PETERBILT 520 (2020) recall — Electronic Stability Control (Esc)
PACCAR recalls 2020-2021 Peterbilt 520 trucks with potential stability control issues that could increase crash risk. Owners must contact for free inspection.
Use caution until it’s fixed
A stability control event meant to only actuate the ABS controlled wheel ends could actuate lift axle brakes or modulate park brake chambers and could possibly de-stabilize the vehicle, increasing the risk of a crash.
Contact the company & request your remedy
What happened, in plain English
PACCAR is recalling certain 2020-2021 Peterbilt 520 trucks due to a stability control issue that could cause the vehicle to become unstable and crash. This affects truck owners who may need a free inspection to fix brake relay plumbing. Read more at govinfonow.com/recall/79949-peterbilt-520-2020-recall-stability-control-risk-of-crash.
Source Summary by GovInfoNow · govinfonow.com/recall/79949-peterbilt-520-2020-recall-stability-control-risk-of-crash · Updated October 4, 2026 · Official notice: NHTSA #20V739000
Cite this page
“Peterbilt 520 (2020) Recall: Stability Control Risk of Crash.” GovInfoNow, updated October 4, 2026. https://govinfonow.com/recall/79949-peterbilt-520-2020-recall-stability-control-risk-of-crash. Based on NHTSA recall #20V739000 (https://www.nhtsa.gov/recalls?nhtsaId=20V739000).
Why it’s dangerous
The stability control system may activate lift axle brakes or park brake chambers incorrectly, causing instability. This could lead to a crash if the vehicle becomes unbalanced during normal operation.
Who’s affected
Truck owners with 2020-2021 Peterbilt 520 models are most at risk. The hazard is specific to vehicles with improperly connected brake relays.
How to tell if you have this one
Check for 2020-2021 Peterbilt 520 trucks. The recall was issued for vehicles with improperly connected brake relays in the stability control system.
- Brand
Peterbilt- Category
Vehicle
What to do — step by step
Contact Customer Service
Call PACCAR at 1-940-591-4220 to get an inspection for free.
Get Free Inspection
Dealers will inspect the suspect chassis and correct brake relay plumbing if needed.
What NHTSA says to do
PACCAR will notify owners, and dealers will inspect the suspect chassis and correct the brake relay plumbing if needed, free of charge. PACCAR has issued owners an interim notification on January 4, 2020. Owner notification letters were mailed on January 25, 2021. Owners may contact Peterbilt customer service at 1-940-591-4220. PACCAR's number for this recall is 20PBF.
Questions people ask
Why is this recall happening?
The stability control brake relay may have the Spring Brake Modulating (SBM) Valve or lift axle hose incorrectly connected, increasing crash risk.
How do I know if my truck is affected?
Check if you own a 2020-2021 Peterbilt 520 with improperly connected brake relays in the stability control system.
What should I do if I have this truck?
Contact PACCAR at 1-940-591-4220 for a free inspection to fix brake relay plumbing if needed.
Contact Peterbilt
We’ve drafted a message you can send Peterbilt to request your refund or repair — edit it as you like.
Subject: Recall 20V739000 — Peterbilt Peterbilt Hello, I own a Peterbilt that is covered by recall 20V739000 from Peterbilt. The official recall notice states: PACCAR will notify owners, and dealers will inspect the suspect chassis and correct the brake relay plumbing if needed, free of charge. PACCAR has issued owners an interim notification on January 4, 2020. Owner notification letters were mailed on January 25, 2021. Owners may contact Peterbilt customer service at 1-940-591-4220. PACCAR's number for this recall is 20PBF. 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 #20V739000 (November 25, 2020)
- 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.