3084473 | Genuine Cummins® Electronic Control Module ECM

1. Engine Won’t Start or Cranks But Won’t Fire

The ECM controls fuel injection and timing. If it fails, the engine may crank but not inject fuel.
No communication with ECM = no engine start.

2. Check Engine Light (CEL) Stays On

A faulty ECM may trigger a constant CEL, or you may get strange or multiple fault codes (DTCs).
Sometimes, you can’t clear codes even after fixing other components.

3. Unusual or Erratic Engine Behavior

Engine misfires
Surging or stalling
Rough idling
RPMs fluctuating with no throttle input

4. Loss of Power or Poor Fuel Economy

The ECM may not control the air/fuel ratio correctly, resulting in sluggish performance or high fuel usage.
Turbo boost or timing may not respond properly.

5. Injector or Turbo Problems (False or Real)

ECM might not signal injectors or turbo actuator correctly.
You might see dead injector codes (e.g., SPN 132 FMI 31), even when the injector is fine.

6. No Communication With Diagnostic Tools

Plug in a scan tool and get “No ECM Detected”.
This could also be caused by wiring or power issues, but a totally dead ECM is a likely cause.

7. ECM Not Receiving Power or Ground

This could be from:
Blown ECM fuse
Corroded connectors
Failed internal ECM circuits
Important: If power/ground are good but ECM won’t respond = likely internal failure.

8. Repeated or Unresolvable Electrical Faults

You fix wiring or sensors, but the problem keeps coming back.
Example: You replace the camshaft sensor, but the fault returns — could be the ECM misreading it.

9. Overheating or Water Damage Signs

ECMs exposed to vibration, heat, or water can crack internally or corrode.
If engine overheated or water entered the ECM housing — expect failure soon.