A vehicle network interface tool electrically connects a computing device to an electronic control unit of a motor vehicle. The vehicle network interface tool includes a vehicle communications port to receive vehicle network data from the electronic control unit of the motor vehicle. A crypto-processor decrypts the vehicle network data and creates computing device readable data. A main processor receives the computing device readable data and transmits it to a computing device port. A computing device port is in electrical communication with the main processor. The computing device receives the computing device readable data from said main processor and transmits the computing device readable data to the computing device for analysis. Being able to receive and decrypt encrypted data keeps the integrity of the ECU security preventing hacks to the ECU.