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

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MACK TRUCKS
SAFETY RECALL ALERT
© Mack Trucks, Inc. CONFIDENTIAL – For limited distribution only to circulation list above. This bulletin, and any information herein, is subject to change by Company without
notice. For the most current and accurate information, always refer to Trucks Dealer Portal for the electronic version of this document.
Description
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.
Contact
If you have questions or concerns about this recall, contact the Regulatory Affairs Department at
vtna.regulatoryaffairs@volvo.com.
Subject:
Recall Number:
Date:
Safety Recall SC0461 Methane Detector Inoperative
SRA-M461
March 28, 2024
Applicable Markets: ☒U.S. ☒Canada ☐ Export

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 24V-232
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. MAR 27, 2024 NHTSA Recall No. : 24V-232 Manufacturer Recall No. : SC0461
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 106 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2024-2025 Mack LR
Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL
Descriptive Information : The recall population is defined by specific natural gas vehicles which were ordered with a methane detector, where the methane detector is in-operative due to not having a fuse installed in the vehicle fuse relay center. There are 106 Mack/LR / Model Year 2024 and 2025.
Production Dates : JUN 14, 2023 – FEB 20, 2024 VIN Range 1 : Begin : 1M2LR7GC8RM002267 End : 1M2LR7GC6SM00266 ✔ Not sequential Description of Defect :
Description of the Defect : Specific natural gas vehicles which were ordered with a methane detector, where the methane detector is in-operative due to not having a fuse installed in the vehicle fuse relay center.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : In the event of a natural gas leak and the methane detector being inoperative, this could lead to an increased risk of fire or injury.
Description of the Cause : Engineering failed to include addition of the fuse to the fuse and relay center on these specific vehicles during a product update. Identification of Any Warning
that can Occur : The methane detector will not show an “OK” status on the panel display in the vehicle when the fuse is not present or any indicator lights. In the event that there was a natural gas leak, sound of gas leaking could indicate an issue as well as on a compressed natural gas vehicle a faint smell may indicate the
excessive levels of methane gas. Part 573 Safety Recall Report 24V-232 Page 2 Involved Components : Component Name 1 : Fuse Component Description : 10A Type F Component Part Number : 20378934 Supplier Identification : Component Manufacturer
Name : Mack Trucks
Address : 7825 National Service Rd.
Greensboro North Carolina 27409-9667 Country : United States 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. Description of Remedy :
Description of Remedy Program : Vehicles will be recalled and the fuse will be installed to ensure the
methane detector functions properly. How Remedy Component Differs from Recalled Component : Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA.
The remedy component has the necessary fuse installed to function properly. Fuse, 10A Type F, 20378934 The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 24V-232
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Identify How/When Recall Condition was Corrected in Production :
All vehicles impacted were put on hold and corrected and the methane detector is functional. Vehicles on hold will be corrected before being released.
Production was corrected on March 8, 2024. Recall Schedule :
Description of Recall Schedule : Dealer notification will begin on April 5, 2024 and owner notification will
begin on or before May 24, 2024 Planned Dealer Notification Date : APR 05, 2024 – APR 05, 2024
Planned Owner Notification Date : MAY 24, 2024 – MAY 24, 2024
* NR – Not Reported

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Date Number Release Page 04.2024 SC0461 01 1(5)
Methane Detector Inoperative
LR
RECALL INFORMATION
(April 2024)
Mack Trucks has determined that certain 2024 to 2025 model year LR trucks equipped with a natural gas engine have a missing 10 Amp fuse for the Methane Detection System.
Mack Trucks has not received warranty claims, field reports, or service reports because of this issue.
To ensure that these vehicles meet Mack’s stringent quality requirements, follow the instructions outlined below to install a 10 Amp fuse for the methane detection system and test the system functions properly.
VEHICLES AFFECTED
Certain Mack LR vehicles manufactured between June 14, 2023, through February 20, 2024.
VEHICLE QUANTITY
There are 137 vehicles affected by this recall. (106 US, 31 CAN)
SAFETY
RECALL
Mack Trucks Inc.
Greensboro, NC USA
Safety Recall Date 04.2024 Page 2 of 5
Parts
Part Number Part Description Quantity
20378934
10 Amp fuse
1
Repair Instructions
1. Secure Vehicle for Service.
2. Apply the parking brake.
3. Place the transmission in neutral or park.
4. Install the wheel chocks.
5. Remove the panel.
6. Locate slot F81 in the Fuse Relay Center.
Safety Recall Date 04.2024 Page 3 of 5
7. Install a 10 Amp fuse 20378934 in F81 of the FRC.
8. Once Fuse 81 is installed there should be a green OK light displayed on the screen.
Important note!
• If you do not see a green OK on the display contact E-service for support.
• If further information is needed for testing the operation of the Methane Detector System, follow Impact Identity 138327090 (Methane Detector, System Description).
9. Install the panel.
10. Install the fasteners.
11. Install the cover.
Safety Recall Date 04.2024 Page 4 of 5
Tightening torque Interior panel, screw 3.4 ±0.6 Nm (30 ±5 lbf⋅in)
12. Remove the wheel chocks.
13. Release the vehicle to the customer.
Safety Recall Date 04.2024 Page 5 of 5
REIMBURSEMENT
This repair is covered by an authorized Safety Recall. Reimbursement is obtained through the normal claim handling process.
UCHP Reimbursement Claim Type (used only when uploading from the Dealer Business System)
40
Recall Status
Vehicle repaired per instructions
1-Modified per instructions Labor Codes
1720-16-09-01 Campaign, General (0.1 x 3)
0.3 Causal Part
20378934 Authorization Number
C0362
Note: Dealers or the designated representatives are to perform Safety Recall on all subject vehicles at no charge to the vehicle owner regardless of mileage, age of vehicle or ownership (original purchaser or subsequent purchasers). Whenever vehicles that are subject to a Safety Recall are brought to your dealership for service, it is strongly recommended that every effort be made to perform the recall correction before the vehicle is released to the owner.

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This Notice applies to your vehicle, see enclosed “Notice of Vehicle Recall”
DEAR MACK TRUCK OWNER:
This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act.
Mack Trucks, Inc. has decided that a defect which relates to motor vehicle safety exists in certain 2024-2025 LR model vehicles manufactured June 14, 2023 through February 20, 2024.
SAFETY DEFECT:
The fuse for the methane detection system may not have been installed during production. As a result, the methane detector may not work.
Note: This recall only affects trucks equipped with a natural gas engine.
SAFETY RISK:
A methane detection system that doesn’t work could increase the risk of fire or injury.
There are no precautions you can take other than having your vehicle repaired by a Mack service center. Mack will notify owners by mail and advise you to take your truck to a dealership to install the methane detection system fuse. Recall repairs will be performed at no cost to you.
The time required to repair your vehicle is approximately 1 hour.
You should contact the nearest Mack Parts and Service Center and make an appointment. You can locate the closest Mack Parts and Service Center by going online to http://www.macktrucks.com/ and selecting “Dealer & Service Locations” or by calling our toll-free number: 1-800-866-1177.
PRECAUTIONS YOU CAN TAKE:
TIME REQUIRED FOR THE REPAIR:
WHAT YOU SHOULD DO:
SC0461_OWNER_LTR
April 2024
IMPORTANT SAFETY RECALL SC0461 NHTSA RECALL # 24V-232
NOTICE REGARDING LEASED VEHICLES:
If you are a Lessor of vehicles subject to this Notice, you have an obligation under Federal Law to provide a copy of this Notice to all Lessees within 10 days of your receipt of this Notice. Further, you must maintain a record, which identifies the Lessee(s) to whom you send a copy of this letter, the date you send this letter, and the Vehicle Identification Number(s) of the vehicle(s) that you have leased to that lessee. For purposes of this Notice, the term Lessor means: a person or entity that is the owner, as reflected on the vehicle’s title, of any five or more leased vehicles (as defined in CFR Section 577.4), as of the date of notification by the manufacturer of the existence of a safety- related defect or non-compliance with a Federal Motor Vehicle Safety Standard in one or more of the leased motor vehicles.
OWNER RECALL RESPONSE CARD:
The enclosed “Notice of Vehicle Recall” identifies your vehicle. If you no longer own the vehicle, please help us update our records by completing the “Vehicle Disposition Record” portion of the enclosed postage-free Notice of Mandatory Safety Campaign card and mailing it back to us.
ASSISTANCE/ COMPLAINTS:
PRE NOTIFICATION REMEDIES:
If your vehicle has not been repaired within a reasonable time after delivering it to a Mack Parts and Service Center, please contact:
Mack Trucks, Inc.
North American Certification and Compliance
P.O. Box 26115
Greensboro, NC 27402-6115
vtna.regulatoryaffairs@volvo.com
You may also submit complaints to the Administrator of the National Highway Traffic Safety Administration (1200 New Jersey Avenue, S.E., Washington DC 20590 or call the toll-free Auto Safety Hot Line at 1-888- 327-4236 (TTY: 1-800-424-9153), or go to http://www.safercar.gov if you believe that Mack has failed to remedy the defect without charge, or has failed to remedy the vehicle within 60 days of the owners first tender to obtain repair following the earliest time that parts are available.
If you have previously paid for repairs as a result of this issue, you may be entitled to recovery of those expenses.
Submit copies of all documentation supporting your claim according to
the rules specified in the “General Plan for Reimbursement of Pre- notification Remedies” provided in this mailing.
We regret any inconvenience this may cause to your operation, but hope you will appreciate our sincere efforts to demonstrate Mack’s commitment to provide our customers with the best possible product.
MACK TRUCKS, INC.

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