Recall 25V801 affects 46 2025-2026 Mack Pioneer Pr (4) trucks for loose load lock clamps. Repair is free at any franchised Mack dealer.
Mack is recalling 46 2025-2026 Pioneer Pr (4) trucks because load lock clamps on the back of the cab can loosen, leaving the load lock bars unsecured. A loose bar can drop cargo onto the road and increase crash risk; Mack dealers will complete the recall repair free of charge.
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What's wrong?
The load lock clamp on 2025-2026 Mack Pioneer Pr (4) trucks is the bracket on the back of the cab that holds the load lock bar in place. The bar is part of the truck's equipment securement system, and the clamp is supposed to keep that bar seated while the truck is in service.
On affected trucks, the clamp design is not strong enough for this use. The original clamp is plastic, and it can loosen from the back of the cab. Once the clamp loosens, the load lock bar is no longer secured. Mack's remedy uses steel clamps instead of plastic clamps.
There is no warning sign before failure. An owner or driver should not expect a light, sound, or change in truck operation before the clamp loosens and the bar comes unsecured.
Who's affected?
VINs became searchable on November 27, 2025.
| 2025 Mack Pioneer Pr (4) | Mechanical |
|---|---|
| 2026 Mack Pioneer Pr (4) | Mechanical |
| Units affected | 46 |
| 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 truck is included.
What's the safety risk?
A loose or unsecured load lock bar can let cargo fall from the truck. That cargo creates a road hazard and increases the risk of a crash. Secure cargo before every trip and schedule the clamp replacement soon. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2025-2026 Mack Pioneer Pr (4) is included in this recall.
- Contact a franchised Mack dealer to schedule the free load-lock-clamp replacement that secures the load lock bars behind the cab.
- Bring the recall notice if Mack has mailed one. If not, reference recall number 25V801 when you call.
- Inspect the load lock bars before each trip and do not carry cargo with loose or unsecured bars until the repair is complete.
What happens at the repair
At the dealer, a Mack technician replaces the load lock clamps on the back of the cab so the load lock bars stay secured. The recall covers the replacement parts and labor, so the dealer repair is free. If you've already paid out of pocket for this repair before the recall notice, Mack's standard reimbursement plan covers documented expenses. Bring repair invoices or payment records to the service desk, or contact Mack customer service for the claim path.
| Reimbursement | Reimbursement available |
|---|
Timeline
| November 20, 2025 | NHTSA published the recall |
|---|---|
| November 27, 2025 | Dealer notification began |
| November 27, 2025 | Dealer notification ended |
| November 27, 2025 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| December 18, 2025 | Owner notification mailed |
| January 15, 2026 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 25V801?
Recall 25V801 covers 46 2025-2026 Mack Pioneer Pr (4) vehicles with load lock clamps on the back of the cab that can loosen. If the load lock bars become unsecured, cargo can fall from the vehicle, create a road hazard, and increase crash risk.
What should I do if my 2025-2026 Mack Pioneer Pr (4) is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 25V801. If it is, contact a franchised Mack dealer to schedule replacement of the load lock clamps. Reference Mack recall number SC0489 when you call. The dealer 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 replace the load lock clamps free of charge. Parts and labor are covered at a franchised Mack dealer.
What is the safety risk in recall 25V801?
The safety risk is cargo loss from a loose or unsecured load lock bar. Cargo falling from the vehicle can create a road hazard for nearby traffic and increase the risk of a crash. The repair path is to have the dealer replace the load lock clamps.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V801000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 25V801 |
| NHTSA recall # (full) | 25V801000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →