- Vehicles
- 850
- Built between
- Feb 2025 – Sep 2026
- Models
- 2
- Recall type
- Vehicle
- Initiated by
- Manufacturer
- Owners notified
- Not yet
- Repaired
- Not reported
- Unrepaired
- Not reported
Does this affect my vehicle?
This recall covers vehicles built between February 2025 and September 2026. If yours was built outside that window, it is not part of this recall.
- 2026-2027 Mack Anthem AN (4)Built July 2025 to September 2026
- 2026-2027 Mack Pioneer PR (4)Built February 2025 to September 2026
What the defect is
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.
What could happen
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
What gets fixed
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.
Parts involved
- Msw26020191SOFTWARE
Part numbers are as filed by the manufacturer and are listed for reference. Your dealer will confirm the correct part for your vehicle.
Timeline
- Vehicles builtFebruary 2025 to September 2026
- Recall reported to NHTSA28 September 2026
No owner-notification date has been published yet. Manufacturers normally write to registered owners within 60 days of reporting a recall.
Your rights
A safety recall repair is free. Under US federal law the manufacturer must fix a safety defect at no cost to you — no charge for parts, labor or diagnosis — whether or not you are the original owner. A dealer cannot charge you for recall work, and cannot require you to have bought the vehicle from them.
That entitlement is not unlimited. It applies where the vehicle was first sold less than 15 years before the recall was announced — 5 years for tires. Past that a manufacturer may still do the repair free of charge, and many do, but they are no longer obliged to. This recall was reported on 28 September 2026.
To arrange the repair, contact any franchised dealer for the brand. If a dealer refuses the work or tries to charge for it, you can report that to NHTSA at nhtsa.gov/recalls or on 1-888-327-4236.
Manufacturer contact
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.
Official source
- Manufacturer's recall number
- SC0500
- Recalling manufacturer
- Mack Trucks, Inc.
- Recall initiated by
- MFR
Everything on this page — the models listed, the build dates and the repair figures — comes from the manufacturer's filing to NHTSA and describes the vehicle line as a whole, not any individual car. Only the manufacturer can confirm whether a specific vehicle is affected, and whether its recall work has already been carried out. Check yours by VIN and read the official notice at nhtsa.gov/recalls.
Check your own vehicle
This page describes the recall, not any one car. To see which recalls cover a specific vehicle, search by make, model and year.
A VIN lookup here identifies your vehicle and shows recalls issued for that make, model and year. It cannot tell you what is still open on your individual car - only the manufacturer knows that. Search by VIN instead, or check your VIN at nhtsa.gov for whether a recall is still open on your individual car.