2026-2027 Mack Anthem AN (4), 2026-2027 Mack Pioneer PR (4) recall: Software Calculation Error May Cause Reduced Braking Performance
Report received by NHTSA: Sept. 28, 2026.
Built by the Tribune's code from NHTSA's official records. No AI wrote this page. Updated Nov. 4, 2026.
- What's recalled
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.
- Who's affected
850 vehicles potentially affected, according to NHTSA. Models: 2026-2027 Mack Anthem AN (4), 2026-2027 Mack Pioneer PR (4).
- Compared with
Mack Trucks, Inc. has 9 NHTSA recalls in 2026 so far, compared with 17 in all of 2025.
Counted by the Tribune from NHTSA's records since Nov. 1, 2016.
- Before this
85 earlier NHTSA recalls by Mack Trucks, Inc. since Nov. 1, 2016; the 5 most recent:
- Aug. 12, 2026 Mack Trucks, Inc. equipment recall: Marker Lights May Fail to Illuminate/FMVSS 108
- Aug. 6, 2026 2027 Mack Anthem AN (4), 2027 Mack Pioneer PR (4) recall: Marker Lights May Fail to Illuminate/FMVSS 108
- Aug. 6, 2026 2025 Mack Terrapro (te) recall: Steering Gearbox Fasteners May Loosen
- May 28, 2026 2026-2027 Mack Granite (gr), 2026-2027 Mack Pinnacle (pi/Pn), 2026-2027 Mack Pioneer PR (4) and 2 more models recall: Do Not Drive: Wheel May Detach
- April 23, 2026 2025-2027 Mack Pioneer PR (4), 2026-2027 Mack Anthem AN (4) recall: Rear Brake Modulators May Short Circuit (agency record)
Counted by the Tribune from NHTSA's records since Nov. 1, 2016.
- What to do and when
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 record, word for word
- Check it yourself
NHTSA's VIN lookup shows whether a specific vehicle has an open recall.
Models in this recall
- Mack Anthem AN (4) 2026-2027
- Mack Pioneer PR (4) 2026-2027
The record as NHTSA published it
| NHTSA recall number | 26V620000 |
|---|---|
| Manufacturer | Mack Trucks, Inc. |
| Recall type | Vehicle |
| Component | SERVICE BRAKES, ELECTRIC |
| Report received by NHTSA | Sept. 28, 2026 |
| Potentially affected | 850 vehicles |
| Manufacturer's recall number | SC0500 |
| “Do not drive” warning | No |
| Fire risk when parked (“park outside”) | No |
Source: National Highway Traffic Safety Administration recall records (public domain). NHTSA's record