Error Code 5100-04-0002: Failed to Change VCI Mode
- Verify that the target control unit is properly installed in the vehicle. (The control unit may not be installed, depending on the vehicle trim level.)
- To change the operating mode of the Vehicle Communication Interface (VCI, VCI2, VCI3), perform a vehicle DTC scan once before starting the ECU upgrade.
- Because the Vehicle Communication Interface (VCI, VCI2, VCI3) can switch from Diagnostic Mode to ECU Upgrade Mode, performing a DTC scan places the Vehicle Communication Interface (VCI, VCI2, VCI3) in Diagnostic Mode and prepares it for the ECU upgrade.
- Test with a spare Vehicle Communication Interface (VCI, VCI2, VCI3) to determine whether the issue is with the interface or the vehicle.
- If this error code occurs during recovery after a software update failure, contact the Vehicle Quality Department or the control unit manufacturer.
Error Code 5021-27-7F24: Security Access Request Failed (Negative Response 24)
- This error occurs when a Negative Response 24 (Request Sequence Error) is received from the control unit.
- Verify that the Vehicle Communication Interface (VCI, VCI2, VCI3) currently in use is operating properly.
- Perform the upgrade test using a spare Vehicle Communication Interface (VCI, VCI2, VCI3).
- Also test the connection between the VCI and tablet PC using both wired and wireless methods (Bluetooth, Wi-Fi Direct).
- If the upgrade still cannot be completed after performing these tests, submit an inquiry and include the Vehicle Identification Number (VIN).
- Inquiries are processed in the order received. Please wait for a response from a service engineer.
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