When tinkering with cars or other vehicles, being confronted with CAN communication or a similar bus is unavoidable. Throughout the past year, Thibault has been using CAN communication to build an Open Vehicle Control System and using it on a real car. In this talk, Thibault will explain how to get started with CAN reverse engineering, how he made different car parts from different brands talk together, and why Elixir and the Erlang Virtual Machine (the BEAM) is a good candidate for them to quickly prototype ECUs with cheap parts.