Kia KDS 2.0 Troubleshooting: Error Code 4001 During Login, ECU Upgrade, or S/W Management – Customer Support | GIT America

This article explains how to resolve error code 4001, which may appear when you log in or attempt to use ECU Upgrade or S/W Management on KDS 2.0. In most cases, the issue is caused by a missing or outdated security certificate required for secure communication with the vehicle.

Applies to

Diagnostic tool: KDS 2.0
Features: Login, ECU Upgrade, S/W Management
Network: Wi-Fi / Hotspot

Symptom

Error code 4001 appears when you log in or access ECU Upgrade or S/W Management.

Error code 4001 screen

Cause

This error may occur when the required security certificate is missing from the diagnostic tool or is not current. This certificate is required for secure communication with the vehicle.

Resolution

Step 1) Trigger the background download of the security certificate

Log out, and then fully exit or close the diagnostic application.
Clear the application cache and data: Troubleshooting: Error message "4001"
Restart the diagnostic tool.
Connect the diagnostic tool to a stable Wi-Fi network.
Log in again.
Wait a few minutes, and then try ECU Upgrade or S/W Management again.

Note: The security certificate downloads in the background. Therefore, download progress may not appear on the screen.

Step 2) Try a different network (hotspot)

If the same issue occurs after completing Step 1, connect to an unrestricted network, such as a mobile hotspot. Then log in again and retry the feature.

Step 3) Remove aftermarket devices (if installed)

If an aftermarket device, such as a dashcam, is installed in the vehicle, temporarily remove or disconnect it and retry S/W Management.

Step 4) Reset vehicle power (battery negative terminal)

Disconnect the vehicle battery negative terminal for more than 10 minutes. Then reconnect it and retry the operation.

If the issue persists

Confirm that the diagnostic tool is connected to a Wi-Fi network or hotspot with internet access.
After logging in, wait 3–5 minutes to allow the certificate to download in the background, and then retry.
If possible, test the diagnostic tool using a different network.