ECU is an acronym for the engine control unit, which is the primary computer that controls the engine's performance in a vehicle. Some synonyms for ECU include electronic control module, powertrain control module, engine management system, and engine control module. The engine control module regulates various systems such as fuel injection, ignition timing, and emission controls. It helps the engine to run cleaner, more efficiently, and with improved fuel economy. The electronic control module is an essential part of modern-day vehicles, and it helps to ensure that the engine runs smoothly and optimally. With the right ECU in place, the car can deliver a better driving experience and keep maintenance costs at a minimum.