The engine control module (ECM), also known as the powertrain control module (PCM) or engine control unit (ECU), is a crucial component in modern vehicles that plays a pivotal role in monitoring and controlling the various systems within the vehicle. The ECM is essentially the brain of the vehicle, responsible for managing the engine's performance, emissions, fuel economy, and overall efficiency. It is connected to various sensors throughout the vehicle that provide information on factors suc...

It is responsible for controlling and regulating various functions of the engine, such as fuel injection, ignition timing, emissions control, and more. Without the ECM, the engine would not be able to operate efficiently or at all. The ECM is essentially the brain of the vehicle, monitoring and adjusting various parameters to ensure the engine runs smoothly and efficiently. It constantly receives input from various sensors located throughout the vehicle, such as the oxygen sensor, mass airflo...