The Cummins 3654717 is a 12‑V electronic control module (ECM) that manages engine operation, emissions, and diagnostic monitoring for Cummins diesel engines such as the K19, M11, K50, and QSK19 series. Common failure points on this unit include power supply degradation, internal fuse or relay burnout, corrupted firmware, and connector corrosion leading to intermittent communication with the engine control bus. Initial troubleshooting should verify 12‑V input voltage and ground integrity, inspect all wiring harness connectors for signs of wear or damage, and read any stored diagnostic trouble codes via a compatible scan tool before proceeding to module replacement or reprogramming.[oss-gpt-20b]