Free help & advice Learn more
1 7
Cummins  |  SKU: 3618046

3618046 | Genuine Cummins® Electronic Control Module ECM

$2,57900
Shipping calculated at checkout.
ConditionNew
Express payment options

365-day / 100,000-mile limited warranty on U.S. orders. Return conditions apply. Mandatory legal rights remain unaffected.

365-day / 100,000-mile warrantyU.S. orders · Details › 30-day returnsFrom date received · Details › Free U.S. ground shipping $100+Details › +1 (828) 233-5509Mon–Fri, 8 AM – 8 PM ET

Need a quote?

Need help with fitment or a quote? Include your part number and vehicle details.

Contact our team

An Electronic Control Module (ECM) 3618046 - also called an Engine Control Module or Engine Control Unit (ECU) - is a small computer that manages how an engine operates. It's critical in modern vehicles and equipment, especially diesel engines like Cummins. Related Part Numbers: 3618046RX, 3618046D

General Specifications

Condition New
Part Number 3618046
Brand Cummins
Fits Cummins engine systems N14 M11 L10

Purpose & Function

Function What It Does
Fuel Injection Controls timing and amount of fuel sprayed into the engine.
Air-Fuel Ratio Balances air and fuel for efficient combustion.
Ignition Timing Adjusts spark timing (in gas engines) or injection timing (in diesels).
Turbo Boost Regulates turbocharger pressure.
Idle Speed Maintains smooth idling based on engine load and temperature.
Emissions Systems Manages EGR, DPF, DEF systems to meet emissions laws.
Diagnostics Stores error codes (DTCs) and logs sensor data for troubleshooting.

Signs of a Bad 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.

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.

Bosch Parts

View all