SC0461 – Methane Detector Inoperative – 2024-2025 Mack LR Natural Gas

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March 27, 2024 NHTSA CAMPAIGN NUMBER: 24V232000

Missing Fuse from Methane Detector

An inoperative methane detector can fail to detect a gas leak, increasing the risk of a fire or injury.


NHTSA Campaign Number: 24V232000

Manufacturer Mack Trucks, Inc.


Potential Number of Units Affected 106



Mack Trucks, Inc. (Mack) is recalling certain 2024-2025 LR natural gas vehicles. The methane detector may be inoperative due to a missing fuse.



Dealers will install a fuse, free of charge. Owner notification letters are expected to be mailed May 24, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack’s number for this recall is SC0461.



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



Certain natural gas vehicles which were ordered with a methane detector are missing a fuse, causing the methane detector to not operate.

Vehicles will be recalled and the fuse will be installed to ensure the methane detector functions properly.


Model and Model Years Affected

  • Certain 2024 and 2025 Mack LR vehicles manufactured June 14, 2023 through February 20, 2024. Vehicle Quantities
  • 137 vehicles (106 US, 31 Canada)


Dealer Responsibilities

  • The National Traffic and Motor Vehicle Safety Act and Canadian Motor Vehicle Safety Act require dealers to ensure that all new and used vehicles are free of safety defects and comply with all relevant safety standards at the time of delivery to the consumer.
  • Dealers should make their personnel aware of the safety recall. In the event that a dealer has a vehicle included in the safety recall in their inventory to be sold, the condition must be corrected before releasing it to a customer.


Notification Release Schedule

  • Vehicle list will be posted on the Trucks Dealer Portal March 28, 2024.
  • Owner notification letters will be released on or before May 24, 2024.



If you have questions or concerns about this recall, contact the Regulatory Affairs Department at


Chronology :

March 5, 2024 Mack Manufacturing reports to Product Safety Evaluation Committee that they have discovered that vehicles were built with methane detection systems which are in-operative due to missing a fuse and an investigation is opened.

March 19, 2024 Product Safety Evaluation Committee reviews the investigation findings and recommends that this be brought to the Product Safety Committee as a potential product safety defect.

March 25, 2024 The Product Safety Committee meets and determines that a product safety defect exists.

March 27, 2024 DIR report filed with NHTSA.

There have been no warranty claims, field reports, accidents or injuries reported with this issue.


2 Affected Products


MACK LR 2024-2025


3 Associated Documents

Defect Notice 573 Report

RCLRPT-24V232-7142.PDF 215.495KB


Manufacturer Notices(to Dealers,etc)

RCMN-24V232-2113.pdf 149.992KB

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Recall Acknowledgement

RCAK-24V232-2244.pdf 645.301KB


Latest Recalls Documents

For the Latest and Most recent Recall Information Visit the link below…



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Last update on 2024-03-30 / Affiliate links / Images from Amazon Product Advertising API

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