PCM (ECM/TCM): EMS VIN Data Error
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
The ICU (Immobilizer Control Unit) supplies power to the coil antenna, receives and analyses signals from the transponder, transmits signals to the engine ECM and stores VIN (Not the number on the bulkhead of vehicle but Vehicle Identification Number for Immobilizer) data comprised of an ID code and password.