How many recalls does the 2026 Mack PIONEER PR (4) have?

NHTSA lists 9 recall campaigns for the 2026 Mack PIONEER PR (4) as of October 16, 2026. Each includes the defect description, safety consequence, and the remedy Mack will perform. New recalls can be issued at any time; this page is refreshed from NHTSA daily.

How do I tell if my 2026 Mack PIONEER PR (4) is affected by a recall?

Enter your 17-character VIN — stamped at the base of the windshield on the driver side and on the door jamb sticker — at nhtsa.gov/recalls. NHTSA's VIN lookup shows whether your specific vehicle has an unrepaired recall; the list on this page covers every campaign for the 2026 Mack PIONEER PR (4).

Are recall repairs on a 2026 Mack PIONEER PR (4) free?

Usually. Federal law requires Mack to remedy recalls on the 2026 PIONEER PR (4) free of charge at an authorized Mack dealer, regardless of how many owners the vehicle has had or how many miles are on the odometer — unless it was first sold more than 15 years before the recall was issued (5 years for tires).

Does a recall on the 2026 Mack PIONEER PR (4) affect resale value?

An open recall can reduce resale value; a recall that has been repaired (documented in the vehicle history report) generally does not. Before you buy or sell a used 2026 Mack PIONEER PR (4), check the VIN at nhtsa.gov/recalls to confirm every recall has been remedied.

How many owner complaints are on file for the 2026 Mack PIONEER PR (4)?

No owner complaints have been filed with NHTSA on the 2026 Mack PIONEER PR (4).

NHTSA vehicle safety data

2026 Mack PIONEER PR (4) Recalls, Ratings & Complaints

The 2026 Mack PIONEER PR (4) has 9 NHTSA recall campaigns and 0 owner complaints on file as of October 16, 2026. Recall repairs are usually free at an authorized Mack dealer.

NHTSA recall and complaint data for the 2026 Mack PIONEER PR (4). Recall data is refreshed daily from NHTSA.

Pre-purchase inspection checklist → Reliability & 5-year cost forecast →

STRUCTURE:EXTERIOR TRIM

NHTSA #26V631000

Reported October 1, 2026 · Mack Trucks, Inc.

Potentially affected: 3,096 vehicles

Defect description

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.

Safety consequence

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

Manufacturer remedy

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.

SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING

NHTSA #26V620000

Reported September 28, 2026 · Mack Trucks, Inc.

Potentially affected: 850 vehicles

Defect description

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.

Safety consequence

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

Manufacturer remedy

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.

WHEELS:LUGS/NUTS/BOLTS/STUDS

NHTSA #26V351000

Reported May 28, 2026 · Mack Trucks, Inc.

Potentially affected: 644 vehicles

DO NOT DRIVE — NHTSA has issued a park-it order on this recall. Contact a Mack dealer immediately.

Defect description

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.

Safety consequence

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

Manufacturer remedy

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.

SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

NHTSA #26V261000

Reported April 23, 2026 · Mack Trucks, Inc.

Potentially affected: 2,772 vehicles

Defect description

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).

Safety consequence

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

Manufacturer remedy

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.

EXTERIOR LIGHTING:TURN SIGNAL

NHTSA #26V207000

Reported April 1, 2026 · Mack Trucks, Inc.

Potentially affected: 86 vehicles

Defect description

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."

Safety consequence

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.

Manufacturer remedy

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.

EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE

NHTSA #25V803000

Reported November 20, 2025 · Mack Trucks, Inc.

Potentially affected: 247 vehicles

Defect description

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."

Safety consequence

High beam headlights that do not switch to low beam as intended can reduce visibility for oncoming traffic, increasing the risk of a crash.

Manufacturer remedy

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.

EQUIPMENT:MECHANICAL

NHTSA #25V801000

Reported November 20, 2025 · Mack Trucks, Inc.

Potentially affected: 46 vehicles

Defect description

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.

Safety consequence

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.

Manufacturer remedy

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.

EXTERIOR LIGHTING:LIGHTING CONTROL MODULE

NHTSA #25V622000

Reported September 18, 2025 · Mack Trucks, Inc.

Potentially affected: 156 vehicles

Defect description

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.

Safety consequence

Trailer tail lights and turn signals that do not illuminate as intended can reduce visibility to other drivers, increasing the risk of a crash.

Manufacturer remedy

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.

STEERING

NHTSA #25V521000

Reported August 11, 2025 · Mack Trucks, Inc.

Potentially affected: 32 vehicles

Defect description

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.

Safety consequence

A loss of steering control increases the risk of a crash.

Manufacturer remedy

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.

Other Mack PIONEER PR (4) model years

Check your 2026 Mack PIONEER PR (4) VIN

Not every recall applies to every VIN in a given year. Enter the 17-character VIN from your Mack PIONEER PR (4) at nhtsa.gov/recalls to see whether your specific vehicle has an unrepaired recall.

Check a Mack VIN