1. Symptom
A message with error code 5021-34-7F40 appears during the ECU update process.
2. Causes
The software being updated is not compatible with the controller specifications.
The update procedure may not align with the Technical Service Bulletin (TSB) instructions.
3. Resolution
Verify the software and controller specifications before updating.
Ensure that the correct software version is selected for the specific controller model.
Check the part number and ROM ID of the ECU along with the VIN to confirm compatibility.
Review the relevant TSB to confirm the correct update procedure and any additional requirements.
Adjust settings or follow alternative procedures as specified in the TSB if needed.
4. Additional Support
Please contact one of following numbers for further assistance.
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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