Audi A4: Bad ECM → Symptoms + Diagnosis
Your Audi A4’s ECM (Engine Control Module) is its brain. Just like a human’s brain, your A4 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