of the following support numbers.
USA
KIA 888-542-4371
HYUNDAI 888-437-0308
GENESIS 833-681-3926
CANADA
KIA 888-641-4244
HYUNDAI 888-641-4243
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