2025 MACK PIONEER PR (4) — Problems, Recalls & Safety Data
N/A
Safety Rating
0
Owner Complaints
9
Recalls
33
Service Bulletins
0
Investigations
Overview of the 2025 MACK PIONEER PR (4)
The 2025 MACK PIONEER PR (4) has received a total of 0 safety complaints filed with the National Highway Traffic Safety Administration (NHTSA). There have been 13 recall campaigns affecting this vehicle, covering issues with EQUIPMENT:MECHANICAL, EXTERIOR LIGHTING:LIGHTING CONTROL MODULE. 33 technical service bulletins have been issued by Mack Trucks, Inc. for this model year.
Recalls for the 2025 MACK PIONEER PR (4)
NHTSA has recorded 13 recalls for the 2025 MACK PIONEER PR (4), potentially affecting up to 119,891 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 25V026000 — SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK
| 21 vehicles affected
Defect: 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: Insufficient air volume can reduce braking performance and increase the risk of a crash.
Remedy: 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.
View full details →Recall 24V792000 — ELECTRICAL SYSTEM:SOFTWARE
| 59,338 vehicles affected
Defect: 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: 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: 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.
View full details →Recall 24V792000 — SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
| 59,338 vehicles affected
Defect: 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: 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: 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.
View full details →Recall 24V567000 — SEATS:CRITICAL FASTENERS
| 242 vehicles affected
Defect: 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: 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: 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.
View full details →Recall 24V567000 — SEAT BELTS:CRITICAL FASTENERS
| 242 vehicles affected
Defect: 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: 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: 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.
View full details →Recall 24V504000 — STEERING:LINKAGES:TIE ROD ASSEMBLY
| 59 vehicles affected
Defect: 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: The ball stud can separate from the vehicle becoming a road hazard, increasing the risk of a crash.
Remedy: 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.
View full details →Recall 24V424000 — POWER TRAIN:AXLE ASSEMBLY
| 7 vehicles affected
Defect: 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: A sudden loss of steering control increases the risk of a crash.
Remedy: 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...
View full details →Recall 24V424000 — STEERING:LINKAGES:TIE ROD ASSEMBLY
| 7 vehicles affected
Defect: 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: A sudden loss of steering control increases the risk of a crash.
Remedy: 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...
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 2025 MACK PIONEER PR (4)
No complaints have been filed with NHTSA for the 2025 MACK PIONEER PR (4).
Safety Rating for the 2025 MACK PIONEER PR (4)
NHTSA has not yet tested the 2025 MACK PIONEER PR (4) in its New Car Assessment Program.
Technical Service Bulletins for the 2025 MACK PIONEER PR (4)
Mack Trucks, Inc. has issued 33 technical service bulletins (TSBs) for the 2025 MACK PIONEER PR (4). TSBs are notices sent by manufacturers to their dealers describing a known issue and the recommended repair procedure.
CBR 2443-3 202601 — ELECTRICAL SYSTEM
CBR - Trailer Tandem Adjustment Procedure - PR (4) - AN (4).
CBR 2496-9 202601 — ELECTRICAL SYSTEM
CBR - The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
CBR 2502-2 202601 — ELECTRICAL SYSTEM
CBR - Mack Chassis - Battery Sensor Diagnostic and Calibration Procedure - PR (4) - AN (4).
SC S4742 202601 — ENGINE
CBR MCO/VECI Label Reprint.
CBR 2540 202512 — UNKNOWN OR OTHER
Upper Bunk Restraint System – Plastic Gable Retention Field Fix
CBR 2496-5 202511 — ELECTRICAL SYSTEM
CBR - Mack Chassis - PR (4) - AN (4) - B2_T2_2.0.
CBR - 2528-1 202511 — UNKNOWN OR OTHER
CBR - Mack Chassis - PR (4) - Pioneer Bug Screen Hitting Bumper.
GDC25-003 092025 — FUEL/PROPULSION SYSTEM
Reductant Return: No Flow Detected
GDC25-004 092025 — FUEL/PROPULSION SYSTEM
Reductant Pressure Sensor - Circuit Open
GDC25-005 092025 — ENGINE
Exhaust Gas Temperature Sensor Circuit Short to Battery or Open
Showing 10 of 33 technical service bulletins.
NHTSA Investigations for the 2025 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) (current)
- 2026 MACK PIONEER PR (4) — 0 complaints
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