Recall 24V421 affects 45 2022-2023 Nova Bus Lfs buses for an unsecured HVAC ground connection. Repair is free at any franchised Nova Bus dealer.
Nova Bus is recalling 45 2022-2023 Lfs buses because an unsecured ground connection in the HVAC roof unit can shut the engine down unexpectedly or overheat. An unexpected shutdown increases crash risk, and an overheated ground connection increases fire risk; Nova Bus dealers will complete the repair free of charge.
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What's wrong?
The HVAC roof unit on the 2022-2023 Nova Bus Lfs is the roof-mounted heating, ventilation, and air conditioning system for the bus. Inside that unit, a ground bus bar connection gives electrical current a safe return path. That ground connection needs the right clamping force so it stays tight during normal operation.
On affected buses, the ground connection inside the HVAC roof unit was not tightened to the correct torque. A loose connection creates extra electrical resistance at the bus bar. That resistance can overheat the ground connection, and the electrical interruption can also shut the engine down unexpectedly.
There is no warning sign before the shutdown or overheated connection. The corrected repair applies the proper torque to the ground bus bar connection, and a visible torque seal confirms the connection was secured.
Who's affected?
Both model years point to the same roof unit electrical system.
| 2023 Nova Bus Lfs | electrical system |
|---|---|
| 2022 Nova Bus Lfs | electrical system |
| Units affected | 45 |
| Field incidents | NHTSA has logged no 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?
Unexpected engine shutdown increases crash risk, and an overheated ground connection increases fire risk. There is no warning sign before this happens, so schedule the ground connection inspection and tightening soon. Repair is free at any franchised Nova Bus dealer.
What should I do?
- Check your VIN to confirm your 2022-2023 Nova Bus Lfs bus is included in this recall.
- Contact a franchised Nova Bus dealer to schedule the free inspection and bus-bar ground-connection tightening in the HVAC roof unit.
- Ask the dealer to apply the correct torque to the ground connection so the repair addresses the shutdown and overheating risk.
- Bring the recall notice if Nova Bus mailed one. If not, reference recall number 24V421 and Nova Bus recall CR5605 when you call.
- Keep the bus out of passenger service if it shuts down unexpectedly or shows signs of overheating, then contact Nova Bus for service direction.
What happens at the repair
At the dealer, a Nova Bus technician inspects the ground connection on the bus bar in the HVAC roof unit and tightens it to the correct torque. Parts and labor are covered under the recall. For a prior related repair paid out of pocket, contact Nova Bus customer service and ask how the manufacturer's standard reimbursement plan applies to documented expenses.
| Reimbursement | Reimbursement available |
|---|
Timeline
| June 7, 2024 | NHTSA published the recall |
|---|---|
| June 10, 2024 | Dealer notification began |
| June 10, 2024 | Dealer notification ended |
| July 24, 2024 | Owner notification mailed |
| August 8, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 8, 2024 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 24V421?
Recall 24V421 covers 45 2022-2023 Nova Bus Lfs buses with an HVAC roof unit ground connection that was not secured properly. The issue can cause an unexpected engine shutdown or an overheated ground connection. Nova Bus will inspect and tighten the connection for free.
What should I do if my 2022-2023 Nova Bus Lfs is on this recall?
Check your VIN to confirm your specific bus is included in recall 24V421. If it is, contact Nova Bus customer service at 1-800-350-6682 and reference recall CR5605. Nova Bus will inspect and tighten the HVAC roof unit ground connection for free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and Nova Bus will inspect and tighten the ground connection on the HVAC roof unit bus bar free of charge.
What is the safety risk in recall 24V421?
The safety risk is engine shutdown or overheating at the HVAC roof unit ground connection. An unexpected engine shutdown increases crash risk, and an overheated ground connection increases fire risk. The free repair is an inspection and tightening of the ground connection.
When were owners notified about recall 24V421?
Nova Bus mailed owner notification letters on July 24, 2024. If you bought the bus used or did not receive a letter, check your VIN and contact Nova Bus customer service with recall number CR5605.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V421000 |
|---|---|
| Nova Bus customer service | 1-800-350-6682 |
| NHTSA recall # | 24V421 |
| NHTSA recall # (full) | 24V421000 |
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 →