“User authentication process failed. (Code:4001)” Pop-Up Appears When Logging In

Symptom: The following message window appears when attempting to log in, perform an ECU Upgrade, or use additional functions.

Cause: This message may appear if the security certificate required for secure vehicle communication is missing from the diagnostic tool or is not up to date. 

Resolution:

1) When you log in again, the security certificate downloads in the background. Close the program, restart the diagnostic tool, log in, and check again after several minutes. (The security certificate download is not visible.)

2) If the same symptom occurs after logging in again and the connected Wi-Fi network is restricted, connect to an unrestricted network, such as a mobile hotspot, and try logging in again.

3) If the issue persists after performing the steps above, contact the Customer Service team.