Complaints over time
Complaints about the 2021 IC BUS Cesb peaked in 2025, with 2 filed
Owner complaints about this model year, by the year they were filed with NHTSA.
Source: NHTSA ODI complaints file. The lighter column runs through October.
Model yearPark outside
2021 IC BUS Cesb
Bus, gasoline, built in United States. Owner complaints on file from Apr 7, 2025 to Jun 10, 2026.
Recall campaigns covering this model year440k vehicles or units across those campaigns
Owner complaints3Not enough peers on file
Severity index0.02021 buss average 0.0
First 24 months0Complaints in its first two years
Components
67% of complaints about the 2021 IC BUS Cesb name engine and cooling
Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls
4 recall campaigns cover the 2021 IC BUS Cesb
Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.
| Campaign | Filed | Subject | Component | Vehicles | Remedy |
|---|---|---|---|---|---|
| 25V-580 | Sep 4, 2025 | Underfloor reinforcement may not have been installed, compromising the structural integrity of the buses | Structure | 457 | Repair or modification |
| 25V-503 | Aug 6, 2025 | Brake pressure switch assembly may leak brake fluid into the brake pressure switch's electrical components and cause an electrical short-circuitPark outside | Brakes | 16,553 | Repair or modification |
| 23V-398 | Jun 2, 2023 | Brake pressure switch assembly may leak brake fluid into the brake pressure switch's electrical components and cause an electrical short-circuitPark outside | Brakes | 15,398 | Part replacement |
| 21V-837 | Oct 25, 2021 | Engine control module (ECM) may set a fault code that results in an unexpected engine shut down | Engine and cooling | 7,322 | Software update |
Source: NHTSA ODI recalls file.
Owner complaints
What owners reported about the 2021 IC BUS Cesb
The full text of every complaint filed with NHTSA about this model year, newest first. Complaints are filed by owners and are not verified by NHTSA; NHTSA removes personal details before publishing.
3 complaints on file, page 1 of 1.
- Filed Jun 10, 2026Failure Jun 5, 2026Walden NY, NYUnknown or other
Exhaust leaks caused by calapsed exhaust manifold pipes on 34 IC units with PSI engines. they are wrapped with aluminium covering with insulation. This in turn makes high heat tempuraters that split and burn up and disfigure pipes. Which can cause a fire if any oil leakage or fuel occurs. It also has been snapping exhaust manifold bolts away from manifdolds.
NHTSA complaint 11743266 - Filed Oct 23, 2025Failure Oct 23, 2025Cottage Grove, MNEngine
THis is a school bus- Exhaust downpipes leading into the catalytic converters melted down and created large holes in the exhaust pipe itself. Extreme heat developed by engine.
NHTSA complaint 11695245 - Filed Apr 7, 2025Failure Mar 27, 2025Cottage Grove, MNEngine, Fuel/propulsion system
School buses. We have a fleet of these and the condition is happening repeatedly and to almost every bus with this PSI brand 8.8L gasoline engine. The engine exhaust downpipes melt from excessive heat and/or fuel. The pipes then crack and produce an exhaust leak near the body firewall. Potential for exhaust and flame to escape from the pipe.
NHTSA complaint 11653212
Source: NHTSA ODI complaints file.
Investigations
NHTSA has not opened an investigation on this model year
Source: NHTSA ODI investigations file.
Service bulletins
73 manufacturer communications cover this model year
Technical service bulletins and other notices the manufacturer sent to dealers. A bulletin is not a recall; the 60 most recent are listed.
- IK1201493 Aug 20, 2026 · Service Bulletin/Repair Instructions
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. 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 … - IK1201493 May 4, 2026 · Service Bulletin/Repair Instructions
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. 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 … - 26101 May 22, 2026 · Service Campaign
Certain International® trucks and IC BusTM CE Series buses may have out of date BCM programing that may cause erroneous fault codes after a vehicle sits for 2 or 3 days. - IK2600255 Apr 23, 2026 · Service Bulletin/Repair Instructions
This document provides guidance for assessing the feasibility of implementing a customer-requested change to an engine or vehicle parameter/feature. Customer requested changes will be approved in accordance with the requirements specified in 40 CFR Part 103… - IK1500105 Apr 23, 2026 · Service Bulletin/Repair Instructions
This document is for Diesel buses MY2020, MY2021, MY2022, MY2023, and MY2024 specifically built between 11/30/20 and 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/… - 26101 Apr 7, 2026 · Service Campaign
Certain International® trucks and IC BusTM CE Series buses may have out of date BCM programing that may cause erroneous fault codes after a vehicle sits for 2 or 3 days. - IK4300035 Feb 3, 2026 · Service Bulletin/Repair Instructions
This tool is designed to compare Diamond Logic feature data across multiple vehicle configuration files. 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… - IK2600255 Jan 26, 2026 · Other
This document provides guidance for assessing the feasibility of implementing a customer-requested change to an engine or vehicle parameter/feature. Customer requested changes will be approved in accordance with the requirements specified in 40 CFR Part 103… - IK2600090 Feb 5, 2026 · Other
New CARB Idle Reduction Change Request - IK2600047 Jan 2, 2026 · Service Bulletin/Repair Instructions
Engine replacements for all International engines will need to follow this procedure. - IK1600272 Dec 19, 2025 · Service Bulletin/Repair Instructions
This document will guide the user through a step-by-step procedure for detecting water leaks in vehicle cabs and windshields using an ultrasonic sound detector. - IK1500112 Dec 12, 2025 · Service Bulletin/Repair Instructions
This article will guide the reader through steps to help gain a general understanding of the LPG Gen 1 and Gen 2 fuel supply systems, as well as proper fuel system checks to obtain boost pressure. - IK2200169 Nov 8, 2025 · Service Bulletin/Repair Instructions
This 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. See symptoms below for an example of the issue. - IK2200119 Nov 7, 2025 · Service Bulletin/Repair Instructions
IC Bus Operator's Manuals - IK1201009 Nov 6, 2025 · Service Bulletin/Repair Instructions
In some geographic areas, ambient temperatures reaching below 15°F (-10 °C), including high levels of humidity, an operator may experience engine stalling, low performance, and or poor aftertreatment performance. This is caused by condensation accumulating … - IK0600030 Dec 5, 2025 · Service Bulletin/Repair Instructions
This document will guide the user through understanding Prop Shaft Codes and understanding the variations of prop codes. (Metric Prop codes start with the number a 4 and Non metric Prop codes start with a 2.) - IK1201521 Oct 10, 2025 · Service Bulletin/Repair Instructions
This document will guide users through supplemental oil consumption diagnostics for 8.8L PSI gas and propane engines. - IK1201490 Sep 18, 2025 · Service Bulletin/Repair Instructions
The purpose of this article is to provide updated guidance regarding PSI 8.8L repair versus engine replacement. - IK3400001 Aug 28, 2025 · Service Bulletin/Repair Instructions
Title: Service Portal iKNow Feedback Case Types Applies To: All - IK2300042 Aug 13, 2025 · Service Bulletin/Repair Instructions
Title: Driveline Vibration w/SPL170 Applies To: 2021 - 2025 International® IC Bus® Electric CE Series - IK2300017 Aug 26, 2025 · Service Bulletin/Repair Instructions
Title: Electric Vehicle Air Dryer Operation - IK1400005 Aug 25, 2025 · Service Bulletin/Repair Instructions
Title: Driveline Information Center and Troubleshooting Procedures Applies To: All Vehicles - IK2200170 Jul 11, 2025 · Service Bulletin/Repair Instructions
Title: Next Gen CE Bus Starter Interlock Dash Chime Applies To: Next Gen CE Bus with starter interlock feature built prior to 2/19/25 - IK1900022 Jul 18, 2025 · Service Bulletin/Repair Instructions
Title: A/C Refrigerant and Oil Capacities Applies To: All current models - IK0900157 Jul 17, 2025 · Service Bulletin/Repair Instructions
Title: Fan belt replacement guidelines for frayed edges Applies To: All Models - IK0800686 Jul 18, 2025 · Service Bulletin/Repair Instructions
Title: Radio Clock is Freezing Applies To: Next Gen CE Bus - IK2300021 Jun 26, 2025 · Service Bulletin/Repair Instructions
Title: Servicing Air Conditioning Systems on Electric Vehicles - IK0500054 Jun 4, 2025 · Service Bulletin/Repair Instructions
Title: Steering Gear Seal Repair Guidelines Applies To: Steering gears - IK2600069 May 20, 2025 · Service Bulletin/Repair Instructions
Title: How to Request a Horsepower Quote Applies To: All International and Cummins Electronic engines - IK2200088 Apr 22, 2025 · Service Bulletin/Repair Instructions
Title: Factory Installed Air Conditioning, EC4.0 System BE, CE, FE, RE Bus Models - IK2300041 Apr 21, 2025 · Service Bulletin/Repair Instructions
Title: 6090/6091 Connector Damage Applies To: IC Bus® Electric CE Series, International® eMV™ Series - IK1400023 Oct 8, 2024 · Service Bulletin/Repair Instructions
This article addresses chassis lean conditions on all chassis. 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 i… - IK0900141 Aug 6, 2024 · Service Bulletin/Repair Instructions
This document will guide a user to replace and reroute Charge Air Cooler (CAC) for vehicles built with the Cummins ISB and B6.7 engines. - iK1201485 Jul 17, 2024 · Service Bulletin/Repair Instructions
This document will guide the user through the exhaust manifold inspection process and cover the change in the exhaust manifold installation procedure to prevent damage due to thermal expansion. - IK1201493 May 22, 2024 · Service Bulletin/Repair Instructions
The purpose of this article is to provide updated repair guidelines for the engine oil pan leak on all 8.8L gasoline and LPG. - IK0400037 Apr 29, 2024 · Service Bulletin/Repair Instructions
This document is to guide users to eliminate brake pedal rattle noise. - IK08000403 Apr 24, 2024 · Service Bulletin/Repair Instructions
This document details the procedure that must be followed to ensure proper alternator troubleshooting. - IK0800482 Apr 24, 2024 · Service Bulletin/Repair Instructions
This document covers battery diagnostics, maintenance and storage requirement. - IK0800351 Nov 21, 2023 · Service Bulletin/Repair Instructions
J1939 Data Link Source Address Information - IK2600069 Sep 7, 2023 · Service Bulletin/Repair Instructions
How to request a horsepower quote; all International and Cummins engines - IK2200109 Sep 25, 2023 · Service Bulletin/Repair Instructions
Bus seat back foam inspection guidelines - IK1201457 Sep 22, 2023 · Service Bulletin/Repair Instructions
Cummins B6.7 Grid Heater Relay - IK0400040 Sep 26, 2023 · Service Bulletin/Repair Instructions
General Wheel Speed Sensor Troubleshooting - IK0300010 Sep 29, 2023 · Service Bulletin/Repair Instructions
Diagnosis of chassis wander complaints. - IK2200154 Aug 18, 2023 · Service Bulletin/Repair Instructions
Luggage rack upholstery repair; only busses equipped with luggage rack. - IK0800351 Aug 14, 2023 · Service Bulletin/Repair Instructions
J1939 Data Link Source Address Information - IKo800080 Aug 14, 2023 · Service Bulletin/Repair Instructions
J1939 Data Link Troubleshooting - IK1500105 Jun 21, 2023 · Service Bulletin/Repair Instructions
Bus Diesel fuel Cap Leaks; only models built 11/30/2020 through 05/18/2023 - IK0700120 Jun 16, 2023 · Service Bulletin/Repair Instructions
QLS Emergency Calibration Revert Process - IK2200152 May 31, 2023 · Service Bulletin/Repair Instructions
CE Bus Engine Cover Sealing - IK0700120 May 10, 2023 · Service Bulletin/Repair Instructions
QLS Emergency Calibration Revert Process - 22502 May 10, 2023 · Service Bulletin/Repair Instructions
Per agreement with EPA and CARB, Cummins, Inc. 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… - IK1200101 Mar 23, 2023 · Service Bulletin/Repair Instructions
Cummins Programming guide and fault codes285 & 265; only vehicles built with Cummins B6.7, X15, or L9 engines - IK0800554 Mar 21, 2023 · Service Bulletin/Repair Instructions
Telematics installation guidelines - Only units with 500K data link - IK0800407 Mar 15, 2023 · Service Bulletin/Repair Instructions
Starter diagnostics and warranty claim procedure for all engines and all chassis EXCLUDING vehicles equipped with PSI engines or Cummins ISB engine with Allison transmissions - IK0900141 Feb 23, 2023 · Service Bulletin/Repair Instructions
Air Compressor Inlet Hose Chaffing / Leaking - IK0700115 Jan 10, 2023 · Service Bulletin/Repair Instructions
QLS Emergency ECM Calibration; only models equipped with Cummins B6.7, X15, L9, or International A26 engines - IK0800351 Nov 16, 2022 · Service Bulletin/Repair Instructions
J1939 Data link source address information - IK0700115 Nov 18, 2022 · Service Bulletin/Repair Instructions
QLS Emergency Calibration. applies to 2016 and newer Cummins B6.6, X15, and L9 engines and all A26 engines - 22519 Nov 2, 2022 · Service Bulletin/Repair Instructions
In cold weather, especially during engine warmup, the engine may experience a misfire condition resulting in setting the Malfunction Indicator Lamp (MIL) and possible increase in emissions. Only models with Generation II PSI 8.8L LP engines.
Source: NHTSA manufacturer communications files.