Software Calculation Error May Cause Reduced Braking Performance
Safety Recall
- Manufacturer
- Mack Trucks, Inc.
- Units affected
- 850
- Recall opened
- Sep 28, 2026
- Owner notification
- —
- Manufacturer campaign
- SC0500
- Type
- Vehicle
Affected vehicles (2)
- MACK ANTHEM AN (4)2026–2027
- MACK PIONEER PR (4)2026–2027
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.
Risk / 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.
Documents (2)
Source: NHTSA campaign 26V620000. Always confirm recall status and remedy availability with the manufacturer or a dealer using your VIN.