Mack Pioneer (4) Trailer Recall: Turn Signal Hazard
Mack recalls certain 2025-2027 Pioneer (4) trailers due to malfunctioning turn signals. Dealers will update software free of charge.
Use caution until it’s fixed
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.
What happened, in plain English
Mack Trucks, Inc. is recalling certain 2025-2027 Pioneer (4) and 2027 Anthem (4) trailers because the turn signals may not function properly. This defect prevents the trailer from indicating the driver's intention to change direction, which increases the risk of a crash. The vehicles fail to comply with Federal Motor Vehicle Safety Standard number 108. Read more at govinfonow.com/recall/1364728-mack-pioneer-4-trailer-recall-turn-signal-hazard.
Source Summary by GovInfoNow · govinfonow.com/recall/1364728-mack-pioneer-4-trailer-recall-turn-signal-hazard · Updated October 9, 2026 · Official notice: NHTSA #26V207000
Cite this page
“Mack Pioneer (4) Trailer Recall: Turn Signal Hazard.” GovInfoNow, updated October 9, 2026. https://govinfonow.com/recall/1364728-mack-pioneer-4-trailer-recall-turn-signal-hazard. Based on NHTSA recall #26V207000 (https://www.nhtsa.gov/recalls?nhtsaId=26V207000).
Why it’s dangerous
The trailer's turn signals may fail to operate correctly, meaning other drivers will not see when the vehicle intends to change direction. This lack of communication increases the likelihood of a crash during normal driving maneuvers.
Who’s affected
Owners of certain 2025-2027 Mack Pioneer (4) and 2027 Anthem (4) trailers are affected. Drivers towing these trailers are at risk because the turn signals may not indicate direction changes.
How to tell if you have this one
Check if you own a 2025-2027 Mack Pioneer (4) or a 2027 Anthem (4) trailer. You can verify if your specific vehicle is involved by searching its Vehicle Identification Number (VIN) on NHTSA.gov, where it became searchable on April 1, 2026.
- Brand
Mack- Category
Vehicle
What to do — step by step
Wait for Notification
Owner notification letters were mailed on May 7, 2026. Wait to receive this letter before taking action.
Contact Dealer
Take your trailer to a dealer who will update the turn signal indicator software free of charge.
Call Customer Service
If you have questions, contact Mack's customer service at 1-800-866-1177 and reference recall number SC0493.
What NHTSA says to do
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.
How this recall unfolded
Recall timeline
Owners were mailed letters 36 days 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.
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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 #26V207000 (April 1, 2026)
- 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.