The 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.
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 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.
NHTSA's own wording · initiated by ODI
Vehicles covered
| Model | Model years |
|---|---|
| Mack Pioneer PR (4) | 2025, 2026 |
Components: EXTERIOR LIGHTING:LIGHTING CONTROL MODULE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Mack Pioneer PR (4) | 2025 | 0 | 12 |
| Mack Pioneer PR (4) | 2026 | 0 | 9 |
Other exterior lighting recalls in 2025
52 of the 891 recall campaigns reported to NHTSA in 2025 concerned the exterior lighting; Mack Trucks, Inc. filed 118 campaigns in all.
| 25V885000 18 Dec 2025 | Ford Motor Company |
| 25V890000 18 Dec 2025 | Altec Industries, Inc. |
| 25V845000 9 Dec 2025 | Chrysler (FCA US, LLC) |
| 25V831000 1 Dec 2025 | Ford Motor Company |
| 25V804000 20 Nov 2025 | Volvo Trucks North America |
| 25V803000 20 Nov 2025 | Mack Trucks, Inc. |
| 25V756000 3 Nov 2025 | Mack Trucks, Inc. |
| 25V757000 3 Nov 2025 | Volvo Trucks North America |
NHTSA recalls (public domain) · all recalls of 2025