NHTSA recall 26V620000 · Sep 28, 2026
Mack Trucks, Inc.: Software Calculation Error May Cause Reduced Braking Performance
Product
2026-2027 Anthem AN (4) and Pioneer PR (4) vehicles equipped with a tanker application package
Hazard
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
What to do
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.
Got a car, truck or motorcycle? The surest check is your 17-character VIN, which is on your registration, insurance card, or the driver-side dashboard. NHTSA's free lookup shows any open recall that hasn't been repaired on that exact vehicle.
Check my VIN on NHTSA.govRecall details
- 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.
- Component
- SERVICE BRAKES, ELECTRIC
- Recall type
- Vehicle
- Potentially affected
- 850
- Manufacturer campaign number
- SC0500
Source: National Highway Traffic Safety Administration (NHTSA) notice.
Copied from the agency record without changes. Data as of Oct 14, 2026, 12:58 AM EDT. The agency notice is the final word.
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