Skip to main content

NHTSA recall,

Mack Anthem AN and Pioneer PR Trucks

Mack Anthem and Pioneer vehicles have inaccurate axle load calculations that can reduce braking performance, increasing crash risk.

Summary by Recall Canary from the NHTSA notice

What happened

Mack Trucks, Inc. 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, which can require a greater distance to stop and increase the risk of a crash. The recall affects 850 vehicles nationwide.

The issue was reported to NHTSA on September 28, 2026. 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.

More brake defect recalls

What to do

If you own a vehicle in this recall:

  1. Check your VIN (vehicle identification number) at nhtsa.gov/recalls. VINs are searchable from October 5, 2026.
  2. Dealers will install new software to disable the dynamic trailer braking calculations, free of charge.
  3. Owner notification letters are expected to be mailed November 27, 2026. You 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.
  4. Watch your mail. Owner notification letters are expected to be mailed November 27, 2026.

What you get Free repair

Full text from NHTSA

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.

Is your Mack affected?

2 models

These models and years may be affected.

  • Anthem AN (4), model years 2026 to 2027
  • Pioneer PR (4), model years 2026 to 2027

Your VIN confirms it. Find the 17-character VIN on the driver's side of the dashboard or on your registration card.

Check your VIN on nhtsa.gov (opens in a new tab)

Recall details

Reported to NHTSA
Sold in
Nationwide
Manufacturer
Mack Trucks, Inc.
Component
Brake defect
Campaign
26V620000
Vehicles affected
850
Repair cost
Free of charge
Owner letters expected
Manufacturer's recall number
SC0500
Manufacturer phone
1-800-866-1177

All recalls from Mack Trucks, Inc.

Timeline

  1. Reported to NHTSA

  2. Listed on Recall Canary

  3. Summary updated

Other brake defect recalls

See all: Other brake defect recalls

Summary by Recall Canary, written with AI · summary updated Oct 4, 2026 · primary source: U.S. National Highway Traffic Safety Administration (opens in a new tab)