Understanding the importance of these components in your vehicle's performance can help you troubleshoot and address any problems effectively. In this comprehensive guide, we will delve into the functions of ECU, PCM, and ECM in a car, discuss common issues that may arise, and provide tips on how to resolve them. The PCM is a more comprehensive control module that oversees the engine, transmission, and other powertrain components. It regulates fuel delivery, spark timing, emissions, and tra...