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Hyundai GDS Smart | Error Code 101 / 4001 on GDS Smart (NEH, NVH, NWH)

Oscar Eom
Updated

✔ RESOLVED — This issue has been fully resolved as of June 4, 2026, 2:00 PM (KST) / 05:00 AM (UTC). No further action is required. If you still encounter the error, please log out of GDS Smart and log back in.

 

Dear Customer,

We would like to inform you of a known issue currently affecting some users of GDS Smart. We sincerely apologize for any inconvenience this may cause.

Affected versions

GDS Smart NEH, NVH, and NWH
GDS Smart | How to Check and Update the Diagnostic App Version

Affected regions

Asia-Pacific, Oceania, Latin America, Europe, Africa, Middle East, and Russia & CIS

 

Symptoms

When performing functions that require secure vehicle communication — such as controller (ECU) diagnostics (including 'Fault Code Searching' and related features), 'S/W Management', and 'ECU Upgrade' — one of the following error codes may appear:

Error Code 4001
Displayed while attempting to run functions that require secure vehicle communication (ECU/controller diagnostics including 'Fault Code Searching' and related diagnostic features, 'S/W Management', 'ECU Upgrade', etc.).

Error Code 101
Displayed at the login stage.

 

Temporary Workaround

 

Quick fix: In most cases, simply logging out of GDS Smart and logging back in will resolve the symptoms, as a temporary fix has already been applied on our servers.

Temporary fix applied: June 4, 2026, 12:00 PM (KST) / 03:00 AM (UTC)

Important: The steps below were provided as a temporary workaround while the issue was being addressed. Now that the issue has been fully resolved, they are no longer required, but are kept here for reference in case you still encounter the error.

If logging out and logging back in does not resolve the issue, the following steps may help restore the affected functions:

  1. Log out of the diagnostic app (GDS Smart).
  2. Fully close the app, including any instance running in the background.
  3. Relaunch the diagnostic app.
  4. Log in — but do not connect the VCI at this stage.
  5. Wait approximately 3 minutes.
  6. Connect or pair the VCI.
  7. Check whether the affected features are now working.
  8. If the issue persists, clear the app's cache and data, then relaunch and try again:
    • Open Settings on the tablet.
    • Tap Apps, then select the diagnostic app (GDS Smart).
    • Tap Storage (or Storage & cache).
    • Tap Clear cache, then tap Clear data (also shown as Clear storage) and confirm.
    • Relaunch the app and log in again.
  9. If it still fails, connect your tablet to a mobile hotspot and test again, as the problem may be related to your current network connection.

Please note: Clearing the app data resets the app to its default state, so you may need to re-enter your login details afterward.

 

Resolution

 

This issue has now been fully resolved. After identifying the root cause as a server-side issue, we applied a temporary fix to mitigate the symptoms and subsequently completed a permanent fix. All affected functions should now operate normally, and no further action is required on your side.

Timeline (June 4, 2026)

  • 12:00 PM (KST) / 03:00 AM (UTC) — Temporary server-side fix applied; symptoms mitigated.
  • 2:00 PM (KST) / 05:00 AM (UTC) — Permanent fix completed; issue fully resolved.

 

We appreciate your patience and understanding while we work toward a resolution. If you have any further questions, please don't hesitate to contact us.

 

 

Quality-Service Team, GIT

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