Your Lexus IS 300’s ECM (Motor Regulate Module) is its Intellect. Comparable to a human’s Intellect, your IS three hundred can’t carry out without the need of owning it. It is usually often called the ECU or PCM. It’s all exactly a similar depth. The ECM controls and directs your whole drivetrain (Unless obviously There exists a serrate transmission controller). When an ECM starts to go lousy, it can lead to several concerns.