2027 Mack Pioneer PR (4) recalls (5)

Every 2027 Mack Pioneer PR (4) recall

Each campaign as NHTSA published it: what is wrong, what can happen, and the fix. Newest first.

• Structure · NHTSA 26V631000

  Oct 1, 2026Structure:Body:Bumpers:Active Shutters/Grill

  Problem

  Mack Trucks, Inc. (Mack) is recalling certain 2026-2027 Anthem AN (4) and 2025-2027 Pioneer PR (4) vehicles. The intake and grille bezels may detach from the vehicle.

  Risk

  A detached bezel can become a road hazard for other vehicles, increasing the risk of a crash.

  Fix

  Dealers will inspect, replace the intake and grille bezels, and install cable ties as necessary, free of charge. Owner notification letters are expected to be mailed November 30, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0501. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov on October 8, 2026.

  Full recall details for 26V631000 →

• Service Brakes, Electric · NHTSA 26V620000

  Sep 28, 2026Service Brakes, Electric:Software/Programming

  Problem

  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.

  Risk

  Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.

  Fix

  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.

  Full recall details for 26V620000 →

• Wheels · NHTSA 26V351000

  May 28, 2026Wheels:Lugs/Nuts/Bolts/StudsDo not drive

  Problem

  Mack Trucks, Inc. (Mack) is recalling certain 2026 Anthem (AN), 2026-2027 Pioneer PR (4), Pinnacle (PI/PN), Granite (GR), and 2027 Anthem AN (4) vehicles. The wheel lug nuts may loosen and allow the wheel to detach.

  Risk

  Wheel detachment can cause a loss of vehicle control or create a road hazard, increasing the risk of a crash or injury.

  Fix

  Owners are advised not to drive their vehicles until the repair has been performed. Dealers will inspect the wheel and hub mating surfaces, remove any masking material, and replace any worn components if necessary, free of charge. Owner notification letters were mailed June 22, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0495. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on May 31, 2026.

  Full recall details for 26V351000 →

• Service Brakes, Air · NHTSA 26V261000

  Apr 23, 2026Service Brakes, Air:Antilock:Control Unit/Module

  Problem

  Mack Trucks, Inc. (Mack) 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 and lead to a loss of the anti-lock brake system (ABS) and electronic stability control (ESC).

  Risk

  A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury.

  Fix

  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.

  Full recall details for 26V261000 →

• Exterior Lighting · NHTSA 26V207000

  Apr 1, 2026Exterior Lighting:Turn Signal

  Problem

  Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2027 Anthem (4) trailers. The trailer turn signals may not function properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."

  Risk

  Turn signals that do not function properly may fail to indicate the driver's intention to change vehicle direction, increasing the risk of a crash.

  Fix

  Dealers will update the turn signal indicator software, free of charge. Owner notification letters were mailed May 7, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0493. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov April 1, 2026.

  Full recall details for 26V207000 →

2027 Mack Pioneer PR (4) complaints and service bulletins

Mack has issued at least 42 technical service bulletins (repair instructions to dealers) for this model year. Complaints are unverified owner reports; a recall is the manufacturer’s admission of a safety defect.

Service bulletins by component

• Electrical System (30)
• Engine (5)
• Unknown Or Other (5)
• Power Train (3)
• Service Brakes (3)
• Seat Belts (2)

Read Mack Pioneer PR (4) owner complaints and bulletins, every year

Other Mack Pioneer PR (4) model years

← 2026 Mack Pioneer PR (4)

• 2027 (5)
• 2026 (9)
• 2025 (7)

All Mack Pioneer PR (4) recalls, every model year