2025 Mack Pioneer PR (4)
Safety record from NHTSA: recalls, owner complaints, investigations and service bulletins.
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Vehicles › Mack › Pioneer PR (4) › 2025
These records cover every 2025 Mack Pioneer PR (4). To see whether one car still needs a recall repair, decode its VIN or check it with NHTSA.
Recalls
12 recalls name the 2025 Mack Pioneer PR (4). Newest first.
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.
Risk and remedy
Risk
A detached bezel can become a road hazard for other vehicles, increasing the risk of a crash.
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.
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).
Risk and remedy
Risk
A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury.
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.
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."
Risk and remedy
Risk
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.
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.
Risk and remedy
Risk
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.
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."
Risk and remedy
Risk
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. 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.
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.
Risk and remedy
Risk
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.
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.
Risk and remedy
Risk
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.
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."
Risk and remedy
Risk
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.
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.
Risk and remedy
Risk
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.
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.
Risk and remedy
Risk
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.
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.
Risk and remedy
Risk
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.
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.
Risk and remedy
Risk
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 customer service at 1-800-866-1177. Mack's number for this recall is SC0466.
Service bulletins
Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.
- 11010857Vehicles may present with oil leak coming from the clutch/flywheel housing and observation of burned clutch smell or clutch slipping. These symptoms can be mistaken as a crankshaft rear main seal leak, when the actual cause is the crankshaft adaptor O-ring.
- 11010820CBR - 11L Engine block compatibility and Backward Conversion Parts Requirements
- 11010819CBR - 13L Engine - Rear Main Oil Seal Leak Model Year 2025
- 11009712SERVICE CAMPAIGN - Pitman Arm Pinch Bolt Alignment
- 11009707CBR - One-Box SCR Weld Leaks.
- 11009706CBR - 13L Engine - Rear Main Oil Seal Leak - Model Year 2025
- 11009705CBR - Mack Chassis - Timing Gear Plate Repair
- 11008394Service Campaign: Interaxle Driveline Torque
- 11008382CBR: Vehicles Equipped With A Lift Axle - Wheel Speed Fault Code SPN 793, SPN 794 Set When Axle Is Up
- 11008380CBR: Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
- 11008377CBR: Automated Manual Transmission (AMT) Model D or F (mDrive and I-Shift, AMT-D, AMT-F) - Transmission Oil Leakage From Transmission Input Shaft Seal Or Output Shaft Seal - US10 And Newer Emissions, Common Model Years 2010 And Newer
- 11008368CBR: The procedure to eliminate the Mack Chassis "Air Restriction Light On" seen in the cluster is to confirm that the parameter YYT is set to "Enable" with Premium Tech Tool.
- 11008366CBR: To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP fi le will need to be downloaded.
- 11006925CBR: 11L, 13L, And 16L Engine Oil Analysis Specifications - US10 And Newer Emissions
- 11006924CBR: Overhead Wear Overview - Model Year2018 To Current (Common Rail Fuel System ONLY)
- 11006923CBR: Mack chassis with an mDRIVE transmission, there have been reports of complete shift assemblies and TECUs being replaced due to technicians being unable to pinpoint the source of the air leak.
- 11005416Service Campaign: Interaxle Driveline Torque
- 11005412CBR: Mack Chassis - Day Cab Glass Breakage
- 11005411CBR: Drivers Information Display (DID)Inoperative After Cluster Replacement And Programming
- 11005410CBR: Telematics Gateway (TGW) Connect Ability Issues
- 11005408CBR: Turbo Compound 2nd Generation - EGR And O r DPF Diagnostic Trouble Codes(DTC), Diagnostic And Repair Information
- 11005407CBR: Mack Anthem (AN) And Pinnacle (PI) -Bendix ABS Fault SPN 807 FMI 13 Blink code 19-4
- 11003045SC - Steering Stub Shaft Hardware Replacement
- 11003042CBR - Accelerator Pedal: Inspection Instructions
- 11003037CBR - Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
- 11003035CBR - Drivers Information Display (DID) Inoperative After Cluster Replacement And Programming
- 10253809CBR: Turbo Compound 2nd Generation - EGR And / Or DPF Diagnostic Trouble Codes (DTC), Diagnostic And Repair Information.
- 10253807CBR: Turbo Compound (TC) Hot Side Noise, Diagnostic Information.
- 10253804CBR: Equipped With An Automated Manual Transmission Model D or F ( AMT-D, AMT-F, mDrive) Missing X1 Value In VDA And Default Settings Guidelines, ParameterP1AOB; Fault Code P1052-54, Error 40,Or Error 18 Encountered During Clutch Or Tran.
- 10253781Service Campaign: Steering Stub Shaft Hardware Replacement
- 10252308CBR: Vehicles built with an 11 liter engine may experience a complaint of excessive fuel in the oil. It is possible that the source of the fuel is the rear fuel galley plug in the cylinder head.
Every Mack Pioneer PR (4) model year
Bars are owner complaints, dots mark years with recalls. Select a year to open its report.