2020 Kenworth T370 Recall: Vehicles may be missing a second R12 relay valve, causing increased brake…
NHTSA campaign 20V086000 · Service Brakes, Hydraulic · filed Feb 14, 2020 · verified Jul 30, 2026
The defect
PACCAR Incorporated (PACCAR) is recalling certain 2020 Kenworth T370 long wheelbase vehicles with larger rear axle spacing. The vehicles may be missing a second R12 relay valve, causing increased brake activation timing. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 121, "Air Brake Systems."
The risk
Increased brake activation timing may lengthen vehicle stopping distance, 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 Kenworth dealers will install a second R12 relay valve, free of charge. PACCAR issued owners an interim notification on April 14, 2020. The recall began May 6, 2020. Owners may contact Kenworth customer service at 1-425-828-5888. PACCAR's number for this recall is 20KWA.
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 Kenworth T370 recalls
- 2024–2025 Kenworth C500B and 22 other models — Please see the recall report for a complete list of models
- 2009–2021 Kenworth C500 and 9 other models — Air tanks have an insufficient volume of air for the brake…
- 2023 Kenworth T370 and 10 other models — Tie rod clamps may have been improperly heat-treated…
- 2022–2023 Kenworth C500 and 26 other models — Steering gears may have been assembled incorrectly, which…
- 2018–2020 Kenworth T270 and 18 other models — Dana D-Series axle steer arm fasteners that attach the…
Other campaigns involving Kenworth vehicles
Source: NHTSA recall database, campaign 20V086000 (manufacturer number 20KWA). Data last verified Jul 30, 2026.