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