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Mack Trucks, Inc.: Software Calculation Error May Cause Reduced Braking Performance

Recall date · Source: U.S. National Highway Traffic Safety Administration

What to do

Dealers will install new software to disable the dynamic trailer braking calculations, free of charge.

Company
Mack Trucks, Inc.
Reason
Mack Trucks, Inc. (Mack) is recalling certain 2026-2027 Anthem AN (4) and Pioneer PR (4) vehicles equipped with a tanker application package. Inaccurate axle load calculations may cause reduced braking performance while transporting smoothbore tanker trailers.
Hazard
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
Who’s affected
850 potentially affected
Where
Nationwide
Remedy
Dealers will install new software to disable the dynamic trailer braking calculations, free of charge. Owner notification letters are expected to be mailed November 27, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0500. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov on October 5, 2026.
Remedy contact
Owners may contact Mack's customer service at 1-800-866-1177.
Official notice
www.nhtsa.gov/recalls?nhtsaId=26V620000…

Products

  1. Recalled: certain 2026-2027 Anthem AN (4) and Pioneer PR (4) vehicles equipped with a tanker application package. Inaccurate axle load calculations may cause reduced braking performance while transporting smoothbore tanker trailers.

    Vehicle · SERVICE BRAKES, ELECTRIC

Update history

  1. First listed on OVERLOOKED from the official record.

When the agency expands or changes this recall, we update this page and log the change here.

Proof: raw official record (JSON) · fetched from NHTSA API

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