The Recall Desk
SevereNHTSA·26V620000·Announced 2026-09-28

Mack Trucks Recalls 2026-2027 Anthem and Pioneer Models for Braking Software Issue

Mack Trucks is recalling 850 Anthem and Pioneer vehicles due to software errors that may reduce braking performance when hauling tanker trailers.

What this means for you

Illness, injury, or structural failure has been reported. Stop using the product immediately and contact the manufacturer for a refund or repair.

Our severity reasoning: The recall involves a structural vehicle defect (braking performance) that increases the risk of a crash, meeting the criteria for a Severe rating.

Plain-English summary

Mack Trucks, Inc. is recalling certain 2026-2027 Anthem AN (4) and Pioneer PR (4) vehicles equipped with a tanker application package. The recall involves 850 vehicles where inaccurate axle load calculations may cause reduced braking performance while transporting smoothbore tanker trailers.

Reduced braking performance can require a greater distance to stop, increasing the risk of a crash. 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.

The recalled product

Product
MACK ANTHEM AN (4), PIONEER PR (4)
Brand
MACK
Manufacturer
Mack Trucks, Inc.
Category
Vehicle — Heavy-Duty Trucks
Hazard
Affected units
850

Is your product affected?

Check your packaging against the codes below. If any of them match, the product is part of this recall.

Model numbers (2)

  • ANTHEM AN (4)
  • PIONEER PR (4)

Distribution

Distributed nationwide across the United States.

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