# Mack Trucks, Inc.: Software Calculation Error May Cause Reduced Braking Performance (26V620000)

**Recall Urgency Score:** 35/100

| Field | Value |
|---|---|
| Manufacturer | Mack Trucks, Inc. |
| Subject | Software Calculation Error May Cause Reduced Braking Performance |
| NHTSA ID | 26V620000 |
| Manufacturer campaign | SC0500 |
| Recall type | Vehicle |
| Component | SERVICE BRAKES, ELECTRIC |
| Units potentially affected | 850 |
| Do not drive | No |
| Park outside | No |
| 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. |
| 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. |

## Why this score
- Safety-critical component (service brakes).
- 850 units affected.

Source: U.S. National Highway Traffic Safety Administration (NHTSA) recalls, via data.transportation.gov (https://www.nhtsa.gov/recalls?nhtsaId=26V620000). Last refreshed: 2026-11-03T18:08:10.172Z.
Recall data comes from NHTSA and is summarized automatically; check the official notice and VIN lookup before acting. Informational only.