No complaints are listed for the 2025 Mack Pioneer PR (4). NHTSA's API and bulk file list none in this build.
Data build 2026-10-09.
NHTSA lists this vehicle as MACK PIONEER PR (4).
Model-generated complaint tags: No complaints are listed for tagging.
Recalls
See new recalls and investigations this week.
12 recalls. Showing the latest 10 of 12.
Date: 2026-10-01. Systems: STRUCTURE.
Defect: 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. (excerpt)
Consequence: A detached bezel can become a road hazard for other vehicles, increasing the risk of a crash. (excerpt)
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, (excerpt)
Do not drive: No. Park outside: No.
Date: 2026-04-23. Systems: SERVICE BRAKES, AIR.
Defect: 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). (excerpt)
Consequence: A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury. (excerpt)
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 searchab (excerpt)
Do not drive: No. Park outside: No.
Date: 2026-04-01. Systems: EXTERIOR LIGHTING.
Defect: 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: 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: 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.
Do not drive: No. Park outside: No.
Date: 2025-11-20. Systems: EXTERIOR LIGHTING.
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." (excerpt)
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. (excerpt)
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, (excerpt)
Do not drive: No. Park outside: No.
Date: 2025-11-20. Systems: EQUIPMENT.
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 recall will be searchable on NHTSA.gov beginning November 27, 2025.
Do not drive: No. Park outside: No.
Date: 2025-09-18. Systems: EXTERIOR LIGHTING.
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 will be searchable on NHTSA.gov beginning September 25, 2025.
Do not drive: No. Park outside: No.
Date: 2025-08-11. Systems: STEERING.
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 is SC0483.
Do not drive: No. Park outside: No.
Date: 2025-01-21. Systems: SERVICE BRAKES, AIR.
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.
Do not drive: No. Park outside: No.
Date: 2024-10-23. Systems: ELECTRICAL SYSTEM, SERVICE BRAKES, HYDRAULIC.
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.
Do not drive: No. Park outside: No.
Date: 2024-07-30. Systems: SEAT BELTS, SEATS.
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.
Do not drive: No. Park outside: No.
Manufacturer communications
155 manufacturer communications.
Communications by system| System | Count |
|---|
| ELECTRICAL SYSTEM | 75 |
|---|
| ENGINE | 33 |
|---|
| UNKNOWN OR OTHER | 15 |
|---|
| SERVICE BRAKES | 12 |
|---|
| POWER TRAIN | 11 |
|---|
| STRUCTURE | 10 |
|---|
| FUEL/PROPULSION SYSTEM | 8 |
|---|
| SUSPENSION | 5 |
|---|
11037728
Date: 2026-09-27. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
Power Cable Alternator Replacement
11037725
Date: 2026-09-24. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
Instrument Cluster Going Dark
11037668
Date: 2026-09-17. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
Diagnostic instructions for CAN network communication issues.
11037724
Date: 2026-09-08. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
11037821
Date: 2026-09-01. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
Jumper Harness Repair for Version 4 Mack Trucks
11036590
Date: 2026-08-26. Type: Service Bulletin/Repair Instructions. Systems: ENGINE.
Loose CCV mounting bolts and oil leak at CCV due to cracking of the housing. Mounting hardware found to be under-torqued after the vehicle was delivered.
11036589
Date: 2026-08-25. Type: Service Bulletin/Repair Instructions. Systems: SERVICE BRAKES.
The purpose of this CBR is to provide support for complaints of trailer braking aggressively.
11036583
Date: 2026-08-10. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM, STRUCTURE.
This CBR solution outlines the procedures for diagnosing, replacing, calibrating, and programming Flexible Switch Panels and the Security and Cab Interface Module (SCIM) to resolve switch malfunction notifications and associated fault codes.
11036585
Date: 2026-08-07. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM, ENGINE.
The purpose of this CBR is to provide steps on how to correct a customer complaint of a no crank/engine start condition.
11035510
Date: 2026-07-22. Type: Service Bulletin/Repair Instructions. Systems: SERVICE BRAKES.
TSB - Wheel Speed Sensor Fitting And Cable Clamping.