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Is it a requirement for semi trucks to have ecm?

Yes, semi-trucks are required to have an ECM (Electronic Control Module). The ECM is a computer system that controls various aspects of the truck, including the engine, transmission, brakes, and other systems. The ECM is necessary for the safe and efficient operation of semi-trucks, as it helps to ensure that all systems are functioning properly and that the truck is operating in a safe manner.
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