Recall 24V232 affects 106 2024-2025 Mack Lr natural gas vehicles for a missing methane detector fuse. Repair is free at any franchised Mack dealer.
Mack is recalling 106 2024-2025 Lr natural gas vehicles because a missing fuse can leave the methane detector inoperative. Without that warning, a gas leak can go undetected and raise the risk of fire or injury; Mack dealers will complete the repair free of charge.
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What's wrong?
The methane detector on 2024-2025 Mack Lr natural gas trucks watches for methane in and around the natural gas system. It should receive electrical power through a 10A Type F fuse in the fuse and relay center, then report an "OK" status on the panel display when the detector is working.
On affected trucks, that fuse was left out during a product update. Without the fuse, the detector has no complete power path, so the methane detection system is inoperative instead of standing ready to warn the driver during a natural gas leak. The repair part is the same fuse installed in the correct fuse and relay position.
The warning sign is on the panel display: the methane detector will not show an "OK" status, and the indicator lights will not appear. If there is a natural gas leak, a leaking-gas sound or a faint gas smell on the compressed natural gas vehicle is another sign to treat the truck as unsafe until it is checked.
Who's affected?
Both model years use the same 10A Type F fuse in the wiring system.
| 2024 Mack Lr | wiring |
|---|---|
| 2025 Mack Lr | wiring |
| Units affected | 106 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not confirm inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
An inoperative methane detector can miss a natural gas leak, increasing the risk of fire or injury. If the panel does not show an "OK" status, indicator lights are absent, you hear leaking gas, or notice a faint gas smell, call a Mack dealer before further use. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2024-2025 Mack Lr is included in this recall.
- Contact your nearest franchised Mack dealer to schedule the free fuse installation that restores the methane detector.
- Bring the owner letter if you have it, and reference recall number 24V232 (Mack recall SC0461) when you call.
- Avoid operating the truck if you smell gas or suspect a leak; call Mack customer service or your dealer before moving it.
What happens at the repair
At the dealer, a Mack technician installs the missing fuse for the methane detector so the detector receives power and can operate as intended. The recall repair is free, with parts and labor covered by Mack. If you already paid out of pocket for a related methane detector or fuse repair before the recall work, Mack's standard reimbursement plan covers documented expenses. Bring receipts or repair paperwork to the service desk, or contact Mack customer service for claim instructions.
| Reimbursement | Reimbursement available |
|---|
Timeline
| March 27, 2024 | NHTSA published the recall |
|---|---|
| April 5, 2024 | Dealer notification began |
| April 5, 2024 | Dealer notification ended |
| April 10, 2024 | Owner notification mailed |
| May 24, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| May 24, 2024 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 24V232?
Recall 24V232 covers 106 2024-2025 Mack Lr natural gas vehicles with a methane detector that lacks the fuse it needs to operate. An inoperative detector can fail to detect a gas leak, increasing fire or injury risk. Mack dealers will install the fuse for free.
What should I do if my 2024-2025 Mack Lr is on this recall?
Check your VIN to confirm your specific 2024-2025 Mack Lr is included in recall 24V232. If it is, contact a franchised Mack dealer to schedule fuse installation. Reference Mack recall SC0461 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mack's remedy says dealers will install the missing methane detector fuse free of charge at any franchised Mack dealer.
What is the safety risk?
The risk is an undetected gas leak. If the methane detector is inoperative, it can fail to warn the driver or service crew about a leak, increasing the risk of a fire or injury. The dealer repair restores the fuse needed for detector operation.
When were owners notified about recall 24V232?
Mack mailed owner notification letters on April 10, 2024. If you own a 2024-2025 Mack Lr and never received a letter, check your VIN and call a franchised Mack dealer with recall number SC0461.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V232000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 24V232 |
| NHTSA recall # (full) | 24V232000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
- Download Recall Report (PDF)
- Download Owner Notice (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 →