Peterbilt 520: Electronic stability control (esc)

Affects Peterbilt 520 · 2020–2021 — about 11 vehicles.

The hazard

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.

What 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.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational