Electronic Control Module, or ECM, is like the brain of our machine’s engine. We plug sensors into it to read temperature, pressure and speed data. It processes this info and tells fuel injectors and valves how to adjust, keeping things running smoothly and efficiently. Hiccups in the ECM can cause stalling, poor fuel economy or warning lights. We test it with scanners, update its software or replace it if needed. It’s smart tech, but we keep it simple, think of it as the boss telling parts what to do.