Need Help to Start Your Detroit? Check the ECM voltage supply! ⚠️ Is the truck not starting? Don't jump to replacing the ECM just yet! This quick tip shows you how to diagnose a potentially damaged Detroit Engine Control Module (ECM). Symptoms: Engine won't start, the diagnostic scanner can't connect. First, rule out fundamental issues: ✅ Power: Confirm 12v on both power and ignition wires (red = , black = -). ✅ Ground: Verify good ground connection. ✅ Connection: Ensure the communications adapt