Mack Recalls 2026-2027 Pioneer PR and Anthem AN Trucks for Brake Software Issue
Mack is recalling certain 2026-2027 Pioneer PR and Anthem AN trucks due to reduced braking performance. Dealers will install new software free of charge.
Use caution until it’s fixed
Reduced braking performance can require a greater distance to stop, increasing the risk of a crash.
What happened, in plain English
Mack Trucks, Inc. is recalling certain 2026-2027 Anthem AN (4) and Pioneer PR (4) vehicles equipped with a tanker application package. The issue involves inaccurate axle load calculations that may cause reduced braking performance while transporting smoothbore tanker trailers. Read more at govinfonow.com/recall/1365088-mack-recalls-2026-2027-pioneer-pr-and-anthem-an-trucks.
Source Summary by GovInfoNow · govinfonow.com/recall/1365088-mack-recalls-2026-2027-pioneer-pr-and-anthem-an-trucks · Published October 9, 2026 · Updated October 9, 2026 · Official notice: NHTSA #26V620000
Cite this page
“Mack Recalls 2026-2027 Pioneer PR and Anthem AN Trucks for Brake Software Issue.” GovInfoNow, updated October 9, 2026. https://govinfonow.com/recall/1365088-mack-recalls-2026-2027-pioneer-pr-and-anthem-an-trucks. Based on NHTSA recall #26V620000 (https://www.nhtsa.gov/recalls?nhtsaId=26V620000).
Why it’s dangerous
Inaccurate axle load calculations can lead to reduced braking performance. This reduction may require a greater distance to stop, which increases the risk of a crash while the vehicle is in use.
Who’s affected
Owners of specific 2026-2027 Mack Anthem AN (4) and Pioneer PR (4) vehicles equipped with a tanker application package are affected. Drivers transporting smoothbore tanker trailers are most at risk due to the potential for increased stopping distances.
How to tell if you have this one
Check if your vehicle is a 2026-2027 Anthem AN (4) or Pioneer PR (4) model equipped with a tanker application package. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov on October 5, 2026.
- Brand
Mack- Category
Vehicle
What to do — step by step
Wait for Notification
Owner notification letters are expected to be mailed November 27, 2026.
Contact Dealer
Dealers will install new software to disable the dynamic trailer braking calculations free of charge.
Call Customer Service
Owners may contact Mack's customer service at 1-800-866-1177 for more information.
What NHTSA says to do
Dealers will install new software to disable the dynamic trailer braking calculations, free of charge. Owner notification letters are expected to be mailed November 27, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0500. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov on October 5, 2026.
How this recall unfolded
Recall timeline
GovInfoNow listed this recall 11 days after the agency date.
- NHTSA received the defect report
- Added to GovInfoNow
- Owner letters expected (expected, per the notice)
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 #26V620000 (September 28, 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.