2021 International Lonestar TSBs
97 Technical Service Bulletins across 15 categories
Categories
Engine
26 bulletinsThis document will guide the user through the changes of the dielectric grease/coatings used in certain areas on all...
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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.
This document provides guidance for assessing the feasibility of implementing a customer-requested change to an engine or vehicle parameter/feature.
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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.
This document provides guidance for assessing the feasibility of implementing a customer-requested change to an engine or vehicle parameter/feature.
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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.
New CARB Idle Reduction Change Request
Engine replacements for all International engines will need to follow this procedure.
In some geographic areas, ambient temperatures reaching below 15F (-10 C), including high levels of humidity, an...
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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.
Title: Engine Emission Label Replacement, Certificate of Conformance and Clean Idle Sticker Addition Procedure Applies...
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To: All Navistar Powered Trucks Requesting Engine Emission Label Replacement, Certificate of Conformance and/or Clean Idle Sticker, Clean Truck Check
Title: How to Request a Horsepower Quote Applies To: All International and Cummins Electronic engines
Applies To: All Navistar Powered Trucks Requesting Engine Emission Label Replacement, Certificate of Conformance and/or...
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Clean Idle Sticker, Clean Truck Check
Starter Diagnostics and warranty claim procedure; all engines EXCLUDING Cummins ISB engine with Allison transmission or...
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PSI engine.
How to request a horsepower quote; all International and Cummins engines
Per agreement with EPA and CARB, Cummins, Inc.
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provided an emergency calibration for Cummins ISB, B6.7, ISL9, L9, and X15 engines when a DEF Quality Sensor (DQS) was not available. This action addressed the Diesel Exhaust Fluid (DEF) Quality Sensor failures in the field and the unavailability of parts due to the worldwide chip shortage. This recall is step two of this program designed to revert all affected vehicles back to the certified calibration and to provide them with the latest improved DQS and Coolant Control Valve (CCV) designs. Additionally, the emergency calibration and the restoration to the certified calibration with the latest improved DQS and Coolant Control Valve (CCV) designs have no effect on vehicle Emissions.
Cummins Programming guide and fault codes285 & 265; only vehicles built with Cummins B6.7, X15, or L9 engines
Starter diagnostics and warranty claim procedure for all engines and all chassis EXCLUDING vehicles equipped with PSI...
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engines or Cummins ISB engine with Allison transmissions
QLS Emergency ECM Calibration; only models equipped with Cummins B6.7, X15, L9, or International A26 engines
During high electrical demand, the cables that ground the batteries to the vehicle frame can carry the full system...
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current and may result in excessively hot battery ground cables and in some cases, battery post separation. Only trucks equipped with Cummins engines, feature codes 0008GXK, 0008GHJ and 0008GWY (high output alternators 275 to 375 amp output), and feature codes 0016UZL and 0016VLN (no idle HVAC), or 008XDM and 008XLD (DC to AC power inverter).
QLS Emergency Calibration; Models equipped with 2016 and newer Cummins B6.7, X15 and L9 engines or International A26...
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engine.
QLS Emergency Calibration; Models with 2016 Cummins ISX, A26 and EPA 2017 and newer Cummins X15, L9, or B6.7 engines
Engine Oil Capacities.
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All International electronic engines 1994 to present and Cummins ISB, ISM, or ISX engines
QLS Emergency Calibration.
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Only models with EPA 2017 and newer Cummins X15, L9, or B6.7 engines
Snap-On torque wrench requirement for all big bore engine connecting rod bolt(s).
The battery ground cable may break at the frame connection resulting in loss of electrical power and unintended engine...
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shut down without warning.
The battery ground cable may break at the frame connection resulting in loss of electrical power and unintended engine shut down without warning.
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Unintended engine shut down without warning may result in a vehicle being stalled on the side of the roadway which could increase the risk of a vehicle crash.
The air filter elements may debond resulting in dirt entering the engine intake.
Fuel Filters, Winter Additives, and Blending Fuels for Cummins Engines
Eaton AMT Calibration Update with 2020 Cummins X15 Engines; only trucks built 02 January 2020 through 02 April 2020.
Other
23 bulletinsThis document will guide the user through understanding Prop Shaft Codes and understanding the variations of prop codes.
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(Metric Prop codes start with the number a 4 and Non metric Prop codes start with a 2.)
Title: Driveline Information Center and Troubleshooting Procedures Applies To: All Vehicles
Title: Fan belt replacement guidelines for frayed edges Applies To: All Models
Certain LoneStar may have an intake air filter that does meet quality standards.
J1939 Data Link Source Address Information
Diagnosis of chassis wander complaints.
J1939 Data Link Source Address Information
J1939 Data Link Troubleshooting
Telematics installation guidelines - Only units with 500K data link
J1939 Data link source address information
Pico Scope CCOS (Crankcase Separator Test)
PicoScope Test One Channel RCT
PicoScope Test Resistance and Ohmmeter
PicoScope Test for Datalink (CAN) Health Shorts & opens
Side mounted cab extender fins that provide more flexibility during trailer contact.
J1939 Data Link Source Address Information
Greenhouse Gas Phase 2 Regulatory Compliance Implementation
J1939 Data Link Troubleshooting
How to obtain As built parameter list
The deaeration tank may leak coolant.
Cab Lean Concern
Driveline Information Center and Troubleshooting Procedures
Dielectric Grease Change
Electrical
15 bulletinsCertain International trucks and IC BusTM CE Series buses may have out of date BCM programing that may cause erroneous...
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fault codes after a vehicle sits for 2 or 3 days.
Certain International trucks and IC BusTM CE Series buses may have out of date BCM programing that may cause erroneous...
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fault codes after a vehicle sits for 2 or 3 days.
This document details the procedure that must be followed to ensure proper alternator troubleshooting.
This document covers battery diagnostics, maintenance and storage requirement.
General Wheel Speed Sensor Troubleshooting
Fifth Wheel Unlock - Trailer Lamp Detection Calibration.
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Only models equipped with BCM feature code 597017
N2 telematics module not communicating with OCC systems.
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Only models built with feature codes 10ADT, 10AEY, 10AEU, 10AEZ, 10AGB, or 10AGC built from 04/04/2019 through 11/01/2022.
PicoScope Wheel Speed Sensor Test
PicoScope Test - Battery Loss of Charge - Parasitic Draw Test
PicoScope Test 5V & 12V Intermittent Open and Short circuit diagnostics
New or replacement body control Module (BC,BCM) not detected; Gen 4 BCM
The ESPAR heater may not function properly because of a constant voltage supply from the BCM to the ESPAR control module.
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2020 Model year HX, LT and Lonestar
General wheel speed sensor troubleshooting
The telematics module may not call home, resulting in an inability to perform over-the-air programming.
Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Body & Paint
11 bulletinsThis article addresses chassis lean conditions on all chassis.
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This does not include any diagnostics for body leans such as a cab lean. Keep in mind that a chassis lean may cause or accentuate a cab lean. Filling out the printable form and using the notes in blue will help you to determine the source of the lean and identify the action and parts required to correct the lean.
Cab water leak trouble shooting tips
Water leaks past plastic vapor barrier sheet in the inner cavity of the cab entry door
Cab water leak troubleshooting tips; HX with steel cab only
Cab water leak troubleshooting tips
Aftertreatment Clamp Corrosion; Single Can Aftertreatment Systems
Day cab roof air deflector causing loud vibration noise at highway speed
Programming Procedure for Center Panel Switch Packs
Programming Procedure for Center Panel Switch Packs
Programming Procedure for Center Panel Switch Packs
Programming procedures for the center panel switch packs has changed.
HVAC & Climate
4 bulletinsTitle: A/C Refrigerant and Oil Capacities Applies To: All current models
Potential A/C Compressor Parts shortage - 4158126C1 (A/C compressor)
Potential A/C Compressor Parts Shortage
A/C Refrigerant and Oil Capacities
Transmission
3 bulletinsTitle: Steering Gear Seal Repair Guidelines Applies To: Steering gears
Power Steering Diagnostics Flow / Pressure Specifications For Power Steering Gears and Power Steering Pumps
Certain vehicles with a manual transmission may need the BCM to be updated for the over-the-air (OTA) programming to...
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function.
Tires & Wheels
3 bulletinsSuggested alignment target values when performing a vehicle axle alignment.
Tire Pressure Monitoring system; Feature Codes 16VLS, 16VUY, 16VVA, 16VVM, or 16VUZ
Cab Components That Reduce Wheel End Vibration Complaints.
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NOTE: Lonestar Day Cab Only
Infotainment
2 bulletinsThis tool is designed to compare Diamond Logic feature data across multiple vehicle configuration files.
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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.
Radio clock changes time automatically; Only vehicles built after March 2020 and excluding CV
Brakes
2 bulletinsThis document will guide the user through a step-by-step procedure for detecting water leaks in vehicle cabs and...
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windshields using an ultrasonic sound detector.
This document is to guide users to eliminate brake pedal rattle noise.
Pre-Delivery & Maintenance
2 bulletinsTitle: Service Portal iKNow Feedback Case Types Applies To: All
Frame Rail Straightness Inspection Procedure
Software & Calibration
2 bulletinsQLS Emergency Calibration Revert Process
QLS Emergency Calibration Revert Process
Suspension
1 bulletinThis document reminds technicians of the critical relationship between the truck's suspension and the driveline operating angles.
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The information applies to diesel, gas, and electric vehicles.
Fuel System
1 bulletinCertain International LT, HV and RH Series trucks may have the incorrect EGRV mounting bolts installed.
Steering
1 bulletinSteering Shake, Shimmy, Shudder, Wobble, Steering Vibration; only models built with 14K weight rated axles or lower
Lighting
1 bulletinRepair Procedures for Vehicles Struck by Lightning