Every Transmission Control Unit (TCU) has what's known as a Box Code, Revision, and model. This number indicates the factory version of software on your TCU. With this information, we can check compatibility of available features and files for your exact TCU. To find this information, you can use a VAG-Com/VCDS OBD-II cable. Start by plugging in the cable, then turn the key to the on position and launch the program.