Recall 24V657 covers 208 2019-2024 Nova Bus Lfs and Lfs Artic buses for auxiliary heater short circuits. Free repair at Nova Bus dealers.
Nova Bus is recalling 208 2019-2024 Lfs and Lfs Artic buses because contaminants can enter the auxiliary heater electronic controller and cause an electrical short. The heater can also fail, which can keep the windshield defrosting system from working properly, reduce driver visibility, and increase crash risk; Nova Bus dealers will complete the recall repair free of charge.
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What's wrong?
The auxiliary heater on 2019-2024 Nova Bus Lfs and Lfs Artic buses is a diesel-fired heater that helps warm the cabin systems and supports windshield defrosting. On these buses, Valeo Thermo+ 300 and Thermo+ 350 heater modules use an air intake and an electronic controller to manage heater operation. The controller needs clean, protected airflow to keep the heater running as designed.
On affected buses, the air intake and electronic controller were not protected well enough from contaminants. Dirt or moisture can get into the controller area, leading to an electrical short. The heater can also stop working, which leaves the defrosting system unable to clear the windshield properly.
There is no warning sign before failure. A driver or maintenance crew first notices the issue when the auxiliary heater stops producing heat or the windshield defrost system does not work properly.
Who's affected?
Covers Lfs and Lfs Artic buses across the 2019-2024 model years, with the auxiliary heater listed under electrical and visibility components.
| 2022 Nova Bus Lfs | Electrical |
|---|---|
| 2019 Nova Bus Lfs Artic | Electrical |
| 2019 Nova Bus Lfs | Electrical |
| 2019 Nova Bus Lfs | visibility component |
| 2019 Nova Bus Lfs Artic | visibility component |
| 2020 Nova Bus Lfs | Electrical |
| 2020 Nova Bus Lfs | visibility component |
| 2020 Nova Bus Lfs Artic | Electrical |
| 2020 Nova Bus Lfs Artic | visibility component |
| 2021 Nova Bus Lfs | Electrical |
| 2021 Nova Bus Lfs | visibility component |
| 2021 Nova Bus Lfs Artic | Electrical |
| 2021 Nova Bus Lfs Artic | visibility component |
| 2022 Nova Bus Lfs Artic | Electrical |
| 2022 Nova Bus Lfs Artic | visibility component |
| 2023 Nova Bus Lfs Artic | Electrical |
| 2023 Nova Bus Lfs Artic | visibility component |
| 2024 Nova Bus Lfs | Electrical |
| 2024 Nova Bus Lfs | visibility component |
| 2022 Nova Bus Lfs | visibility component |
| 2023 Nova Bus Lfs | Electrical |
| 2023 Nova Bus Lfs | visibility component |
| Units affected | 208 |
| Field incidents | NHTSA has logged 3 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 circuit can increase the risk of a fire. If the windshield defrosting system fails, driver visibility can drop and crash risk rises. There is no warning sign before the problem occurs. If your VIN is included, schedule the repair promptly. Repair is free at any franchised Nova Bus dealer.
What should I do?
- Check your VIN to confirm your 2019-2024 Nova Bus Lfs or Lfs Artic is included in this recall.
- Contact a franchised Nova Bus dealer to schedule the free auxiliary-heater air-intake repair that protects the heater controller from contaminants and supports proper windshield defrosting.
- Bring the recall notice if Nova Bus mailed one. If not, reference recall number 24V657 when you call.
- Call Nova Bus customer service at 1-800-350-6682 with questions about scheduling or repair status.
- Limit operation until the repair is complete if windshield defrosting is not working properly.
What happens at the repair
At the dealer, a Nova Bus technician repairs the auxiliary heater air intake so contaminants cannot enter the heater controller and short the electronics. The recall repair is free, including parts and labor. If you paid for a related auxiliary-heater or defroster repair before the owner letter, Nova Bus's general reimbursement plan addresses those costs. Keep the repair invoice and payment records, then contact Nova Bus customer service at 1-800-350-6682 for the claim process.
| Reimbursement | Reimbursement available |
|---|
Timeline
| September 9, 2024 | NHTSA published the recall |
|---|---|
| September 12, 2024 | Dealer notification began |
| September 12, 2024 | Dealer notification ended |
| January 28, 2025 | Owner notification mailed |
| February 1, 2025 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| February 1, 2025 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 24V657?
Recall 24V657 covers 208 2019-2024 Nova Bus Lfs and Lfs Artic buses with an auxiliary heater issue. Contaminants can enter the electronic controller and cause a short circuit, and heater failure can affect windshield defrosting. Nova Bus will address the auxiliary heater air intake for free.
What should I do if my 2019-2024 Nova Bus Lfs or Lfs Artic is on this recall?
Check your VIN to confirm your specific bus is included in recall 24V657. If it is, contact a franchised Nova Bus dealer or Nova Bus customer service at 1-800-350-6682 to arrange the auxiliary heater air intake repair. Reference recall 24V657 and Nova Bus recall CR5637.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to perform the recall repair at no cost, and Nova Bus says the auxiliary heater air intake remedy is free of charge. Use recall 24V657 when you call the dealer or Nova Bus customer service.
What is the safety risk in recall 24V657?
The safety risk is fire or reduced driver visibility. An electrical short circuit in the auxiliary heater controller can increase fire risk. If the auxiliary heater fails and the windshield defrosting system does not work properly, driver visibility can decrease and crash risk can increase.
When were owners notified about recall 24V657?
Nova Bus mailed owner notification letters on January 28, 2025. If you manage or own a 2019-2024 Nova Bus Lfs or Lfs Artic and never received a notice, check your VIN and reference recall 24V657 when you contact the dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V657000 |
|---|---|
| Nova Bus customer service | 1-800-350-6682 |
| NHTSA recall # | 24V657 |
| NHTSA recall # (full) | 24V657000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Recall Report (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Document (PDF) (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 →