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NHTSA·Commercial vehicles·November 20, 2025

Mack recalls 2025–2026 Pioneer trucks over clamps that can loosen and free load lock bars

The load lock clamps on the back of the cab may loosen and leave the load lock bars unsecured, which can cause cargo to fall off the truck, create a road hazard and raise the risk of a crash.

What to do

Dealers will replace the load lock clamps free of charge. Owners may call Mack customer service at 1-800-866-1177 and refer to recall number SC0489.

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NHTSA recall page

Recall details

Product
Mack Pioneer Pr (4) 2025–2026
Company
Mack Trucks, Inc.
Hazard
A loose or unsecured load lock bar can result in a loss of cargo, creating a road hazard and increasing the risk of a crash.
Units
46 vehicles
Owner notification
December 18, 2025
Reported to NHTSA
November 20, 2025
Identifiers
  • NHTSA campaign number: 25V801000
  • Manufacturer campaign number: SC0489
  • Model years: 2025–2026

The headline, summary and steps above are written in plain English from the official notice below. Identifiers are copied exactly as the agency published them. Always check the official notice before you act.

Official notice

The notice's own wording from NHTSA.

Component
EQUIPMENT:MECHANICAL
Defect
Mack Trucks, Inc. (Mack) is recalling certain 2025-2026 Pioneer vehicles. The load lock clamps, located on the back of the cab, may loosen and cause the load lock bars to become unsecured.
Consequence
A loose or unsecured load lock bar can result in a loss of cargo, creating a road hazard and increasing the risk of a crash.
Corrective action
Dealers will replace the load lock clamps, free of charge. Owner notification letters were mailed December 18, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0489. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning November 27, 2025.

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