2026–2027 Mack Anthem AN (4), 2026–2027 Mack Pioneer PR (4) Recall: Inaccurate axle load calculations may cause reduced braking performance…

NHTSA campaign 26V620000 · Service Brakes, Electric · filed Sep 28, 2026 · verified Oct 2, 2026

Units reported

850

Manufacturer

Mack Trucks, Inc.

Risk

Crash / injury

Owner letters

Expected Nov 27, 2026

The defect

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.

Check whether your specific vehicle is affected

Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.

Check VIN on NHTSA →

The fix — 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.

Affected vehicles

Make	Model	Model years
Mack	Anthem AN (4)	2026, 2027
Mack	Pioneer PR (4)	2026, 2027

Related recalls

More Mack Anthem AN (4) recalls

Other campaigns involving Mack vehicles

All Mack Anthem AN (4) recalls → · All Mack recalls →

Source: NHTSA recall database, campaign 26V620000 (manufacturer number SC0500). Data last verified Oct 2, 2026.