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 … Continue reading How to Diagnose ECM Failure Step-by-Step (Complete Workshop Guide)