Volkswagen Passat: Bad ECM → Symptoms + Diagnosis
Your Volkswagen Passat’s ECM (Engine Control Module) is its brain. Just like a human’s brain, your Passat can’t function without it. It is sometimes referred to as the ECU or PCM. It’s all the same thing. The ECM controls and directs your entire drivetrain (unless there is a serrate transmission controller). When an ECM starts … Read more