CR5508 – Climate Control HVAC Unit May Detach from Roof – 2020-2023 Nova Bus LFS & LFS Artic Transit Buses

November 11, 2023 NHTSA CAMPAIGN NUMBER: 23V763000

Climate Control HVAC Unit May Detach from Roof

An HVAC unit that detaches from a bus can create a road hazard, increasing the risk of a crash.


NHTSA Campaign Number: 23V763

Manufacturer Nova Bus (US) Inc.

Components EQUIPMENT

Potential Number of Units Affected 339



Nova Bus (US) Inc. (Nova Bus) is recalling certain 2020-2023 LFS and LFS Artic transit buses. The brackets retaining the Mobile Climate Control HVAC Unit could fail and allow the unit to detach from the bus.



Nova Bus will inspect the existing brackets and install additional brackets, as necessary, free of charge. Owner notification letters are expected to be mailed December 20, 2023. Owners may contact Nova Bus customer service at 1-800-350-6882. Nova Bus’s number for this recall is CR5508.



Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to


Chronology :

April 16, 2023: Nova Bus was informed that a vehicle had 2 of 4 broken retaining brackets.

May 18, 2023: Nova Bus started an internal Investigation.

June 05, 2023: The issue was raised to the safety forum as a potential risk for evaluation.

July 13, 2023: Nova Bus opens a formal potential safety related issue investigation.

October 12, 2023: Product Safety Evaluation Committee evaluates and raises to Product Safety Committee.

October 19, 2023: Evaluated at Product Safety Committee and further information requested relative to retaining forces.

October 26, 2023: Additional information presented to Product Safety Evaluation Committee for evaluation and raised to Product Safety Committee.

November 6, 2023: Product Safety Committee determination of product defect.

November 11, 2023: Nova Bus files 573 with NHTSA that a voluntary recall will be released to address the safety-related defect.

There have been no accidents or injuries related to this defect. There have been four vehicles where a broken bracket was identified during the process of the investigation.


8 Affected Products


NOVA BUS LFS 2020-2023


2 Associated Documents

Recall Acknowledgement

RCAK-23V763-8298.pdf 645.406KB



Defect Notice 573 Report

RCLRPT-23V763-9251.PDF 215.538KB



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