Recall 24V231 covers 653 2020-2024 Nova Bus Lfs buses for engine coolant return hose failure. Repair is free at any franchised Nova Bus dealer.
Nova Bus is recalling 653 2020-2024 Lfs buses under recall 24V231 because the engine coolant return hose can fail, leak coolant, and shut the engine down. An unexpected shutdown increases crash risk and creates added danger when passengers transfer from a disabled bus; Nova Bus dealers will complete the free repair.
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What's wrong?
The engine coolant return hose on 2020-2024 Nova Bus Lfs buses carries coolant back through the engine cooling system after it absorbs heat. That flow keeps engine temperature under control during route service, idling, and stop-and-go operation. The hose has to tolerate coolant chemistry, heat, and pressure without softening, cracking, or leaking.
On the recalled buses, the hose material is not the right match for the long life coolant and cooling-system temperatures. The hose can fail and leak coolant. Once enough coolant is lost, the engine loses the fluid it needs to control temperature, and the bus can shut down.
Do not count on a warning before the hose itself fails. Nova Bus identified a red lamp on the driver display when coolant reaches the critical low level, with a 30 second warning before engine shutdown. The remedy uses an updated silicone coolant return hose designed for those temperatures.
Who's affected?
The scope spans 2020 through 2024 Lfs buses, all tied to the same cooling-system hose component.
| 2022 Nova Bus Lfs | Hoses/lines/piping/fittings |
|---|---|
| 2023 Nova Bus Lfs | Hoses/lines/piping/fittings |
| 2020 Nova Bus Lfs | Hoses/lines/piping/fittings |
| 2021 Nova Bus Lfs | Hoses/lines/piping/fittings |
| 2024 Nova Bus Lfs | Hoses/lines/piping/fittings |
| Units affected | 653 |
| 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?
An unexpected engine shutdown increases the risk of a crash, and moving passengers from a disabled bus increases injury risk. There is no reliable warning before coolant return hose failure; if the low-coolant threshold is met, a red lamp gives a 30 second warning before shutdown. Schedule the repair soon. Repair is free at any franchised Nova Bus dealer.
What should I do?
- Check your VIN to confirm your 2020-2024 Nova Bus Lfs is included in this recall.
- Contact a franchised Nova Bus dealer to schedule the free engine coolant return hose replacement that fixes the coolant leak risk and engine shutdown risk.
- Bring the recall notice if Nova Bus mailed one. If not, reference recall number 24V231 when you call.
- Watch for coolant leaks or an engine shutdown, and remove the bus from passenger service if either happens before the repair.
- Call Nova Bus customer service at 1-800-350-6682 with questions and reference Nova Bus recall CR5577.
What happens at the repair
At the dealer, a Nova Bus technician replaces the engine coolant return hose. That repair addresses hose failure that can leak coolant and shut down the engine. The replacement parts and labor are free under the recall. Nova Bus's standard reimbursement plan covers eligible owner paid repairs completed before the recall notice. Keep invoices and repair records, then ask Nova Bus customer service or the service desk how to submit documentation for review.
| Reimbursement | Reimbursement available |
|---|
Timeline
| March 27, 2024 | NHTSA published the recall |
|---|---|
| March 30, 2024 | Dealer notification began |
| March 30, 2024 | Dealer notification ended |
| May 26, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| May 26, 2024 | Interim owner notification (was planned for this date) |
| July 3, 2024 | Owner notification mailed |
Frequently asked questions
What is recall 24V231?
Recall 24V231 covers 653 2020-2024 Nova Bus Lfs vehicles with an engine coolant return hose that can fail, leak coolant, and cause an engine shutdown. Nova Bus will replace the engine coolant return hose for free.
What should I do if my 2020-2024 Nova Bus Lfs is on this recall?
Check your VIN to confirm whether your specific bus is included in recall 24V231. If it is, contact a franchised Nova Bus dealer or service location to schedule the engine coolant return hose replacement. Reference recall CR5577 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Nova Bus will replace the engine coolant return hose free of charge. Parts and labor are covered for included vehicles.
What is the safety risk?
The safety risk is an unexpected engine shutdown. That increases crash risk, and moving passengers from a disabled bus also increases injury risk. If your VIN is included, arrange the free hose replacement with Nova Bus.
When were owners notified about recall 24V231?
Nova Bus mailed owner notification letters on July 03, 2024. If you manage or bought a used Nova Bus Lfs and never received a letter, check your VIN and reference recall 24V231 or Nova Bus recall CR5577 when contacting service.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V231000 |
|---|---|
| Nova Bus customer service | 1-800-350-6682 |
| NHTSA recall # | 24V231 |
| NHTSA recall # (full) | 24V231000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Document (PDF) (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 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →