The Controller Area Network (CAN) is a complex bus designed for automobiles to connect automotive devices without the use of a central computer. Through this communication network, controllers exchange operating parameters and commands. Each device has programmed information, which is related to the messages to be exchanged through the serial data circuits.
When the DTC U0418 OBDII code is stored, it is because a receiving device detected inconsistencies with the information sent by the Brake System Control Module, interpreting this situation as a malfunction.
Keep in mind that the u0418 OBD2 diagnostic code is a typical error present in many cars, so this DTC fault is not found only in one brand but will be seen in other car manufacturers all over the world.