Exterior lighting: lighting control moduleRecall 25V-622 · 2025–2026 Mack Pioneer PR (4)
Mack Trucks, Inc. recall 25V-622 covers 156 2025–2026 Mack Pioneer PR (4) for a exterior lighting: lighting control module problem, reported to NHTSA on September 18, 2025. The manufacturer's latest report (2026 Q3) shows 95% of affected vehicles repaired.
Source: NHTSA recall 25V622000 and manufacturer quarterly reports. Started by an NHTSA defect investigation.
The problem
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.
The 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.
The fix
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.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.
How fast cars are being fixed
95%repaired
Share of affected vehicles repaired in each quarterly report the manufacturer filed with NHTSA.
Vehicles in this recall
Built from October 22, 2024 to September 5, 2025. Not every vehicle in these model years is included; check by VIN.