2021 International MV TSBs
125 Technical Service Bulletins across 13 categories
Categories
Engine
36 bulletinsThis article provides diagnostic and repair guidance for International MV trucks equipped with D-shaped fuel tanks that...
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exhibit a no-start condition, low power under increased fuel demand, an illuminated check engine light, or Cummins Fault Code 559. The condition may be caused by an excessively long fuel pickup tube contacting the bottom of the fuel tank and restricting fuel flow.
This 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 40F (4C), including high levels of humidity, an operator...
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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.
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.
The copper air compressor discharge line with air dryer feature code 04VLE on Cummins L9 Series engines may crack and leak air due to engine vibration.
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This document will guide the user through the repair strategy to replace the hard copper line with a flexible Teflon version.
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
This document will guide a user to replace and reroute Charge Air Cooler (CAC) for vehicles built with the Cummins ISB...
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and B6.7 engines.
The purpose of this document is to guide a user to resolve fault code 285 & 286 for Cummins engines.
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
Starter kicks out after 1 second on MV and HV with Cummins L9 Engines
Cummins B6.7 and L9 engines with codes 285 and 286
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
QLS Emergency Calibration.
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applies to 2016 and newer Cummins B6.6, X15, and L9 engines and all A26 engines
Bus, DuraStar, and MV air compressor inlet hose chaffing/leaking; equipped with Cummins ISB / B6.7 Engines
Engine viscous fan not disengaging; Only MV series trucks with feature code 12TSY and 6-blade fan
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
DuraStar and MV Air Compressor Inlet Hose Rub.
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Only models equipped with Cummins ISB or B6.7 engines
QLS Emergency Calibration.
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Only models with EPA 2017 and newer Cummins X15, L9, or B6.7 engines
Altec Industries, Inc.
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has received notification from Navistar that a condition exists relating to motor vehicle safety, compliance, or emissions in a vehicle equipped with Altec equipment. Navistar has decided that a non-compliance that relates to motor vehicle safety exists in certain 2021 HV, LT, MV, and RH series trucks built from July 28, 2020, through October 2, 2020, with a Bendix air brake system. Contact your International dealer, a Love's Truck Tire Care, or a Speedco location to schedule a service date to perform the recall. Love's and Speedco locations in Texas are not able to perform warranty services. Altec is not able to complete this repair. This repair is not covered under the Altec Warranty policy.
Certain HV, LT, MV, and RH series trucks do not conform to Federal Motor Vehicle Safety Standard (FMVSS) 121 relating to...
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the secondary air brake system.
MV Air Compressor Inlet Hose Rubbing; only models with Cummins ISB engines and built 11/20/2019 through 11/06/2020
On certain trucks equipped with an automatic transmission, if the automatic transmission is still in drive or reverse...
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position and the stationary PTO switch is engaged, the engine RPM will ramp up and may overcome parking brake hold capability resulting in possible vehicle movement.
Fuel Filters, Winter Additives, and Blending Fuels for Cummins Engines
Certain MV and HV series trucks do not conform to Federal Motor Vehicle Safety Standard (FMVSS) No.
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108 relating to reflective tape missing on back of cab.
Other
26 bulletinsThis document will guide the user through troubleshooting steps to submitting a case file for a horsepower request.
This 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.)
MODELS INVOLVED: International MV Series trucks
Title: Driveline Information Center and Troubleshooting Procedures Applies To: All Vehicles
Title: Fan belt replacement guidelines for frayed edges Applies To: All Models
Switch Pack Programming Troubleshooting Information
This document will provide the user with cleaning options and procedures for aluminum bright work parts that become...
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stained or tarnished.
Cummins ISB Starting system diagnostics.
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
J1939 Data Link Source Address Information
Greenhouse Gas Phase 2 Regulatory Compliance Implementation
J1939 Data Link Troubleshooting
How to obtain As built parameter list
Bendix Stability control - customer satisfaction performance improvement; Specific Emergency / Tanker applications only.
Cab Lean Concern
Driveline Information Center and Troubleshooting Procedures
Dielectric Grease Change
Electrical
21 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 is to inform dealers, customers, and body builders/TEMs of a known BCM software issue with kernels 747 through 752.
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Units built after November of 2024 as well as older units that were updated with DLB between 11/5/2024 and 6/26/2025 with Remote Power Modules (RPM) modules, can experience loss of RPM functionality as well as other electrical system concerns. Kernel 753 was released to DLB on 6/26/2025 to address these concerns.
This document is to inform dealers, customers, and body builders/TEMs of a known BCM software issue with kernels 747 through 752.
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Units built after November of 2024 as well as older units that were updated with DLB between 11/5/2024 and 6/26/2025 with Remote Power Modules (RPM) modules, can experience loss of RPM functionality as well as other electrical system concerns. Kernel 753 was released to DLB on 6/26/2025 to address these concerns.
This document provides: Steps to take when switch pack programming fails, or when switch pack disappears after body...
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control module update Sample scenarios Additional information to assist readers in understanding DLB switch pack programming
Title: Erratic BCM and RPM Behavior with Kernel 747-752 Applies To: All MV, HV, HX with RPM modules
Title: Battery Disconnect Switch Replacement - Best Practices Applies To: All Models with Battery Disconnect Switch
This document details the procedure that must be followed to ensure proper alternator troubleshooting.
This document covers battery diagnostics, maintenance and storage requirement.
Cummins B6.7 Grid Heater Relay
General Wheel Speed Sensor Troubleshooting
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.
Electric Vehicle high voltage battery diagnostics
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
General wheel speed sensor troubleshooting
Cummins B6.7 Grid Heater Relay
Certain International HV and MV Series trucks, and DuraStar and WorkStar model trucks, the battery ground circuit...
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interconnect cable may have been made with RED insulation instead of BLACK.
Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Body & Paint
13 bulletinsIn some instances, the driver's or passenger's door pod may become unresponsive, where it will not respond to any manual...
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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.
This 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.
Chrome Plated C-Loop Mirror Flat Glass Cracks
HVAC & Climate
5 bulletinsTitle: A/C Refrigerant and Oil Capacities Applies To: All current models
Air Compressor Inlet Hose Chaffing / Leaking
MV A/C Condenser Hose Interference With Inner Hood
MV Air Compressor Inlet Hose Rubbing; only MV's with Cummins B6.7 built 11/20/2019 - 11/06/2020
A/C Refrigerant and Oil Capacities
Infotainment
4 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
Bluetooth Cannot Be Connected to Radio
Radio Diagnostics and Information
Lighting
4 bulletinsCertain MV trucks may have an incorrect driveshaft installed in the vehicle that can cause a vibration that may be felt...
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by the driver.
Certain MV Series trucks may have an incorrect driveshaft installed in the vehicle that can cause a vibration that may...
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be felt by the driver.
Lane Departure Warning Alert Active with Turn Signals On; Only models equipped with Lane Departure Warning
Repair Procedures for Vehicles Struck by Lightning
Suspension
3 bulletinsThis article addresses chassis lean conditions on MV with IROS suspension.
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It 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.
This 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.
Front cab mount bushings/insulators MV, HV, DuraStar, and WorkStar vehicles used in severe vocations
Brakes
3 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.
Horizon Cab Door Field Replacement and the Side Window Air Deflectors.
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NOTE: This article will only be applicable to cabs with the deflector mounted on the door pillar. If the cab has the deflector at the windshield, this article does not apply.
Transmission
3 bulletinsThis document is to notify the field of an issue with BCM that causes various electrical system concerns after the vehicle sits for 2-3 days.
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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.
Title: Steering Gear Seal Repair Guidelines Applies To: Steering gears
Power Steering Diagnostics Flow / Pressure Specifications For Power Steering Gears and Power Steering Pumps
Tires & Wheels
3 bulletinsTire Pressure Monitoring system; Feature Codes 16VLS, 16VUY, 16VVA, 16VVM, or 16VUZ
Tire Pressure Monitoring systems (TPMS); Only LT, RH, HV, HX, or MV series trucks with feature code 16VLS, 16VUY,...
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16VVA,16VUZ, or 16VVM
16VLS, 16VUY, 16VVA, and 16VUZ Tire Pressure Monitoring System (TPMS).
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