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NHTSA recall,

Mack Anthem and Pioneer Trucks

Mack Pioneer and Anthem vehicles have rear brake modulators that may short circuit, increasing crash risk.

Summary by Recall Canary from the NHTSA notice

What happened

Mack Trucks, Inc. is recalling certain 2025-2027 Pioneer (4) and 2026-2027 Anthem (4) vehicles. The rear brake modulators may have unprotected electrical connectors that can short circuit, leading to a loss of the anti-lock brake system (ABS) and electronic stability control (ESC). This increases the risk of a crash or injury. The recall was reported to NHTSA on April 23, 2026, and affects 2,772 vehicles nationwide.

Dealers will inspect the rear brake modulator electrical connectors, install a protective cover, and replace the rear brake modulators as necessary, free of charge. Owner notification letters were mailed on June 8, 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 April 30, 2026.
  2. Dealers will inspect the rear brake modulator electrical connectors, install a protective cover, and replace the rear brake modulators, as necessary, free of charge.
  3. Owner notification letters were mailed June 8, 2026. You may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0494. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning April 30, 2026.
  4. Look for the owner letter. Owner notification letters were mailed June 8, 2026.

What you get Free repair

Full text from NHTSA

Dealers will inspect the rear brake modulator electrical connectors, install a protective cover, and replace the rear brake modulators, as necessary, free of charge. Owner notification letters were mailed June 8, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0494. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning April 30, 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 2025 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
26V261000
Vehicles affected
2,772
Repair cost
Free of charge
Owner letters mailed
Manufacturer's recall number
SC0494
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 3, 2026 · primary source: U.S. National Highway Traffic Safety Administration (opens in a new tab)