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Title : Programming Information Associated with International A26B Engines
Applies To : A26B engines

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
04/14/2026 - Initial Article Release

Description
This document enables technicians to:
1. Accurately identify International® A26B engine control systems.
2. Understand the programming requirements and system behavior.
3. Perform programming tasks independently without needing technical support.

Table Of Contents
Timeline

Common Programming Issues With A26B Systems A26B Horsepower Quotes

Software / Hardware Integrations Connecting To An A26B Engine

A26B Engine Swaps And IQA Data

How To Identify An A26B Engine

SDS Programming Special Instructions

Source Addresses

How A26B Engine Modules Work A26B Module Parts Information

Timeline

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Software / Hardware Integrations
International® Service Diagnostic Systems (SDS): Supported. Used for diagnostics and parameter changes.
Navistar Engine Diagnostics (NED): Not supported.
NavKal: Not supported.
DLB: Supported.
360 Write Up: Supported.
The programming station supports this engine type. Use harness 12-801-01-14.
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How To Identify an International A26B engine
See the table below for information about the ESN suffix difference between A26A and A26B engines.
EngineType

ESN Prefix

ESN Start

ESN End

A26A 2017-2021

124KM2Y

4500000

4599999

A26B 2022-

124KM2Y

4600000

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How International A26B Engine Modules Work
Baud Rate: 500k
-IK2700104 500K Connector Compatibility
ECM: Engine Control Module. The ECM holds both the calibration and the parameters. A26B ECMs are dealer programmable. Both the
calibration and parameters can be changed / programmed.
Functional info: The ECM communicates on the J1939 data link. The J1939 data link is used when communicating with SDS.
-IK0800080 J1939 Data Link Troubleshooting
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Connecting to an International A26B Engine
When SDS connects to an A26B engine, the display should resemble the example shown below.
A26B Connected to SDS

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Source Addresses
The ECM broadcasts source address 0 (zero) on the J1939 data link.
IK0800351 provides more information on source addresses.
The source address can be seen in the sniffer in either NED or NavKal.
If using a NEXIQ Communication cable, you could check the NEXIQ Device Tester to see if source address 0 shows on the J1939 data
link.
IK2600293 provides more information about the NEXIQ Device Tester.
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International A26B Engine Module Parts Information
If you need engine identification information, please see IK2600242.
For more pictures of these modules, see IK2600273.
A26B ECM

Programming Station Connected

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International A26B Horsepower Quotes
Horsepower increases are supported for A26B engines. Follow the process outlined in IK2600069 to submit a case file for a horsepower
quote.
Horsepower quotes are only supported for International® dealerships. Horsepower quote information can only be provided via a case file.
Below is some general ratings information.
2021A26B engines in line haul trucks can only be rated at 475 hp. There are no other ratings options.
2021 A26B engines in vocational trucks have a range of 370 hp to 475 hp, depending on the truck model.
2022+ A26B engine in line haul trucks can be rated at either 475 hp or 515 hp. Those are the only ratings available.
2022+ A26B engines in vocational trucks have a range of 370 hp to 515 hp, depending on the truck model.
Although the engine may support a range of horsepower ratings, this does not mean the vehicle qualifies for the highest available rating.
International only supports horsepower ratings that were available for any given vehicle / engine combination at the time the vehicle was
built.
If the engine you’re considering already has the highest possible rating, then no increases are available. There is no need to submit a case
file requesting a horsepower quote if the engine is already at the highest supported rating, as such a request will be denied. The
screenshot below shows the highest ratings available for A26B engines in both vocational and line haul trucks.
Application

Rating Code

Horsepower

Torque

2021 Line Haul

12BGH

475

1,700

2021 Vocational

12BEY

475

1,700

2022+ Line Haul

12BGJ

515

1,850

2022+ Vocational

12BEZ

515

1,850

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International A26B Engine Swaps and IQA Data
There are three A26B engine types technicians should be aware of.
Engine Type
Production
Engine

ESN Structure

IQA Data

124KM2Yxxxxxxx

Production engines were originally built to be installed in a
specific VIN at an assembly plant. As-built IQA data is stored by
International. However, International does not have IQA data for
injectors that were changed after the truck was built.

Service Engine

124KM2Yxxxxxxx

Service engines were not built for a specific VIN. They were built
to remain available until they are needed to replace another
engine. As-built IQA data is stored by International.
However, International does not have IQA data for injectors that
were changed after the truck was built.

Remanufactured
Engine

ESN typically
begins with "S".

Remanufactured engines were remanufactured by another
business besides International and therefore were not given an
ESN that follows the structure of International ESNs. International
does not have any record of the IQA values.

See IK2600047 for information about engine swaps in general. Programming changes may be needed in order to accommodate an engine
swap. There are some instances where International CANNOT support an engine swap. If you have any doubts about whether your engine
swap will be supported by International, please start a case file with the Vehicle Programming group BEFORE swapping engines and we
will let you know if International® will support the swap. The potential negative outcome would be that you install an engine that
International cannot support – then we would not be able to provide you with any programming changes to support the new engine.
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SDS Programming Special Instructions
1. SDS is the only software for programming A26B ECMs.
2. You DO NOT need to remove fuses to program an A26B ECM with SDS.
Explanation: Before SDS begins programming, it sends out a data link message instructing all other modules to stop communicating.
A26A powered vehicles were the first vehicles produced by International that had all modules compliant with this data link message.
For all vehicles built prior to 2017 A26A engines (N Series, MaxxForce...), International recommends removing the ABS fuse and
transmission fuse before programming.
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Common Programming Issues with A26B Systems
1. Cluster Message: "Regen Failed: Contact Service Center"
Issue: This is a message sent by the ECM to the cluster to warn the driver that there is an issue with the regen process but it is not to
the point of setting a fault code.
-Fix: Diagnostics can be found in the engine diagnostic manual: Symptom Diagnostics > Aftertreatment System > Diesel
Particulate Filter (DPF) Regeneration Fails
2. Total Miles in odometer (in instrument cluster) changes during programming.
Issues:
a. Odometer miles is reduced by EXACTLY fifty percent (cut in half)
-Fix: Remote support will be needed. Start a case file with the Vehicle Programming group as the body controller kernel will
need to be rolled back. See IK3000111 for instructions on how to start a case file.
b. Odometer miles increase
-Fixes:
1. Use DLB Set Odometer function to set the odometer to the current ECM value for total vehicle distance. This option
can be found in DLB > Tools > Set Odometer. The DLB Set Odometer function forces the cluster to acquire the total
vehicle distance from the engine ECM. If the ECM total vehicle distance is set to an incorrect value, that will need to be
fixed before using the DLB Set Odometer option.

2. If setting the odometer through DLB does not fix the issue, then remote support will be needed. You will need to start
a case file with the Vehicle Programming Group. See IK3000111 for instructions on how to start a case file.
3. SDS Update Manager screen appears blank. This can be caused by having insufficient user permissions for the SDS software.

-Fixes:

1. Contact your dealer administrator to see if you have the standard dealer level permissions
2. Submit a case file to the EZ-Tech Support Team. See IK3000111 for instructions.
4. SDS Cannot clear Oil Change Fault 1378-31
-Fix: Change these parameters: A814 000 "Fuel Used Service Interval", A814 001 "Engine Hours Service Interval", and A814 002
"Vehicle Distance Servcie Interval" to "0" (zero).
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OTHER RESOURCES
Master Service Information Site
RC2600001 - Vehicle Programming Resource Center

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