Affects 2026 Mack Anthem AN (4), 2027 Mack Pioneer PR (4), 2027 Mack Anthem AN (4), 2026 Mack Pioneer PR (4). Recall repairs are free at any franchised dealer, however old the vehicle is.
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.
Risk:
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
What to do:
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.
NHTSA campaign 26V620000 — quote this at the dealer.Reported Sep 28, 2026.