What is PCM? The Powertrain Control Module (PCM) is an advanced version of the ECU that not only controls the engine but also oversees the transmission, drivetrain, and other related systems. This integrated approach allows for better coordination and overall vehicle performance. Understanding these critical components is key to diagnosing and resolving any problems with your vehicle. In this comprehensive guide, we will walk you through everything you need to know about ECUs, PCMs, and ECMs...