The 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.
The risk
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
The 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.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Mack Anthem AN (4) | 2026, 2027 |
| Mack Pioneer PR (4) | 2026, 2027 |
Components: SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Mack Anthem AN (4) | 2026 | 0 | 4 |
| Mack Anthem AN (4) | 2027 | 0 | 6 |
| Mack Pioneer PR (4) | 2026 | 0 | 9 |
| Mack Pioneer PR (4) | 2027 | 0 | 6 |
Other service brakes, electric recalls in 2026
2 of the 666 recall campaigns reported to NHTSA in 2026 concerned the service brakes, electric; Mack Trucks, Inc. filed 118 campaigns in all.
| 26V619000 28 Sept 2026 | Volvo Trucks North America |
NHTSA recalls (public domain) · all recalls of 2026