US NHTSA records for Mack Pioneer Pr (4). Check the affected model years, then verify your exact vehicle with NHTSA.
Results are official records from named sources. Coverage is incomplete. Match the exact model, batch and market, and confirm the latest instructions with the official source. A missing result is not a safety clearance.
24V792Received 2024-10-23SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
Affected model years: 2025
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.
Official action: 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.
25V026Received 2025-01-21SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK
Affected model years: 2025
Insufficient air volume can reduce braking performance and increase the risk of a crash.
Official action: 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.
25V521Received 2025-08-11STEERING
Affected model years: 2025, 2026
A loss of steering control increases the risk of a crash.
Official action: 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.
25V622Received 2025-09-18EXTERIOR LIGHTING:LIGHTING CONTROL MODULE
Affected model years: 2025, 2026
Trailer tail lights and turn signals that do not illuminate as intended can reduce visibility to other drivers, increasing the risk of a crash.
Official action: 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.
25V801Received 2025-11-20EQUIPMENT:MECHANICAL
Affected model years: 2025, 2026
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.
Official action: 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.
25V803Received 2025-11-20EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
Affected model years: 2025, 2026
High beam headlights that do not switch to low beam as intended can reduce visibility for oncoming traffic, increasing the risk of a crash.
Official action: 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.
26V207Received 2026-04-01EXTERIOR LIGHTING:TURN SIGNAL
Affected model years: 2025, 2026, 2027
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.
Official action: 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.
26V261Received 2026-04-23SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
Affected model years: 2025, 2026, 2027
A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury.
Official action: 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.
26V351Received 2026-05-28WHEELS:LUGS/NUTS/BOLTS/STUDS
Affected model years: 2026, 2027
Wheel detachment can cause a loss of vehicle control or create a road hazard, increasing the risk of a crash or injury.
Official action: Owners are advised not to drive their vehicles until the repair has been performed. Dealers will inspect the wheel and hub mating surfaces, remove any masking material, and replace any worn components if necessary, free of charge. Owner notification letters were mailed June 22, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0495. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on May 31, 2026.
26V515Received 2026-08-06EXTERIOR LIGHTING
Affected model years: 2027
Marker lights that fail to illuminate can reduce visibility, increasing the risk of a crash.
Official action: Dealers will replace the center roof marker light, free of charge. Interim letters notifying owners of the safety risk were mailed September 22, 2026. Additional letters will be sent once the final remedy is available. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0498. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning August 13, 2026.
26V620Received 2026-09-28SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING
Affected model years: 2026, 2027
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
Official action: Dealers will install new software to disable the dynamic trailer braking calculations, free of charge. Owner notification letters are expected to be mailed November 27, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0500. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov on October 5, 2026.
26V631Received 2026-10-01STRUCTURE:EXTERIOR TRIM
Affected model years: 2025, 2026, 2027
A detached bezel can become a road hazard for other vehicles, increasing the risk of a crash.
Official action: 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.
Source snapshots: recall files 4 October 2026; complaint file 3 October 2026; investigation file 29 September 2026. Individually labelled archived records retain their older date.
