Diagnosing an Engine Control Module (ECM) problem is one of the most misunderstood skills in the automotive world. 👉 Many mechanics make this mistake: Assume ECM is faulty ❌ Replace it directly ❌ Problem still exists ❌ 👉 Why?Because ECM is rarely the root cause. Golden Rule of ECM Diagnosis 👉 Never blame the ECM … Continue reading How to Diagnose ECM Failure Step-by-Step (Complete Workshop Guide)