Mack Trucks: Software Calculation Error May Cause Reduced Braking Performance (service Brakes, Electric)

Recall Summary Mack Trucks is recalling certain 2026-2027 Anthem and Pioneer trucks with tanker packages due to a software error that miscalculates axle load, which reduces braking performance. This reduced braking capability means trucks may need more distance to stop, raising crash risk. Dealers will install corrected software at no cost to owners.

Recalling firm

Mack Trucks, Inc.

Product

Component: SERVICE BRAKES, ELECTRIC. 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.

Reason

Reduced braking performance can require a greater distance to stop, increasing the risk of a crash. 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.

Classification

Class I

Category

vehicle recall

Country

United States

Agency

National Highway Traffic Safety Administration

Recall date

2026-09-28

Status

Ongoing

Distribution

Nationwide

Official recall notice from National Highway Traffic Safety Administration

Recall details on Nibble Recalls: https://trynibble.app/recalls/127d76a3-149a-4a11-accf-f8a2013c7b76