Important Information – Used ECMs

• Tested & Verified: Good, tested used electrical components.

• Programming Required: Must be flashed to your vehicle’s specific VIN by a dealer or qualified diesel shop before installation.

• Programming Not Included: Buyer is responsible for all programming.

• Return Policy: Electrical components that have been opened, installed, or plugged in are generally non-returnable unless covered under warranty.

2593623C1 Used International/Navistar Engine Control Module (ECM) – T444E / DT466E / DT530E

This used International/Navistar 2593623C1 Engine Control Module (ECM) is associated with compatible International T444E, DT466E, and select DT530E diesel engine applications commonly found in school buses, medium-duty commercial trucks, and other fleet vehicles.

Also associated with OEM part numbers 1833558C1 through 1833558C8, this engine computer is part of the earlier-generation International/Navistar electronic engine management systems used in select EPA 1998–2003 applications.

The ECM serves as the electronic control center for the engine, managing essential functions such as fuel injection timing, electronic fuel delivery commands, sensor inputs, engine diagnostics, and operating parameters.

These modules are especially relevant to fleets maintaining older International school buses and commercial trucks. As vehicles age, finding replacement electronic components can become increasingly difficult, making tested used ECMs a valuable alternative to purchasing new or remanufactured components.

A tested used International ECM provides a cost-effective replacement option for a failed or malfunctioning engine computer, helping transportation departments, diesel repair facilities, and fleet operators reduce repair expenses while extending the service life of existing vehicles.

This module requires VIN-specific programming before installation. Programming must be performed by a dealer or qualified diesel repair facility equipped to work with International/Navistar electronic engine control systems.

Important Compatibility Note: International used multiple ECM hardware versions and calibrations across the T444E, DT466E, and DT530E engine families. Matching the engine model or emissions year alone does not guarantee compatibility. Verify the original ECM part number, vehicle VIN, engine serial number, horsepower rating, and calibration requirements before purchasing.

Part Specifications

Primary OEM Part Number: 2593623C1
Stock Number: 10E-1833558-STK
Manufacturer: International / Navistar
Component Type: Engine Control Module (ECM)
Condition: Used – Tested
Additional OEM Numbers: 1833558C1, 1833558C2, 1833558C3, 1833558C4, 1833558C5, 1833558C6, 1833558C7, 1833558C8
Engine Manufacturer: International / Navistar
Primary Engine Applications: T444E / DT466E
Additional Engine Application: Select DT530E Configurations
Engine Type: Electronically Controlled Diesel
Emissions Generation: Select EPA 1998–2003 Applications
Fuel Injection System: HEUI (Hydraulically Actuated Electronically Controlled Unit Injection)
Programming Required: Yes – VIN/Engine-Specific
Programming Included: No
Typical Vehicle Applications: School Buses, Medium-Duty Trucks, and Commercial Chassis

Common Applications

The International 2593623C1 ECM is associated with select vehicles equipped with compatible T444E, DT466E, or DT530E diesel engines.

School Bus Applications

• International 3800 Conventional School Bus – Select T444E and DT466E Applications

• International 3000 Series School Bus Chassis – Compatible Engine Configurations

• International / AmTran Conventional School Buses

• AmTran Genesis / Front-Engine Transit School Buses – Select Applications

• Early IC Bus Models Equipped with Compatible International Diesel Engines

Medium-Duty Commercial Truck Applications

• International 4700 – Select T444E and DT466E Applications

• International 4900 – Select DT466E Applications

• International 4800 – Select Compatible Diesel Engine Configurations

• International 4300 – Select Early DT466E Applications, Subject to ECM Verification

• Other International/Navistar Medium-Duty Vehicles Equipped with Compatible Pre-EGR Diesel Engines

These are potential vehicle applications associated with the engine families and ECM references, not guaranteed direct fitments for every model year.

Important Compatibility Note: The EPA 1998–2003 designation does not mean this ECM will fit every International diesel engine from those years. Later EGR-equipped engines and different ECM generations may require completely different electronic control modules.