Mack Pioneer Recall: Trailer Lights May Fail to Illuminate
Mack is recalling 2025-2026 Pioneer trucks because trailer lights may not work, increasing crash risk. Dealers will replace the module for free.
Use caution until it’s fixed
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 happened, in plain English
Mack Trucks is recalling certain 2025 and 2026 Pioneer vehicles due to a defect in the exterior lighting system. An improperly manufactured body control module can cause trailer tail lights and turn signals to fail when towing. This reduces visibility to other drivers and increases the risk of a crash. Read more at govinfonow.com/recall/1364727-mack-pioneer-recall-trailer-lights-may-fail-to-illuminate.
Source Summary by GovInfoNow · govinfonow.com/recall/1364727-mack-pioneer-recall-trailer-lights-may-fail-to-illuminate · Updated October 9, 2026 · Official notice: NHTSA #25V622000
Cite this page
“Mack Pioneer Recall: Trailer Lights May Fail to Illuminate.” GovInfoNow, updated October 9, 2026. https://govinfonow.com/recall/1364727-mack-pioneer-recall-trailer-lights-may-fail-to-illuminate. Based on NHTSA recall #25V622000 (https://www.nhtsa.gov/recalls?nhtsaId=25V622000).
Why it’s dangerous
The trailer lights may fail to illuminate because the body control module was manufactured incorrectly. When towing, this means other drivers cannot see your brake lights or turn signals, which can lead to collisions.
Who’s affected
Owners of certain 2025-2026 Mack Pioneer trucks who tow trailers are affected. Drivers are at increased risk of a crash if they rely on these lights for visibility while towing.
How to tell if you have this one
Check if you own a 2025-2026 Mack Pioneer vehicle. You will receive an owner letter mailed on November 19, 2025. Vehicle Identification Numbers (VINs) involved are searchable on NHTSA.gov starting September 25, 2025.
- Brand
Mack- Category
Vehicle
What to do — step by step
Wait for Notification
Mack will mail owner letters beginning November 19, 2025 to inform you of the recall.
Schedule Repair
Dealers will replace the trailer body input/output module free of charge once notified.
What NHTSA says 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.
How this recall unfolded
Recall timeline
Owners were mailed letters 2 months after NHTSA received the defect report.
- NHTSA received the defect report
- Owner letters mailed
- Added to GovInfoNow
Dates from the agency record only; steps without a date are left out.
Keep exploring
Where this comes from
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
- Official source: NHTSA Recall #25V622000 (September 18, 2025)
- Plain-language summary written by qwen3.6:35b-a3b on October 9, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
- GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.