ECM (Engine Control Module) The ECM, or Engine Control Module, is another term used to refer to the ECU in some vehicles. It performs similar functions to the ECU, controlling engine operation and ensuring efficient performance. In conclusion, understanding the role of your car's Engine Control Unit (ECU), PCM, or ECM is essential for maintaining optimal performance and efficiency. By knowing how these components work and identifying common problems, you can take proactive steps to keep you...