This happens when the software sees the cable, but the cable is not receiving power from the car.
VCDS 16.8 is older than Windows 10/11, which can cause runtime errors (e.g., RT_DLL.DLL errors) or issues with the interface status. Fix 1: Windows Compatibility Mode If the application crashes on startup: Right-click the VCDS icon on your desktop. Select . Go to the Compatibility tab.
Fix 4: "Interface Firmware Out of Date" or Automatic Deactivation