2021 Ic Bus Resb Problems: 0 Complaints, 3 Recalls

The worst 2021 Ic Bus Resb problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

Tap a problem to see which part fails, at what mileage and in which other years.

Structure: bodyReported September 4, 2025 · 457 vehicles affected

What is wrong: International Motors, LLC (International) is recalling certain 2016-2026 IC Bus CESB and 2016-2021 RESB school buses. The underfloor reinforcement may not have been installed, compromising the structural integrity of the buses. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) numbers 210, "Seat Belt Assembly Anchorages" and 222, "School Bus Passenger Seating and Crash Protection."
Risk: Reduced structural integrity may increase the risk of injury in a crash.
Remedy: Dealers will inspect and install a reinforcement channel as necessary, free of charge. Owner notification letters were mailed December 8, 2025. Owners may contact International customer service at 1‑800‑448‑7825. International's number for this recall is 25514.

Recall number 25V580000 · Recall details

Service brakes, air: antilock: ABS warning lightReported May 25, 2023 · 19,376 vehicles affected

What is wrong: Navistar, Inc. (Navistar) is recalling certain 2021-2024 IC Bus RE, 2022-2024 IC Bus CE, and IC Bus EV school buses. The anti-lock brake system (ABS) indicator light does not remain illuminated when a malfunction exists, and when the vehicle's ignition switch is on, and the vehicle is in motion. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
Risk: An ABS indicator light that fails to remain illuminated will not alert the driver of an ABS malfunction, which could increase the risk of a crash.
Remedy: Dealers will update the software, free of charge. Owner notification letters are expected to be mailed July 24, 2023. Owners may contact Navistar's customer service at 1‑800‑448‑7825. Navistar's number for this recall is 23516.

Recall number 23V371000 · Recall details

Fuel system, diesel: fuel injection system: fuel railReported May 19, 2021 · 933 vehicles affected

What is wrong: Navistar, Inc. (Navistar) is recalling certain 2019-2021 IC Bus RE School Buses. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.
Risk: A fuel leak in the presence of an ignition source increases the risk of a fire.
Remedy: Dealers will inspect the rail threads, and replace the rail as necessary, free of charge. Owner notification letters were mailed on June 21, 2021. Owners may contact Navistar customer service at 1‑800‑448‑7825.

Recall number 21V367000 · Recall details

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

Is the 2021 Ic Bus Resb reliable?

Owners have filed 0 complaints about the 2021 Ic Bus Resb.

What is the most common problem with the 2021 Ic Bus Resb?

There are not enough complaints to tell.

How many recalls does the 2021 Ic Bus Resb have?

3 recalls, covering structure, service brakes, air and fuel system, diesel.

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