Peterbilt 579 (2020) Recall: Unintended Movement Risk
PACCAR recalls 2020 Peterbilt 579 trucks with service brakes that may unintentionally disengage during winching, risking vehicle movement and crashes.
Use caution until it’s fixed
Unintended vehicle movement can increase the risk of a crash or injury.
Contact the company
What happened, in plain English
PACCAR is recalling 2020 Peterbilt 579 trucks because their service brakes can unintentionally disengage during winching, potentially causing the vehicle to roll. This could lead to crashes or injuries if the vehicle moves unexpectedly while being winched. Read more at govinfonow.com/recall/79954-peterbilt-579-2020-recall-unintended-movement-risk.
Source Summary by GovInfoNow · govinfonow.com/recall/79954-peterbilt-579-2020-recall-unintended-movement-risk · Updated October 4, 2026 · Official notice: NHTSA #21V906000
Cite this page
“Peterbilt 579 (2020) Recall: Unintended Movement Risk.” GovInfoNow, updated October 4, 2026. https://govinfonow.com/recall/79954-peterbilt-579-2020-recall-unintended-movement-risk. Based on NHTSA recall #21V906000 (https://www.nhtsa.gov/recalls?nhtsaId=21V906000).
Why it’s dangerous
During winching operations, the service brakes may unintentionally disengage. This can cause the vehicle to roll unexpectedly, increasing crash risk if the vehicle moves while being winched.
Who’s affected
Owners of 2020 Peterbilt 579 trucks are affected. Drivers using these vehicles for winching operations are at higher risk of vehicle movement.
How to tell if you have this one
Check for 2020 Peterbilt 579 trucks. The recall covers vehicles with PACCAR recall numbers 21KWG or 21PBM.
- Brand
Peterbilt- Category
Vehicle
What to do — step by step
Update Vehicle Software
Dealers will update the vehicle software for free to fix the service brake issue.
Contact Customer Service
Call PACCAR customer service at 1-425-828-5888 (Kenworth) or 1-940-591-4220 (Peterbilt) for assistance.
What NHTSA says to do
Dealers will update the vehicle software, free of charge. Owner notification letters were mailed on January 3, 2022. Owners may contact PACCAR customer service at 1-425-828-5888 (Kenworth); or 1-940-591-4220 (Peterbilt). PACCAR's numbers for this recall are 21KWG and 21PBM.
How this recall unfolded
Recall timeline
Owners were mailed letters 45 days after NHTSA received the defect report.
- NHTSA received the defect report
- Owner letters mailed
Dates from the agency record only; steps without a date are left out.
Contact Peterbilt
We’ve drafted a message you can send Peterbilt to request your refund or repair — edit it as you like.
Subject: Recall 21V906000 — Peterbilt 579 (2020) Recall: Unintended Movement Risk Hello, I own a Peterbilt 579 (2020) Recall: Unintended Movement Risk that is covered by recall 21V906000 from Peterbilt. The official recall notice states: Dealers will update the vehicle software, free of charge. Owner notification letters were mailed on January 3, 2022. Owners may contact PACCAR customer service at 1-425-828-5888 (Kenworth); or 1-940-591-4220 (Peterbilt). PACCAR's numbers for this recall are 21KWG and 21PBM. 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 #21V906000 (November 19, 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.