your bits are suspended between can high and can low and they vibrate really fast so all the parts of yo'ure car can talk to each other and helpfully stop working when one starts to die and fills the bus with garbgage also all the modules are closed source and encrypted these days with zero documentation ad all u can do is go to a dealer and pay $nonstopassrape for them to swap modules and bles sthem wth dealer tools

u also need 120 ohm cable with 120 ohm terminations on either end or ur signal gets all fucky wucky uWu and glhf with high speed CAN

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