Mack recall - Software/Programming

NHTSA · September 28, 2026

• NHTSA recall campaign 26V620000 (Mack), reported September 28, 2026.
• Potentially affected vehicles: 850.
• Component: Software/Programming.
• Details as of October 1, 2026; the linked official notice is authoritative for lot codes, VINs, and remedies.

Agency

NHTSA

Posted

September 28, 2026

Recalling firm

Mack Trucks, Inc.

Source ID

26V620000

NHTSA campaign →

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.

Consequence

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.

Affected vehicles

Related: Vehicle recalls · All recall events