The ECU is responsible for managing the engine's performance, emissions, and fuel efficiency. It gathers data from various sensors located throughout the vehicle and adjusts settings to optimize performance under different driving conditions. ECUs, PCMs, and ECMs rely on sensors that monitor various parameters such as engine temperature, air intake, throttle position, and more. Based on the data collected from these sensors, the control modules adjust fuel delivery, ignition timing, and other...

What is an ECU, PCM, and ECM? Electronic Control Unit (ECU) is a generic term describing any embedded system that controls one or more of a vehicle's electronic systems. The Powertrain Control Module (PCM) is a type of ECU that manages the engine and transmission functions, while the Engine Control Module (ECM) specifically oversees the engine's operation. Faulty wiring or connectors Corrosion or water damage ...