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Mack inaccurate axle load calculations may cause reduced braking performance while transporting smoothbore tanker trailers.

NHTSA campaign 26V-620 · Reported September 28, 2026 · 850 vehicles affected

AFFECTED MODELS
Mack Anthem and Pioneer
VEHICLES AFFECTED
850
REMEDY
Dealers will install new software to disable the dynamic trailer braking calculations, free of charge.
COST
Free

The short version

Mack Trucks, Inc. reported a problem with the service brakes, electric software/programming. Here is what owners need to know.

WHAT

Inaccurate axle load calculations may cause reduced braking performance while transporting smoothbore tanker trailers.

WHY IT MATTERS

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

WHAT TO DO

Take it to a dealer — they will install new software to disable the dynamic trailer braking calculations, free of charge.

Affected vehicles

These model years are included in NHTSA campaign 26V-620.

YEAR RANGEMODEL
2026–2027Mack Anthem
2026–2027Mack Pioneer

What changed

Newest first. The record shows both when the recall began and what has changed since.

  1. Recall reported to NHTSA. LATEST
  2. Recall reported to NHTSA.

Drive one of these? Check your VIN to see if your specific vehicle is affected.

Check your VIN

What this record means

Data from the NHTSA recall database. A clean VIN check means no open federal recalls for that vehicle — not that it never had one.

Not affiliated

MyAutoRecalls is not affiliated with Mack Trucks, Inc. or the National Highway Traffic Safety Administration.