2026 International LT TSBs

SRC Turbochargers assembled with new compressor housings may have a defect that prevents the TCOT sensor (Part# 1845988C1, Sensor, Exhaust Gas Temp) from being installed correctly.

International vehicles built after 1/8/2018. International's Electrical Engineering Team made this change to improve the longevity of the OEM coatings and to improve applications at the factory.

Oil leaking from behind the crankshaft gear may exit through the flywheel bolt holes and is often misdiagnosed as a rear crankshaft seal leak. This condition is confirmed by oil-saturated flywheel bolts and visible oil pooling in the flywheel bolt holes behind the gear.

Customer requested changes will be approved in accordance with the requirements specified in 40 CFR Part 1037 to ensure continued compliance with greenhouse gas (GHG) regulations.

and repair an Espar Hydronic S3 Heater (GEN 3). The Espar Hydronic S3 (GEN 3) Auxiliary Heater is a diesel-fired coolant heater for maintaining cabin heat without running the engine. The heater uses fuel from the fuel tank to heat coolant before it goes to the heater core in the sleeper HVAC unit. The heater is located under the cab's sleeper area and is powered by the vehicle's batteries.

Customer requested changes will be approved in accordance with the requirements specified in 40 CFR Part 1037 to ensure continued compliance with greenhouse gas (GHG) regulations.

may experience engine stalling, low performance, and/or poor aftertreatment performance. This is caused by condensation accumulating and freezing within the Charge Air Cooler (CAC); affecting air flow into the engine. This article lists currently available winter front covers that can be installed on the front grille and bumper to reduce cold air flow to the engine compartment.

the vehicle is coming to a stop or sitting at idle.

Accurately identify S13 engine control systems. 2. Understand the programming intricacies related to these systems. 3. Autonomously complete programming tasks without needing technical support.

operator may experience engine stalling, low performance, and or poor aftertreatment performance. This is caused by condensation accumulating and freezing within the Charge Air Cooler (CAC); affecting air flow into the engine. This article lists all the currently available winter front covers that can be installed on the front grille and bumper to reduce cold air flow to the engine compartment.

To: All Navistar Powered Trucks Requesting Engine Emission Label Replacement, Certificate of Conformance and/or Clean Idle Sticker, Clean Truck Check

Clean Idle Sticker, Clean Truck Check

(Metric Prop codes start with the number a 4 and Non metric Prop codes start with a 2.)

driving S13 T14 Powertrain.

NOTE: Calibrations will update to the most recently released calibration. The latest calibration content will include all previously released calibration content. NOTE: International utilizes campaigns and diagnostics to assess the necessity of calibration updates. Warranty claims may be denied if there is no active campaign or if diagnostics do not indicate that a calibration update is required.

S13 Integrated Powertrain.

Output Shaft Sensor) replacement on select, effected vehicles.

This can affect all LT, RH, MV, HV models, 2021MY and up HX, 2024MY and up CE Bus with BCM kernel version 752, 753, and 754. Vehicles built or updated with DLB between 6/1/25 and 11/4/25 are suspected of having these kernels installed on the BCM. The most common complaint is that the steering wheel switches do not function, which, depending on the vehicle model and options, can cause the bus door, pupil warning lights, radio controls, marker interrupt, and cruise control to stop working. Other complaints can include short circuit faults from multiple sensor circuits attached to the BCM setting at the same time, the vehicle will not go into gear, the headlights are stuck on, the brake lights are stuck on, or the parking brake alarm is sounding (horn chirping) with the parking brake set. As of 11/4/25, these symptoms can be resolved by updating the BCM to kernel 755 or later with DLB.

fault codes after a vehicle sits for 2 or 3 days.

fault codes after a vehicle sits for 2 or 3 days.

control module update Sample scenarios Additional information to assist readers in understanding DLB switch pack programming

software to support updated Collision Mitigation, Lane Departure Warning (LDW), and Blind Spot Monitoring systems. If replacing the radios on the vehicles described below, the radio either needs to be built after a specific build date or have the software version verified/updated. If outdated radio software is used on these vehicles, the audible tones for these systems may not be heard by the driver. The applicable vehicles were all built with the correct radio. This iKNnow article only applies if replacing the radio for a service event in one of the vehicles listed below.

It allows users to quickly load files either manually or directly from the Diamond Logic Builder Vehicles folder using VIN-based selection. As files are added or removed, the comparison runs automatically with no manual action required. The program presents results in an interactive table that shows feature codes, descriptions, access levels, and whether each feature is present in each selected file. Built-in search, filtering, and sorting make it easy to locate specific features or focus only on differences between files. Column visibility can be customized to show or hide descriptions and access information as needed. Users can remove files individually or clear all files at once, with results updating instantly. The tool also includes reporting and export options that reflect exactly what is visible on screen, allowing results to be printed, copied, saved as text, or exported to CSV for use in Excel or other spreadsheet tools. Overall, the program streamlines the process of comparing vehicle feature configurations, helping users quickly identify differences, validate setups, and document results without manual comparison or external tools.

windshields using an ultrasonic sound detector.

sensors used by the BCM and PIM module to determine if the operator of the vehicle is applying the service brakes. All S13 vehicles are equipped with BCM feature 597483 (BCM PROG, BRAKE SWITCH, Use With Brake Application Pressure Switch). 597483 uses a normally open brake pressure switch that closes with 2-6 psi of air pressure and a brake application pressure sensor. When the switch is closed or the pressure sensor reads higher than 4psi, the BCM considers the brakes applied and will broadcast that over the J1939 networks to other modules. The S13 also includes a redundant brake switch that is wired directly to the PIM. This switch is normally closed and opens with 2-6 psi of air pressure. If the S13 ECM believes the brakes are applied from one of these brake signals, it can reduce or completely cut throttle input.

inputs from the driver or passenger. In some of these situations, it is possible for this symptom to be present without any fault codes becoming active. This article will guide the user through performing a hard reset of a door pod, which can restore the door pod to its operational condition, thereby avoiding the need for replacement. The steps in this article should be performed BEFORE diagnostics are completed for any active faults.

The information applies to diesel, gas, and electric vehicles.