4387013 | Genuine Cummins® Ignition Control Module

Controls Spark Timing
It determines when each spark plug fires, based on input from sensors (like the crankshaft and camshaft position sensors).

Activates the Ignition Coil(s)
It tells the ignition coil(s) when to send high voltage to the spark plugs, creating the spark that ignites the fuel-air mixture.

Ensures Efficient Combustion
Proper ignition timing leads to optimal engine power, smooth operation, lower emissions, and better fuel economy.

Coordinates with the Engine Control Module (ECM)
In modern engines, the ICM works closely with or as part of the ECM to adapt timing to various conditions like engine load, speed, and temperature.

Random or frequent misfires
Especially noticeable under load or during acceleration
Caused by incorrect spark timing or no spark delivery

2. Engine Won’t Start (No Spark)

Cranks, but doesn’t start
Fuel may still flow, but there's no spark to ignite it
Complete failure of the ICM = no ignition coil activation

3. Stalling or Sudden Shutoff

Engine may run fine for a while and then suddenly shut off
Often happens after the engine warms up
Can restart after cooling down — classic thermal failure sign

4. Heat-Related Failure

Starts and runs cold, but stalls when hot
Heat can cause expansion or internal breakdown in the module
May resume function once cooled

5. Check Engine Light (CEL)

Onboard diagnostics detect ignition or misfire issues
Common codes:
P0300–P0306 (misfire detected)
P0351–P0362 (ignition coil control circuit fault)
Custom fault codes in heavy-duty engines like Cummins ISX12G

6. Poor Acceleration or Engine Hesitation

Engine hesitates or bogs down during throttle input
Spark isn’t timed correctly or is too weak to ignite mixture

7. Backfiring

Spark firing at the wrong time causes fuel to ignite in exhaust
Loud popping noise from exhaust or intake

8. Low or No Spark Output

Weak or no signal to the ignition coil
Can be tested with a spark tester or diagnostic scan tool