2019 Ic Bus Cesb TSBs
179 Technical Service Bulletins across 17 categories
Categories
Engine
57 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.
This article only applies to Models w/ 0016UZL Built Between 06/23/2014 05/11/2020 OR Models w/ 0016UZL w/ Safety...
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Recall 14516 Completed Reference the appropriate Technician Manual for models outside of this population. Safety Recall 14516 has been issued for units built before June 23, 2014. For LT and 2018+ LoneStar: If there is a complaint of the bunk blower turning off after an auto start event, the BCM needs to be updated to Data Version 323 or higher. The bunk blower turning off was only present in BCM Data Version 309 to Data Version 322 To properly diagnose the system, you must ensure the recall has been performed. Only the "Cold Loop" sealed refrigerant core PN # 2614669C1 is to be replaced when the refrigerant circuit fails. DO NOT REPLACE THE COMPLETE UNIT IF THE A/C IS NOT FUNCTIONING. Complete unit is not Warrantable Refer to the BASIC TROUBLESHOOTING below before replacing any components. This will help you identify which component is at fault or any electrical issues. Refer to PARTS INFORMATION to properly identify the parts that may require replacement The A/C portion of the system is listed below in the parts section. The 16UZL No-Idle HVAC system is designed to disengage when the engine is started, and can be turned on with the key in any position. This battery-powered no-idle HVAC system provides heating and cooling of the sleeper area without use of the vehicle engine. The system is comprised of the no-idle HVAC components located in the sleeper HVAC module, a separate fuel-operated coolant heater mounted under the sleeper, and four additional batteries housed in a second battery box. The no-idle HVAC system shares the air handling assembly and several major components with the truck's standard HVAC system. Most importantly, the shared evaporator core contains refrigerant circuits for both the no idle system and the truck's standard A/C system. With this configuration, some procedures required to service the no idle A/C system will require opening the refrigerant circuit of the truck's standard A/C system. Trucks equipped with the 16UZL No-Idle HVAC system have two separate HVAC systems (Standard Truck A/C and the MaxxPower unit); it is important to identify each clearly, so you are troubleshooting the correct system. Per the Operator's Manual page 10: Run the heater at least once a month during the year (for a minimum of 15 minutes).
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.
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.
Inspection of camshaft for PSI 8.8L Propane and Gasoline Engines
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
QLS Emergency Calibration.
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applies to 2016 and newer Cummins B6.6, X15, and L9 engines and all A26 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.
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
Certain school buses may not conform to Federal Motor Vehicle Safety Standard (FMVSS) 217 the exit opening...
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configuration may not meet the minimum exit opening criteria.
Cummins engine vibration with aftermarket air conditioning installed
Bus with Cummins B6.7 engine and Dual A/C - Cylinder Head Failures
Fuel Filters, Winter Additives, and Blending Fuels for Cummins Engines
CPA RCT (relative compression test) for PSI propane or gasoline V8 8.8L engines; School bus models
Reduced ISB Engine Exhaust Brake Efficiency; Only vehicles with Allison 1000/2000 series transmissions
Oil Capacities; All Electronic International Engines 1994 - Present.
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Cummins ISB, ISM & ISX
The required Evaporative Emission label may have been printed with an incorrect engine family and/or model year for the...
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engine installed at time of manufacture. Only models with PSI gasoline or propane engines.
Gasoline Engine Bus Fuel System Issues
Voltage gauge drops on cold engine start-up; Only models built with Cummins ISB, B6.7, ISL, or L9 engines
Gasoline Engine Bus Fuel System Issues
Engine Emission Label Replacement, Certificate of Conformance and Clean Idle Sticker Addition Procedure
Gasoline Engine Bus Fuel System Issues
Aggressive Brakes with Air Brake Foot Valve Leak on Bus; only models with feature code 04WEA - Parking Brake Interlock -...
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With Air Brakes Only
Gasoline Engine Bus Fuel System Issues; only models built with PSI 8.8 Gasoline Engine
Fuel Fired Engine Coolant Heaters
ISB Starting System Diagnostics; Only models built with cummins ISB engines
The brake air line tube from the relay valve port to the left brake modulator valve may be improperly routed resulting...
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in a kinked air line.
Bus Fuel System Issues; only models with PSI 8.8L gasoline engine
Bus Lacking Power Climbing a Hill; only models with PSI 8.8L gasoline engine
Bus coolant hose kink; only models with propane or gasoline engines
Known fueling issues for buses equipped with the PSI 8.8 Gasoline Engine
Cylinder Performance Analyzer (CPA) Resource Center
Engine Oil Capacities All Electronic International Engines 1994 - Present.
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Cummins ISB, ISM & ISX
The Cummins ISB engine may have been assembled with a modified fuel filter mounting bracket resulting in possible...
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improperly routed engine grid heater harness.
Hood Cable replacement; only models with Gas or Propane engines
Certain school buses may not conform to Federal Motor Vehicle Safety Standard (FMVSS) 217 The force necessary to...
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operate the emergency window release latch may exceed the maximum allowable force of 20 lbs.
The roll stability valve air supply line may be incorrectly routed.
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This condition does not affect normal brake operation. However, during a stability control oversteer event and with slippery road conditions, the parking brakes may be modulated unintentionally.
Gasoline Bus - 60gal Fuel Tank Baffles in Incorrect Locations; only models with gasoline engine
Urea Quality Sensor (UQS) Supplemental Diagnostic and Service Information; only models with SCR Aftertreatment system...
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and N9, N10, N13, A26 or Cummins ISB, ISL, ISX engines built from January 2016
Bus with ISB Frequent Regeneration; only models with Cummins ISB engine
Engine Oil Capacities
Engine Oil Capacities
Other
40 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 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
J1939 Data Link Troubleshooting
How to obtain As built parameter list
Driveline Information Center and Troubleshooting Procedures
Cleaning and Disinfecting Trucks and Buses
J1939 Data Link Troubleshooting
Cummins ISB Fan Drive Belt Chirp; Cummins ISB and Cummins B6.7
J1939 Data Link Source Address Information
SCR Vehicles Setting DEF Quality Faults due to Crossed DEF Tank Coolant Lines or Inverted DEFTHV
Certain buses may have been built without a CH545 Key (matched key) Vandal Lock as ordered by the customer.
Diagnosis and repair of intermittent operation of the Child Checkmate reset button.
Geotab with WYE Cable Installation; only models equipped with OnCommand Connection
NEW Ultrasonic DEF Tank Sending Unit; only models with SCR Aftertreatment system.
Cooling System Flush Procedure
J1939 Data Link Source Address Information
Updating OnCommand Link with Accelerator
OnCommand EZ-Tech
Winter Front Usage
Diagnostic Interface Cable Reference Guide
OnCommand EZ-Tech Download Center
EZ-Tech Download Center
Using Vehicle Health Report Faults
How To Get A Helios Capture
SCR Vehicles Setting 3363-16 (FC1713) due to Crossed DEF Tank Coolant Lines or Inverted DEFTHV
Electrical
16 bulletinsTitle: 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
New or replacement body control Module (BC,BCM) not detected; Gen 4 BCM
General wheel speed sensor troubleshooting
Cummins B6.7 Grid Heater Relay
CE Bus Cowl Panel Relay Kit
Applying Advanced Logic Templates; only models equipped with a BCM or ESC
How to Diagnose Electrical Problems with Diamond Logic Builder; only models equipped with a BCM or ESC
How to Get from History and Program a BCM or ESC; only models equipped with a BCM or ESC
A fuel system relay for the propane booster pump and scavenge pump may experience intermittent continuity causing the...
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fuel pump to stop running resulting in unintended stalling condition, no start, or hard start condition.
HVAC fault 2609-19 with 4th Gen BCM; Only models equipped with 4th generation BCM
Battery Testing, Diagnostics, and Maintenance information
Body & Paint
14 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.
Aftertreatment Clamp Corrosion; Single Can Aftertreatment Systems
This document will guide the user through determining if there is a sealing issue with the rear emergency door on a CE...
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Bus.
Bus Body Entry Door Switch, LH Panel Mounted
Body Controller Updates for 500k Baud Data link
Bus Door Adjustment procedure for Electric and Air; only models built 09/15/11 or later
Bus Door Adjustment procedure for Electric and Air
Certain CE Series school bus models may have been built with an incorrect slot location and size for the vandal lock...
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door header.
Hood Cable replacement for Gas and Propane CE Bus only
Bus Door Adjustment procedure for Electric and Air; only Models Built 9/15/11 or later
Bus Entrance Door Adjustment Procedures; only models built prior to 9/15/2011
Bus Passenger Window Troubleshooting; only buses built after 4/17/17
Bus Body Tie Down, Floor Sill Repair
Brakes
11 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.
The ADB22X caliper on the left (driver side) rear corner on school bus applications may experience an unintended...
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reduction in running clearance during operation, which can lead to a dragging brake. The problem occurs intermittently.
This document will guide the user through diagnosing steering wheels not returning to center on IC CE Buses.
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Only models with feature code 0005708 (tilt column P/N 4095815C91 or 4110141C91), with 0004AZS (air brake ABS with ESP) or 0004JNX (hydraulic brakes), with 0047DNK or 0047DNU or 0047DWC (steering wheel switch).
The spring actuated parking brake chamber may have been improperly crimped to the service brake chamber section of the...
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brake chamber assembly resulting in an air leak in the service brake and possible separation of the spring brake chamber.
The spring actuated parking brake chamber may have been improperly crimped to the service brake chamber section of the...
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brake chamber assembly resulting in an air leak in the service brake and possible separation of the spring brake chamber.
The brake pressure switch on these buses may become stuck which results in a false fault code and brake warning light.
The hydraulic brake drop hose to the brake calipers on the steer axle wheel ends may be improperly routed resulting in...
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possible contact with the tire.
IC Bus Service Brake Switch Inspection; only models with Hydraulic Brakes
Hydraulic Brake System Park Brake Inspection and Adjustment Procedures; only models with Hydraulic Brake system equipped...
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with 04GBJ Park Brake
IC Bus Service Brake Switch Inspection
Infotainment
9 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
Radio Diagnostics and Information
NEW Ultrasonic DEF Head Unit; All SCR vehicles
NEW Ultrasonic DEF Head Unit available; Only models equipped with SCR Aftertreatment.
NEW Ultrasonic DEF Head Unit; Only vehicles Equipped with SCR
NEW Ultrasonic DEF Head Unit; only models equipped with SCR Aftertreatment
NEW Ultrasonic DEF Head Unit
Radio Diagnostics and Information
HVAC & Climate
8 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
Factory Installed Air Conditioning, EC4.0 System operating instructions and the service manual
Bus Air Conditioning Service Contacts for HVAC Information
A/C Refrigerant and Oil Capacities
Troubleshooting & Resetting HVAC Doors; only vehicles with Feature Codes 0016WCT and 0016WCS
Lighting
5 bulletinsRepair Procedures for Vehicles Struck by Lightning
Bus Strobe Light Replacements
The wheelchair lift positioning input cam may fail while the lift is in use resulting in a disabled cutoff switch.
Repair Information for Damaged Headlight Connector
Repair Information for Damaged Headlight Connector
Fuel System
3 bulletinsThis 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.
Acceptable Propane Fill Adapter for Refueling
CE Bus fuel sending access hole in wrong location; only models with feature 47AEU built between 5/7/19 and 2/19/20
Pre-Delivery & Maintenance
3 bulletinsTitle: Service Portal iKNow Feedback Case Types Applies To: All
Bus seat back foam inspection guidelines
Post Trip Inspection System Will Not Disarm or Does Not Operate Correctly; excludes Child Reminder System or Child Check...
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Mate.
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
This article is for adding additional protection to the driver's area of the bus to help mitigate the transmission of...
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germs.
Software & Calibration
3 bulletinsQLS Emergency Calibration Revert Process
QLS Emergency Calibration Revert Process
Using Supplier Software to Check DTCs
Hybrid & EV
2 bulletinsTitle: Electric Vehicle Air Dryer Operation
ISB 6.7 Frequent Regeneration
Steering
2 bulletinsCE Bus Steering Returnability Diagnostics.
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Only CE buses built during 1/29/2018 thru 6/11/2019 with Tilt Columns, ESP, and Steering Switch Controls. 2019 and 2020 Model year only
Steering Fluids
Suspension
1 bulletinSuspension Lean Diagnostics; All models
Tires & Wheels
1 bulletinSuggested alignment target values when performing a vehicle axle alignment
Air Bags & Safety
1 bulletinDriver?s seat belt tongue button; Only with Seat Belt Part numbers 4091405c1 thru 4091408c1