Ic Bus recalls 19,376 2021-2024 Cesb, Resb, and Evsb buses under 23V371 for an ABS warning-light defect. Free software update at franchised Ic Bus dealers.
Ic Bus is recalling 19,376 2021-2024 Cesb, Resb, and Evsb school buses because the ABS indicator light does not stay illuminated when an ABS malfunction exists. Without that warning, the driver is not alerted to the problem, which raises crash risk, and Ic Bus dealers will repair the buses free of charge.
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What's wrong?
The ECU ABS software on these 2021-2024 Ic Bus Cesb, Resb, and Evsb school buses controls part of the air brake anti-lock system. ABS is the system that helps keep wheels from locking during hard braking. Its dashboard indicator light is supposed to stay on when the system has a malfunction, so the driver knows the brake control system needs service.
In the recalled buses, the ABS software contains a blink code command that interferes with the ABS indicator lamp command on the vehicle data network. When an ABS fault is active and the bus is moving, that interference can turn the ABS light off. The light comes back on when the bus stops, which hides the fault during driving instead of keeping the warning visible.
Drivers still have warning signs. A fault in the ABS system also turns on the Traction Control and Stability Control indicator lamps, and those lamps remain on while the bus is moving.
Who's affected?
Covers the Cesb, Resb, and Evsb bus lines across the 2021-2024 model years, all tied to the same anti-lock brake system software.
| 2024 Ic Bus Cesb | anti-lock brake system (ABS) |
|---|---|
| 2024 Ic Bus Resb | anti-lock brake system (ABS) |
| 2022 Ic Bus Cesb | anti-lock brake system (ABS) |
| 2024 Ic Bus Evsb | anti-lock brake system (ABS) |
| 2022 Ic Bus Evsb | anti-lock brake system (ABS) |
| 2022 Ic Bus Resb | anti-lock brake system (ABS) |
| 2023 Ic Bus Cesb | anti-lock brake system (ABS) |
| 2021 Ic Bus Resb | anti-lock brake system (ABS) |
| 2023 Ic Bus Resb | anti-lock brake system (ABS) |
| 2023 Ic Bus Evsb | anti-lock brake system (ABS) |
| Units affected | 19,376 |
| Field incidents | NHTSA has logged no field incidents to date. |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
If the ABS indicator light does not stay on after an ABS malfunction, the driver loses the warning that the anti-lock brake system needs attention. Traction Control and Stability Control indicator lamps remain on while the vehicle is moving, so treat those lights as a reason to schedule service soon. Repair is free at any franchised Ic Bus dealer.
What should I do?
- Check your VIN to confirm your 2021-2024 Ic Bus Cesb, Resb, or Evsb is included in this recall.
- Contact a franchised Ic Bus dealer to schedule the free software update that keeps the ABS warning light illuminated when an ABS malfunction exists.
- Bring the recall notice if Ic Bus mailed one, or reference recall number 23V371 and Ic Bus recall 23516 when you call.
- Call Ic Bus customer service at 1-800-448-7825 with questions about dealer scheduling or fleet service timing.
What happens at the repair
At the dealer, an Ic Bus technician updates the software covered by recall 23V371. The software update is free under the recall, and parts and labor are covered. If you already paid out of pocket for a related software repair before the recall notice, the manufacturer's reimbursement plan applies. Follow the reimbursement instructions included in the customer notification and keep your repair documentation with your service records.
| Reimbursement | Reimbursement available |
|---|
Timeline
| May 25, 2023 | NHTSA published the recall |
|---|---|
| July 18, 2023 | Owner notification mailed |
| July 24, 2023 | Dealer notification began |
| July 24, 2023 | Dealer notification ended |
| July 24, 2023 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| July 24, 2023 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 23V371?
Recall 23V371 covers 19,376 2021-2024 Ic Bus Cesb, Resb, and Evsb school buses with an anti-lock brake system indicator light that fails to stay on during a malfunction. Navistar dealers will update the software for free.
What should I do if my 2021-2024 Ic Bus Cesb, Resb, or Evsb is on this recall?
Check your VIN to confirm your specific school bus is included in recall 23V371. If it is, contact a franchised Ic Bus dealer to schedule the free software update. Reference Navistar recall number 23516 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Navistar says dealers will update the software free of charge. Parts and labor are covered at a franchised Ic Bus dealer.
What is the safety risk?
The driver loses an important brake-system warning if the ABS indicator light fails to stay on during a malfunction. That missing warning increases crash risk because the driver is not alerted to the ABS problem while the school bus is in motion.
When were owners notified about recall 23V371?
Navistar mailed owner notification letters on July 24, 2023. If you manage or bought one of these school buses after that date, check your VIN and contact Ic Bus customer service at 1-800-448-7825 or a franchised dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/23V371000 |
|---|---|
| Ic Bus customer service | 1-800-448-7825 |
| NHTSA recall # | 23V371 |
| NHTSA recall # (full) | 23V371000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Acknowledgement (PDF)
- Download Recall Report (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →