Recall Register

2025 Mack Pioneer PR (4): recalls and complaints

NHTSA advisory: do not driveCampaign 24V424000. NHTSA received the report on . 7 units. Power Train / Axle Assembly

Remedy of campaign 24V424000, in the NHTSA record

Owners are advised not to drive their vehicles until the remedy has been completed. Dealers will inspect and replace the tie rod ends as necessary, free of charge. Owner notification letters were mailed June 17, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0466.

Do-not-drive advisory: A mark on a recall campaign in the NHTSA recall file. This site shows the mark as NHTSA sets it.

NHTSA lists 11 recall campaigns for the 2025 Mack Pioneer PR (4). The newest campaign is 26V261000. NHTSA received the report on 23 Apr 2026. The NHTSA record gives the component Service Brakes, Air / Antilock / Control Unit/Module. NHTSA has no complaint on file for this model year.

This page cannot show if a recall applies to one vehicle. The NHTSA VIN lookup shows the unrepaired recalls of one vehicle.

Remedy of the newest campaign, 26V261000, in the NHTSA record

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.
NHTSA VIN lookup

Complaint information entered into NHTSA’s Office of Defects Investigation vehicle owner's complaint database is used with other data sources to identify safety issues that warrant investigation and to determine if a safety-related defect trend exists.

NHTSA publishes these words. Source: NHTSA Datasets and APIs, section Complaints, read on . Complaint file through . Recall file through .

Since the last update

No tracked figure of this page changed in a data update. What the log tracks

All updates to the register

Recall campaigns

11 campaigns, newest first. 63,006 units in total.

  • 26V261000Service Brakes, Air / Antilock / Control Unit/Module
  • 26V207000Exterior Lighting / Turn Signal
  • 25V801000Equipment / Mechanical
  • 25V803000Exterior Lighting / Lighting Control Module / Software
  • 25V622000Exterior Lighting / Lighting Control Module
  • 25V521000Steering
  • 25V026000Service Brakes, Air / Supply / Reservoir/Tank
  • 24V792000Service Brakes, Hydraulic / Antilock/Traction Control/Electronic Limited Slip / Control Unit/Module
  • 24V567000Seats / Critical Fasteners
  • 24V504000Steering / Linkages / Tie Rod Assembly
  • 24V424000Power Train / Axle AssemblyAdvisory

  1. 26V261000Received . 2,772 units.

    Service Brakes, Air / Antilock / Control Unit/Module

    Defect, in the NHTSA record
    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).
    Consequence, in the NHTSA record
    A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury.
    Remedy, in the NHTSA record
    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.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0494. Owner notification date in the NHTSA record: .

  2. 26V207000Received . 86 units.

    Exterior Lighting / Turn Signal

    Defect, in the NHTSA record
    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."
    Consequence, in the NHTSA record
    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.
    Remedy, in the NHTSA record
    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.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0493. Owner notification date in the NHTSA record: .

  3. 25V801000Received . 46 units.

    Equipment / Mechanical

    Defect, in the NHTSA record
    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.
    Consequence, in the NHTSA record
    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.
    Remedy, in the NHTSA record
    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.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0489. Owner notification date in the NHTSA record: .

  4. 25V803000Received . 247 units.

    Exterior Lighting / Lighting Control Module / Software

    Defect, in the NHTSA record
    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."
    Consequence, in the NHTSA record
    High beam headlights that do not switch to low beam as intended can reduce visibility for oncoming traffic, increasing the risk of a crash.
    Remedy, in the NHTSA record
    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.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0488. Owner notification date in the NHTSA record: .

  5. 25V622000Received . 156 units.

    Exterior Lighting / Lighting Control Module

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

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0484. Owner notification date in the NHTSA record: .

  6. 25V521000Received . 32 units.

    Steering

    Defect, in the NHTSA record
    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.
    Consequence, in the NHTSA record
    A loss of steering control increases the risk of a crash.
    Remedy, in the NHTSA record
    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.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0483. Owner notification date in the NHTSA record: .

  7. 25V026000Received . 21 units.

    Service Brakes, Air / Supply / Reservoir/Tank

    Defect, in the NHTSA record
    Mack Trucks, Inc. (Mack) is recalling certain 2024-2025 Pinnacle (PI/PN) trucks. The air tanks have an insufficient volume of air for the brake system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
    Consequence, in the NHTSA record
    Insufficient air volume can reduce braking performance and increase the risk of a crash.
    Remedy, in the NHTSA record
    Dealers will install the correct volume air tanks, free of charge. Owner notification letters were mailed February 10, 2025. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0473.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0473. Owner notification date in the NHTSA record: .

  8. 24V792000Received . 59,338 units.

    Service Brakes, Hydraulic / Antilock/Traction Control/Electronic Limited Slip / Control Unit/Module

    Defect, in the NHTSA record
    Mack Trucks, Inc. (Mack) is recalling certain 2020-2025 Anthem, Granite, TerraPro and Pinnacle vehicles, equipped with Bendix EC80 Advanced Electronic Control Units (ECU). Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop working.
    Consequence, in the NHTSA record
    Safety systems that depend on the ECU (Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collison Mitigation System) may have diminished or lost functionality, increasing the risk of a crash.
    Remedy, in the NHTSA record
    Dealers will reprogram the ECU software, free of charge. Owner notification letters were mailed December 9, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0472.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0472. Owner notification date in the NHTSA record: .

  9. 24V567000Received . 242 units.

    Seats / Critical Fasteners

    Defect, in the NHTSA record
    Mack Trucks, Inc. (Mack) is recalling certain 2024-2025 Anthem, Granite, and Pinnacle vehicles equipped with RollTek driver's seat assemblies. The seat pedestal and seat belt attachment may have been improperly tightened.
    Consequence, in the NHTSA record
    An improperly tightened seat pedestal and seat belt attachment may not restrain the occupant as intended, increasing their risk of injury during a crash.
    Remedy, in the NHTSA record
    Dealers will replace and tighten the seat pedestal and seat belt attachment bolts, free of charge. Owner notification letters were mailed September 16, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0469.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0469. Owner notification date in the NHTSA record: .

  10. 24V504000Received . 59 units.

    Steering / Linkages / Tie Rod Assembly

    Defect, in the NHTSA record
    Mack Trucks, Inc. (Mack) is recalling certain 2025 LR, Granite, and Pinnacle vehicles equipped with Composilite EXS20 steerable lift axle suspension assemblies. The tie rod assembly ball stud could have been improperly heat treated and can fail.
    Consequence, in the NHTSA record
    The ball stud can separate from the vehicle becoming a road hazard, increasing the risk of a crash.
    Remedy, in the NHTSA record
    Dealers will inspect and replace the tie rod end assemblies as necessary, free of charge. Owner notification letters were mailed July 15, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0468.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0468. Owner notification date in the NHTSA record: .

  11. 24V424000Received . 7 units.

    Power Train / Axle AssemblyDo-not-drive advisory

    Defect, in the NHTSA record
    Mack Trucks, Inc. (Mack) is recalling certain 2025 Anthem and Pinnacle trucks. The tie rod assemblies may contain an improperly heat-treated ball stud that can fail, resulting in a sudden loss of steering control.
    Consequence, in the NHTSA record
    A sudden loss of steering control increases the risk of a crash.
    Remedy, in the NHTSA record
    Owners are advised not to drive their vehicles until the remedy has been completed. Dealers will inspect and replace the tie rod ends as necessary, free of charge. Owner notification letters were mailed June 17, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0466.

    Report filed by Mack Trucks, Inc.. Manufacturer campaign number SC0466. Owner notification date in the NHTSA record: .

The campaign number opens the NHTSA record. Each quotation is the text of the NHTSA recall file.

Recall campaign: One recall in the NHTSA recall file, with one campaign number. A campaign can name many makes, models and model years.

Units: The number of vehicles or products that a recall can include. The manufacturer or the firm reports the number to the agency.

Complaints by component

The NHTSA complaint file has no complaint for this model year.

Investigations

The NHTSA investigation file has no investigation that names this model year.

Investigation: A study of a possible safety defect by the NHTSA Office of Defects Investigation. An investigation with no closing date in the NHTSA file is open.

Other model years

The number under each year is the number of recall campaigns.

  1. 202511
  2. 20268
  3. 20275

A year without a link has fewer than 2 campaigns and fewer than 25 complaints. It has no page.

Official channels

Cite this page

Recall Register. 2025 Mack Pioneer PR (4): recalls and complaints. https://recallregister.com/vehicle/mack/pioneer-pr-4/2025/. Source: NHTSA Office of Defects Investigation, recall, complaint and investigation files. Data through .

Sources

Source
NHTSA Office of Defects Investigation
Licence
US government work, public domain
Recall file through
30 Sep 2026
Complaint file through
30 Sep 2026
First complaint in the file
1 Jan 1995
Manufacturer in the recall file
Mack Trucks, Inc.

The NHTSA record is the authority. A complaint count is the number of different complaint numbers for the make, the model and the model year. How the register is made. Report an error.

Questions

How many units are in the recall campaigns for the 2025 Mack Pioneer PR (4)?
63,006 units in 11 campaigns. A campaign can name other models and model years, and its units include them.
How many recall campaigns does the Mack Pioneer PR (4) have for all model years?
NHTSA lists 14 recall campaigns for the Mack Pioneer PR (4), model years 2025 to 2027. 11 of them name the 2025 model year.
Is an NHTSA investigation of the 2025 Mack Pioneer PR (4) open?
The NHTSA investigation file has no investigation that names this model year.