Mack Pioneer PR (4): Exterior lighting — lighting control module

Affects Mack Pioneer PR (4) · 2025–2026 — about 156 vehicles.

The hazard

Trailer tail lights and turn signals that do not illuminate as intended can reduce visibility to other drivers, increasing the risk of a crash.

What to do

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.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational