2021 Ic Bus Cesb TSBs
73 Technical Service Bulletins across 12 categories
Categories
Engine
25 bulletinsThe purpose of this article is to provide updated repair guidelines for the engine oil pan leak on all 8.8L gasoline and LPG engines.
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Engine oil can leak from the rear of the engine oil pan due to an excessive gap in the sealing area between the engine oil pan and the engine block.
The purpose of this article is to provide updated repair guidelines for the engine oil pan leak on all 8.8L gasoline and LPG engines.
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Engine oil can leak from the rear of the engine oil pan due to an excessive gap in the sealing area between the engine oil pan and the engine block.
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.
This document will guide users through supplemental oil consumption diagnostics for 8.8L PSI gas and propane engines.
The purpose of this article is to provide updated guidance regarding PSI 8.8L repair versus engine replacement.
Title: How to Request a Horsepower Quote Applies To: All International and Cummins Electronic engines
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.
This document will guide the user through the exhaust manifold inspection process and cover the change in the exhaust...
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manifold installation procedure to prevent damage due to thermal expansion.
The purpose of this article is to provide updated repair guidelines for the engine oil pan leak on all 8.8L gasoline and...
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LPG.
How to request a horsepower quote; all International and Cummins engines
CE Bus Engine Cover Sealing
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
In cold weather, especially during engine warmup, the engine may experience a misfire condition resulting in setting the...
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Malfunction Indicator Lamp (MIL) and possible increase in emissions. Only models with Generation II PSI 8.8L LP engines.
Bus, DuraStar, and MV air compressor inlet hose chaffing/leaking; equipped with Cummins ISB / B6.7 Engines
With the vehicle in motion, the engine control module (ECM) may set a fault code resulting in engine shut down without warning.
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Only models equipped with certain PSI engines
QLS Emergency Calibration; Models equipped with 2016 and newer Cummins B6.7, X15 and L9 engines or International A26...
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engine.
With the vehicle in motion, the engine control module (ECM) may set a fault code resulting in engine shut down without...
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warning; Only models built with PSI gasoline or LPG engines
Other
20 bulletinsIC Bus Operator's Manuals
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.)
Title: Driveline Vibration w/SPL170 Applies To: 2021 - 2025 International IC Bus Electric CE Series
Title: Driveline Information Center and Troubleshooting Procedures Applies To: All Vehicles
Title: Fan belt replacement guidelines for frayed edges Applies To: All Models
Title: 6090/6091 Connector Damage Applies To: IC Bus Electric CE Series, International eMV Series
J1939 Data Link Source Address Information
Diagnosis of chassis wander complaints.
Luggage rack upholstery repair; only busses equipped with luggage rack.
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
Electrical
8 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.
Title: Next Gen CE Bus Starter Interlock Dash Chime Applies To: Next Gen CE Bus with starter interlock feature built...
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prior to 2/19/25
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
PicoScope Test - Battery Loss of Charge - Parasitic Draw Test
HVAC & Climate
4 bulletinsTitle: A/C Refrigerant and Oil Capacities Applies To: All current models
Title: Servicing Air Conditioning Systems on Electric Vehicles
Title: Factory Installed Air Conditioning, EC4.0 System BE, CE, FE, RE Bus Models
Air Compressor Inlet Hose Chaffing / Leaking
Fuel System
3 bulletinsThis document is for Diesel buses MY2020, MY2021, MY2022, MY2023, and MY2024 specifically built between 11/30/20 and...
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5/18/23 that are experiencing fuel leaks at the fuel tank cap for not being seated fully, and for MY2024 and MY2025 buses built between 1/2/24 and 9/19/25 for fuel necks being loose.
This article will guide the reader through steps to help gain a general understanding of the LPG Gen 1 and Gen 2 fuel...
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supply systems, as well as proper fuel system checks to obtain boost pressure.
Bus Diesel fuel Cap Leaks; only models built 11/30/2020 through 05/18/2023
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.
Title: Radio Clock is Freezing Applies To: Next Gen CE Bus
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.
Body & Paint
2 bulletinsThis document will guide the user through repairing a Next Gen CE Bus Driver's Window with loose, displaced, or falling-out upper or lower seals.
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See symptoms below for an example of the issue.
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.
Pre-Delivery & Maintenance
2 bulletinsTitle: Service Portal iKNow Feedback Case Types Applies To: All
Bus seat back foam inspection guidelines
Transmission
2 bulletinsTitle: Steering Gear Seal Repair Guidelines Applies To: Steering gears
Power Steering Diagnostics Flow / Pressure Specifications For Power Steering Gears and Power Steering Pumps
Software & Calibration
2 bulletinsQLS Emergency Calibration Revert Process
QLS Emergency Calibration Revert Process
Hybrid & EV
1 bulletinTitle: Electric Vehicle Air Dryer Operation