5320557 | Genuine Cummins® Ignition Control Module

An Ignition Control Module (ICM) 5320557 is an electronic component in an engine's ignition system that controls the timing and firing of the spark plugs. It plays a crucial role in ensuring the engine runs smoothly and efficiently by managing when and how the ignition coil sends voltage to the spark plugs.

General Specifications

Fitment

Fitment can vary by engine build and options. Match the part number on the part you are replacing, or contact us with your vehicle details before ordering.

Purpose & Function

• 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.

Signs of a Bad Ignition Control Module

1. Engine Misfires

• 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

About Cummins

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.