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2026-2027 Mack Anthem An (4) and Mack Pioneer PR (4) recall: software/programming

Mack Trucks, Inc. reported this safety recall on September 28, 2026. It covers about 850 vehicles.

vehicles affected
850
reported
Sep 28, 2026
owners notified
Oct 29, 2026

Service brakes, electric: software/programming

What is wrong
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.
Remedy
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 on October 5, 2026.

Recall number 26V620000

Affected vehicles

Questions about recall 26V620000

Is there a recall on the 2026-2027 Mack Anthem An (4) and Mack Pioneer PR (4) software/programming?

Yes. Recall 26V620000, reported on September 28, 2026, covers about 850 vehicles.

What is the fix for recall 26V620000?

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 on October 5, 2026.

Is the recall repair free?

Safety recall repairs are done free of charge at authorized dealers. A dealer can confirm with the VIN whether a specific vehicle is included and whether the repair has already been done.

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