Peterbilt · United States · High
Peterbilt 579, 520: Electrical system — propulsion system
Affects Peterbilt 579, 520 · 2021–2025 — about 238 vehicles.
The hazard
A loss of drive power increases the risk of a crash.
What to do
Dealers will update the software and replace the electrical harness, free of charge. Owner notification letters were mailed May 13, 2025. Owners may contact Peterbilt's customer service at 1-940-591-4220 and Kenworth's customer service at 1-425-828-5888. PACCAR's numbers for this recall are 25PBC and 25KWC.
Critical — crash/injury risk now
High — injury risk; see remedy
Moderate — fix at next service
Low — minor / informational