Need. After replacing the tailgate, it is also necessary to replace the tailgate in order for the vehicle ecu to better adapt to the tailgate. ECU electronic control unit, also known as "trip computer" and "vehicle computer". 4s shop needs to brush the program to install electric tailgate. In terms of use, it is a special microcomputer controller for automobiles. Like ordinary computers, it consists of microprocessor, memory, input/output interface, analog-to-digital converter and large-scale integrated circuits such as shaping and driving.