Vehicle recall 26V620000 · September 28, 2026
Mack Anthem AN (4) and Pioneer PR (4)
Inaccurate axle load calculations may cause reduced braking performance while transporting smoothbore tanker trailers.
Source: NHTSA data as of November 8, 2026. Last refreshed Nov 8, 2026, 6:01 PM UTC.
- Summary
- 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.
- Remedy
- 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.
Recall details
- NHTSA campaign
- 26V620000
- Reported to NHTSA
- September 28, 2026
- Filed by
- Mack Trucks, Inc.
- Manufacturer campaign
- SC0500
- Vehicles potentially affected
- 850
- Initiated by
- the manufacturer
- Components
- Service brakes, electric › Software/programming
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Mack Anthem AN (4) (2026-2027): 2027, 2026
- Mack Pioneer PR (4) (2026-2027): 2027, 2026
Has your Mack been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.