The CAN protocol, or CAN Bus, is the digital nervous system of a modern vehicle.

Before its introduction, each electronic component required complex, direct wiring.

The CAN Bus simplified this by creating a single network where all 'nodes' (the ECUs) can broadcast and receive messages.

Each message contains an identifier that determines its priority, ensuring that critical information (like a brake command) is processed instantly.

For telematics, the CAN Bus is a goldmine.

By securely connecting to this network, a telematics device can 'listen' to messages and extract extremely accurate data unavailable through other means, such as exact fuel consumption, accelerator pedal pressure, manufacturer-specific engine fault codes, or the status of safety systems.

Access to the CAN protocol is what differentiates basic telematics from advanced and embedded telematics.