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 ECU is a vital component in modern vehicles that acts as the brain of the car's engine. It controls various functions, such as fuel injection, ignition timing, emissions, and mor...