DTC C2203: VIN not Recorded: Operation
WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
AWC-ECU receives chassis number information from the engine control module. (AWC-ECU receives chassis number information from the engine control module via CAN, and writes to AWC-ECU.))