Mack Anthem (2020) Recall: Lane Drifting Risk
Mack is recalling 2018-2022 Anthem trucks with camelback suspension that may drift out of lane, risking crashes. Owners must contact Mack for free reprogramming by April 21, 2021.
Use caution until it’s fixed
A vehicle that drifts out of its lane increases the risk of a crash.
Contact the company
What happened, in plain English
Mack is recalling certain 2018-2022 Anthem trucks that may drift out of their lane at certain speeds, increasing crash risk. This affects vehicles with camelback rear suspension and electronic stability control systems. Read more at govinfonow.com/recall/79858-mack-anthem-2020-recall-lane-drifting-risk.
Source Summary by GovInfoNow · govinfonow.com/recall/79858-mack-anthem-2020-recall-lane-drifting-risk · Updated October 4, 2026 · Official notice: NHTSA #21V233000
Cite this page
“Mack Anthem (2020) Recall: Lane Drifting Risk.” GovInfoNow, updated October 4, 2026. https://govinfonow.com/recall/79858-mack-anthem-2020-recall-lane-drifting-risk. Based on NHTSA recall #21V233000 (https://www.nhtsa.gov/recalls?nhtsaId=21V233000).
Why it’s dangerous
The electronic stability control system may fail to keep the truck in its lane at certain speeds, causing the vehicle to drift. This violates federal safety standards for heavy vehicle stability systems.
Who’s affected
Truck owners with 2018-2022 Mack Anthem, Granite, or Pinnacle models equipped with camelback rear suspension. Drivers of these vehicles are most at risk during high-speed maneuvers.
How to tell if you have this one
Check if your truck has a camelback rear suspension and electronic stability control. The recall covers 2018-2022 Anthem, Granite, and Pinnacle models.
- Brand
Mack- Category
Vehicle
What to do — step by step
Contact Mack Customer Service
Call 1-800-866-1177 to schedule free reprogramming of the vehicle control units.
Get Reprogrammed
Dealers will reprogram the vehicle control units at no cost to fix the lane stability issue.
What NHTSA says to do
Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423.
How this recall unfolded
Recall timeline
2 dated steps over 4 months.
- NHTSA received the defect report
- Recall began
Dates from the agency record only; steps without a date are left out.
Contact Mack
We’ve drafted a message you can send Mack to request your refund or repair — edit it as you like.
Subject: Recall 21V233000 — Mack Anthem (2020) Recall: Lane Drifting Risk Hello, I own a Mack Anthem (2020) Recall: Lane Drifting Risk that is covered by recall 21V233000 from Mack. The official recall notice states: Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423. I’m writing to arrange the remedy described in the recall (a refund, repair, or replacement as applicable). Could you please tell me the next steps to resolve this? Thank you.
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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 #21V233000 (January 4, 2021)
- Plain-language summary written by qwen3:4b on October 4, 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.