Every 2025 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, 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 →Exterior Lighting · NHTSA 25V803000
Nov 20, 2025Exterior Lighting:Lighting Control Module:Software
- Problem
- Mack Trucks, Inc. (Mack) is recalling certain 2026 Anthem (4) and 2025-2026 Pioneer vehicles. The automatic high beams (AHB) may not switch to low beam headlights as intended. 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
- High beam headlights that do not switch to low beam as intended can reduce visibility for oncoming traffic, increasing the risk of a crash.
- Fix
- As an interim action, Mack will update the vehicle software through an over-the-air (OTA) update to disable the AHB feature, free of charge. Owner letters were mailed May 29, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0488. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning November 27, 2025.
Full recall details for 25V803000 →Equipment · NHTSA 25V801000
Nov 20, 2025Equipment:Mechanical
- Problem
- Mack Trucks, Inc. (Mack) is recalling certain 2025-2026 Pioneer vehicles. The load lock clamps, located on the back of the cab, may loosen and cause the load lock bars to become unsecured.
- Risk
- A loose or unsecured load lock bar can result in a loss of cargo, creating a road hazard and increasing the risk of a crash.
- Fix
- Dealers will replace the load lock clamps, free of charge. Owner notification letters were mailed December 18, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0489. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning November 27, 2025.
Full recall details for 25V801000 →Exterior Lighting · NHTSA 25V622000
Sep 18, 2025Exterior Lighting:Lighting Control Module
- Problem
- Mack Trucks, Inc. (Mack) is recalling certain 2025-2026 Pioneer vehicles. When towing a trailer, the trailer lights may fail to illuminate due to an improperly manufactured body control module.
- Risk
- Trailer tail lights and turn signals that do not illuminate as intended can reduce visibility to other drivers, increasing the risk of a crash.
- Fix
- Dealers will replace the trailer body input/output module, free of charge. Owner letters were mailed November 19, 2025. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0484.Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning September 25, 2025.
Full recall details for 25V622000 →Steering · NHTSA 25V521000
Aug 11, 2025Steering
- Problem
- Mack Trucks, Inc. (Mack) is recalling certain 2025 Anthem and 2025-2026 Pioneer vehicles. The dynamic steering and oversteer guidance feature may malfunction and cause a loss of steering control.
- Risk
- A loss of steering control increases the risk of a crash.
- Fix
- The oversteer guidance feature will be disabled through an over-the-air (OTA) update or by a dealer, free of charge. Owner notification letters were mailed August 21, 2025. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0483.
Full recall details for 25V521000 →
2025 Mack Pioneer PR (4) complaints and service bulletins
Mack has issued at least 155 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 (75)
- Engine (33)
- Unknown Or Other (15)
- Service Brakes (12)
- Power Train (11)
- Structure (10)
Read Mack Pioneer PR (4) owner complaints and bulletins, every year
Check your Pioneer PR (4) by VIN
Not every 2025 Mack Pioneer PR (4) is in every recall. Enter your 17-character VIN to see the recalls on record for your exact vehicle, then confirm which are still open at NHTSA.gov or with any Mack dealer.
Run a free VIN recall check →