4 ms·What part of starting a car is fast compared to the canbus? Speed is relativeby EasyMark 3y agoWhat part of starting a car is fast compared to the canbus? Speed is relativeddalex 3y agoThere are usually two can buses a car, a slow one and a fast one. The slow one controls the lights, infotaiment, climate, etc, while the fast one controls the ECU, driver assist, all related to driving.aosmith 3y agoIf you have access to one you generally have access to both.