This article explains the cause of "Code 100" (TimeStamp error)—which occurs when background security certificate download fails due to a clock synchronization mismatch after logging in to GDS Smart (including GDS Smart RND) / KDS 2.0 / GENESIS Smart—and provides step-by-step resolution instructions using Automatic Date & Time (UTC) settings.
Applicable Products & Environment
- Hyundai: GDS Smart / GDS Smart RND
- Kia: KDS 2.0
- Genesis: GENESIS Smart
- Supported Hardware: VCI3 (VCI III), VCI II(2)
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1. Symptoms & Cause: Code 100 After Login (TimeStamp & Security Certificate Error)
When logging in to the diagnostic application (GDS Smart / GDS Smart RND / KDS 2.0 / GENESIS Smart), the following symptoms may occur:
Key Error Messages & Symptoms
- Error Code: A "Code: 100" (or "Code 100") pop-up appears and blocks vehicle diagnostic functions and ECU software updates.
- Administrator Prompt: A pop-up instructs the user to contact the local administrator.
- Session Status Display: Password authentication succeeds—a brief toast notification and remaining session timer (e.g., 6d 23h) appear—but the error dialog immediately follows and locks vehicle communication.
Root Cause
- Security Certificate Download Failure: This error occurs when user login succeeds on the server, but the subsequent background security certificate download process fails.
- TimeStamp Mismatch (Code 100): Code 100 specifically indicates a TimeStamp verification error between the authentication server and the tablet. The diagnostic app validates login and security certificates based on UTC (Coordinated Universal Time). If Automatic Date & Time is disabled or the tablet clock/time zone was manually changed, a timestamp discrepancy occurs and triggers Code 100.
2. Step-by-Step Resolution (Automatic Date & Time Settings)
Warning — Do Not Manually Change Tablet Local Time or Region: Authentication and security certificate validation are processed based on UTC time. You do not need to manually change the tablet's local region or time zone when operating across different regions. Always keep Date & Time set to Automatic.
- Enable Automatic Date and Time on the Tablet: On the Android tablet, go to Settings > General Management > Date and Time, and turn ON both Automatic date and time and Automatic time zone.
- Keep Location Services Enabled: When the diagnostic app prompts you to turn on Location at startup, keep Location ON.
- Check Network Connectivity: Strict corporate firewalls may block security certificate downloads. Connect the tablet to an unrestricted Wi-Fi network or a smartphone mobile hotspot (tethering).
- Restart the App, Log In Again, and Wait 2–3 Minutes: Log out of the diagnostic app, close it completely, and relaunch it. Log in again and wait 2 to 3 minutes on the main screen so the security certificate finishes downloading in the background before starting vehicle diagnostics.
3. Related Help Center Guides
For additional instructions on security certificate synchronization and login troubleshooting, refer to the official guides below:
Security Certificate (HSM) & User Authentication Troubleshooting
- Troubleshooting: HSM Certificate Error During ECU Upgrade (GDS Smart / KDS 2.0 / GENESIS Smart) — Background security certificate synchronization procedure (waiting 2–3 minutes after login)
- Troubleshooting: Error Code 4001 (Login / ECU Upgrade / S/W Management) — Re-login and mobile hotspot steps when security certificates expire or fail to download
- Hyundai GDS Smart | Error Code 101 / 4001 on GDS Smart (NEH, NVH, NWH) — Resolving login-stage (Code 101) and security communication-stage (Code 4001) errors
Tablet Date/Time (TimeStamp) & Login Failure Resolution
- How to resolve login failure for GDS Smart / GENESIS Smart / KDS 2.0 — Checking password special characters (&) and enabling Automatic Date & Time
- When I authenticate or log in Smart Launcher, I got a message, "1006 or TimeStampError". — Resolving TimeStampError caused by tablet clock mismatch
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