Service brakes, electric: software/programmingRecall 26V-620 · Mack vehicles
Mack Trucks, Inc. recall 26V-620 covers 850 Mack vehicles for a service brakes, electric: software/programming problem, reported to NHTSA on September 28, 2026.
Source: NHTSA recall 26V620000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
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.
The risk
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
The fix
Dealers will install new software to disable the dynamic trailer braking calculations, free of charge. Owner notification letters were mailed October 29, 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.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.
Vehicles in this recall
Built from February 24, 2025 to September 26, 2026. Not every vehicle in these model years is included; check by VIN.