Recall 25V503 affects 16,553 2016-2024 Ic Bus Cesb school buses for brake-pressure-switch leaks. Park outside. Repair is free at any franchised Ic Bus dealer.
An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked. A service brake system light is a warning sign to park the bus outside and call the dealer. Until the repair is complete, keep it outside and away from structures. Repair is free at any franchised Ic Bus dealer.
Ic Bus is recalling 16,553 2016-2024 Cesb school buses because the brake pressure switch assembly can leak brake fluid into electrical components and cause a short. The short can overheat the circuit and raise the risk of a fire while driving or parked; park outside and away from structures until an Ic Bus dealer completes the free repair.
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What's wrong?
The hydraulic brake pressure switch on 2016-2024 Ic Bus Cesb school buses reads brake fluid pressure in the Hydromax brake system and sends that information through an electrical circuit. In normal operation, brake fluid stays on the hydraulic side of the switch while the wiring stays dry.
On affected buses, the brake pressure switch assembly lets brake fluid pass beyond the diaphragm seal and into the switch. From there, fluid can wick into the wiring and the fuse holder. Brake fluid in those electrical parts can create a short circuit, so the recalled switch lacks the fluid-blocking harness used in the remedy part.
An owner or fleet operator can see a "service brake system" malfunction indicator lamp before the switch problem is found. Until the recall remedy is performed, affected buses should be parked outdoors.
Who's affected?
Spans 9 Cesb model years, all tied to the same hydraulic brake system component.
| 2024 Ic Bus Cesb | hydraulic brake system |
|---|---|
| 2022 Ic Bus Cesb | hydraulic brake system |
| 2023 Ic Bus Cesb | hydraulic brake system |
| 2019 Ic Bus Cesb | hydraulic brake system |
| 2020 Ic Bus Cesb | hydraulic brake system |
| 2021 Ic Bus Cesb | hydraulic brake system |
| 2016 Ic Bus Cesb | hydraulic brake system |
| 2017 Ic Bus Cesb | hydraulic brake system |
| 2018 Ic Bus Cesb | hydraulic brake system |
| Units affected | 16,553 |
| Field incidents | NHTSA has logged 90 field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
An electrical short in the brake pressure switch can overheat the circuit and increase the risk of a fire while driving or parked. A service brake system light is a warning sign to park the bus outside and call the dealer. Until the repair is complete, keep it outside and away from structures. Repair is free at any franchised Ic Bus dealer.
What should I do?
- Check your VIN to confirm your 2016-2024 Ic Bus Cesb is included in this recall.
- Park the bus outside and away from structures until the recall repair is complete.
- Contact a franchised Ic Bus dealer to schedule the free silicone black jumper harness installation that addresses brake-fluid leakage into the brake pressure switch circuit.
- Bring the owner letter if you have it, and reference recall number 25V503 when you call.
- Call Ic Bus customer service at 1-800-448-7825 with questions about scheduling or vehicles previously repaired under 23V398.
What happens at the repair
Until the recall repair is complete, keep the bus parked outside and away from structures. At the dealer, an Ic Bus technician installs a silicone black jumper harness, free of charge. Vehicles previously repaired under 23V398 still need this new remedy completed. International's standard reimbursement plan applies to eligible out-of-pocket repairs paid before the recall notice. Bring receipts or repair paperwork to the service desk so the dealer can tell you how to submit the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| August 6, 2025 | NHTSA published the recall |
|---|---|
| September 22, 2025 | Dealer notification began |
| September 22, 2025 | Dealer notification ended |
| September 29, 2025 | Interim owner notification (was planned for this date) |
| December 15, 2025 | Owner notification mailed |
Frequently asked questions
What is recall 25V503?
Recall 25V503 covers 16,553 2016-2024 Ic Bus Cesb school buses with a brake pressure switch assembly that can leak brake fluid into electrical components. The short circuit can overheat and increase fire risk while driving or parked. Dealers will install a silicone black jumper harness for free.
What should I do if my 2016-2024 Ic Bus Cesb is on this recall?
Check your VIN to confirm your specific bus is included in recall 25V503. If it is, park outside and away from structures until the dealer completes the repair. Contact a franchised Ic Bus dealer to schedule the free jumper harness installation. Reference recall 25V503 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Ic Bus dealers will install the silicone black jumper harness free of charge. Parts and labor are covered for buses included in recall 25V503.
What is the safety risk?
The safety risk is fire. Brake fluid can leak into the brake pressure switch's electrical components, causing a short circuit that can overheat the circuit while the bus is being driven or while it is parked. Park outside and away from structures until the repair is complete.
When were owners notified about recall 25V503?
Owner notification letters were mailed December 15, 2025. If you manage a 2016-2024 Ic Bus Cesb and did not receive a letter, check your VIN and contact an Ic Bus dealer. Vehicles previously repaired under recall 23V398 still need this new remedy completed.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V503000 |
|---|---|
| Ic Bus customer service | 1-800-448-7825 |
| NHTSA recall # | 25V503 |
| NHTSA recall # (full) | 25V503000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Document (PDF) (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →