Hello.
If the **User Authentication Failed (Error Code 4001)** message continues to appear while using KDS 2.0, please review the information below.
■ Main Cause
This error may occur when there is a temporary delay while downloading the server security certificate (HSM certificate).
■ Corrective Action
Follow the steps below to verify and resolve the issue.
-
Log in again
- After logging in successfully, make sure the Login Successful pop-up appears at the bottom of the screen.
-
Wait for the certificate download
- After logging in, wait approximately 1–2 minutes to allow the certificate download to complete successfully.
-
Establish vehicle communication
- Then proceed with vehicle communication as usual.
■ Expected Improvement Schedule
An improvement for this issue
is scheduled to be included in the regular release update on May 26, 2026.
■ Additional Information
We apologize for any inconvenience.
If the same issue continues to occur, please contact the Customer Support Center.
Thank you.
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