2020–2021 Peterbilt 520 Recall: Stability control brake relay may have the Spring Brake Modulating (SBM)…
NHTSA campaign 20V739000 · Electronic Stability Control (esc) · filed Nov 25, 2020 · verified Jul 30, 2026
The defect
PACCAR Incorporated (PACCAR) is recalling certain 2020-2021 Peterbilt 520 vehicles. The stability control brake relay may have the Spring Brake Modulating (SBM) Valve or the lift axle hose incorrectly connected.
The risk
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.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — 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.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Affected vehicles
Related recalls
More Peterbilt 520 recalls
- 2026 Kenworth L770 and 1 other model — Right-hand stand-up (RHSU) configuration on the steering…
- 2025–2026 Kenworth L770 and 15 other models — Tail brake light, upper and lower beam headlights, reverse…
- 2021–2025 Kenworth T680 and 2 other models — High voltage (HV) contactors may open, causing a sudden…
- 2024–2025 Kenworth C500B and 22 other models — Please see the recall report for a complete list of models
- 2024 Kenworth T480 and 7 other models — Steering arm and/or tie rod bracket fasteners may fail…
Other campaigns involving Peterbilt vehicles
Source: NHTSA recall database, campaign 20V739000 (manufacturer number 20PBF). Data last verified Jul 30, 2026.