Mack recalls 2026–2027 Anthem and Pioneer trucks over software that may weaken braking with tanker trailers
Software that figures out the load on each axle can get it wrong in trucks with a tanker package towing smoothbore tanker trailers, which can reduce braking and make a crash more likely.
What to do
Dealers will install new software free of charge. Owners can call Mack customer service at 1-800-866-1177 and refer to recall number SC0500.
Look up your car to see every recall for its make, model and year.
Recall details
- Product
- Mack Pioneer Pr (4), Anthem An (4) 2026–2027
- Company
- Mack Trucks, Inc.
- Hazard
- Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
- Units
- 850 vehicles
- Reported to NHTSA
- September 28, 2026
- Identifiers
- NHTSA campaign number: 26V620000
- Manufacturer campaign number: SC0500
- Model years: 2026–2027
The headline, summary and steps above are written in plain English from the official notice below. Identifiers are copied exactly as the agency published them. Always check the official notice before you act.
Official notice
The notice's own wording from NHTSA.
- Component
- SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING
- 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.
Related recalls
Mack recalls 2025–2027 Pioneer and 2026–2027 Anthem trucks over brake wiring that can short circuit
Unprotected electrical connectors on the rear brake modulators can short circuit and knock out the anti-lock brakes and electronic stability control, raising the risk of a crash or injury.
Mack Trucks, Inc. · 2,772 vehicles
Mack Pioneer Pr (4), Anthem An (4) (2025–2027) recall: Exterior Lighting
Turn signals that do not function properly may fail to indicate the driver's intention to change vehicle direction, increasing the risk of a crash.
Mack Trucks, Inc. · 86 vehicles
Mack recalls 2027 Anthem and Pioneer trucks over roof marker lights that may not light up
The center roof marker lights on these trucks may fail to illuminate, which can reduce visibility and raise the risk of a crash.
Mack Trucks, Inc. · 513 vehicles
Volvo Trucks recalls 2025–2027 VNL and 2026–2027 VNR trucks over brakes that may work poorly with tanker trailers
Trucks with a tanker package may miscalculate axle load, which can weaken braking while hauling smoothbore tanker trailers and means a longer stopping distance and a higher risk of a crash.
Volvo Trucks North America · 392 vehicles