CAN Bus

The CAN bus protocol was developed by the German automotive and industrial supplier Bosch, with the specification first officially released in 1986. It was created to address the growing complexity and weight of automotive wiring harnesses by allowing multiple electronic control units to share a single communication bus.

Before CAN bus, each electronic control unit in a car required dedicated point-to-point wiring to every other unit it needed to communicate with, resulting in thick, heavy, and complex wiring harnesses. CAN bus allows all ECUs — from the engine controller to the ABS module to the instrument cluster — to exchange data over a shared two-wire serial bus without a central host computer.

Yes, CAN bus remains the most widely deployed in-vehicle communication protocol in the automotive industry. Modern vehicles typically run multiple CAN networks at different speeds — a high-speed bus for critical systems like engine and transmission control, and slower buses for body and comfort electronics.

Automotive Ethernet and the upgraded CAN FD (Flexible Data-rate) protocol are being adopted to handle the higher bandwidth demands of advanced driver assistance systems (ADAS), infotainment, and over-the-air updates. However, CAN bus remains deeply embedded in vehicle architecture due to its reliability, low cost, and massive installed base.