NHTSA recall 26V620000

Software Calculation Error May Cause Reduced Braking Performance

Mack Trucks, Inc.Reported September 28, 2026Software

Vehicles affected: 850
Completion rate: 0%
Remedy: Dealer visit
Component: SERVICE BRAKES, ELECTRIC

Description

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.

Issue

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

Consequence Summary

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

Corrective Action

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.

Internal ID: 26V620000 · Updated October 6, 2026