2026 MACK PIONEER PR (4) — Problems, Recalls & Safety Data
N/A
Safety Rating
0
Owner Complaints
4
Recalls
13
Service Bulletins
0
Investigations
Overview of the 2026 MACK PIONEER PR (4)
The 2026 MACK PIONEER PR (4) has received a total of 0 safety complaints filed with the National Highway Traffic Safety Administration (NHTSA). There have been 5 recall campaigns affecting this vehicle, covering issues with EQUIPMENT:MECHANICAL, EXTERIOR LIGHTING:LIGHTING CONTROL MODULE. 13 technical service bulletins have been issued by Mack Trucks, Inc. for this model year.
Recalls for the 2026 MACK PIONEER PR (4)
NHTSA has recorded 5 recalls for the 2026 MACK PIONEER PR (4), potentially affecting up to 637 vehicles.
Recall 25V801000 — EQUIPMENT:MECHANICAL
| 46 vehicles affected
Defect: 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: 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: 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...
View full details →Recall 25V622000 — EXTERIOR LIGHTING:LIGHTING CONTROL MODULE
| 156 vehicles affected
Defect: 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: 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: 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...
View full details →Recall 25V622000 — EXTERIOR LIGHTING:LIGHTING CONTROL MODULE
| 156 vehicles affected
Defect: 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: 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: 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...
View full details →Recall 25V521000 — STEERING
| 32 vehicles affected
Defect: 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: A loss of steering control increases the risk of a crash.
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...
View full details →Recall 25V803000 — EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
| 247 vehicles affected
Defect: 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: 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: 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. The final remedy is under development. Interim owner notification letters were mailed January 7, 2026. Additional letters...
View full details →Owner Complaints for the 2026 MACK PIONEER PR (4)
No complaints have been filed with NHTSA for the 2026 MACK PIONEER PR (4).
Safety Rating for the 2026 MACK PIONEER PR (4)
NHTSA has not yet tested the 2026 MACK PIONEER PR (4) in its New Car Assessment Program.
Technical Service Bulletins for the 2026 MACK PIONEER PR (4)
Mack Trucks, Inc. has issued 13 technical service bulletins (TSBs) for the 2026 MACK PIONEER PR (4). TSBs are notices sent by manufacturers to their dealers describing a known issue and the recommended repair procedure.
SC S4751 202601 — ELECTRICAL SYSTEM
CBR - Driver Environment Control Module Replacement.
CBR 2542 202512 — ELECTRICAL SYSTEM
This document provides mandatory interim parameter settings to ensure proper vehicle operation.
CBR 2526 202512 — ELECTRICAL SYSTEM
The purpose of this CBR is to address driver complaint of parking heater inoperative.
CBR 2535 202512 — ENGINE
The purpose of this CBR is to address reports of regeneration failure when ambient temperature is below 30F.
CBR 2016-18 202511 — UNKNOWN OR OTHER
CBR - Frame or Cab Lean.
GDC25-001 092025 — ENGINE
Particulate Filter Restriction - Soot Accumulation Bank 1
GDC25-002 092025 — FUEL/PROPULSION SYSTEM
Low Fuel Pressure
GDC25-009 092025 — ENGINE
Engine Oil Pressure Too Low
GDC25-010 092025 — ENGINE
Engine Coolant Level Low - Elevated Coolant & Oil Temperature
CBR 2504 092025 — UNKNOWN OR OTHER
Some vehicles may have reverse cameras not properly assigned from the factory.
Showing 10 of 13 technical service bulletins.
NHTSA Investigations for the 2026 MACK PIONEER PR (4)
There are no NHTSA defect investigations on record for this vehicle.
Other Model Years of the MACK PIONEER PR (4)
- 2025 MACK PIONEER PR (4) — 0 complaints
- 2026 MACK PIONEER PR (4) (current)
Other MACK Models
- MACK MACK — 35 total complaints
- MACK ANTHEM (AN) — 12 total complaints
- MACK CXU612 — 12 total complaints
- MACK CX613 — 10 total complaints
- MACK GRANITE (GR) — 10 total complaints
- MACK CH600 — 9 total complaints
- MACK GU — 9 total complaints
- MACK RD — 8 total complaints