2021 Kenworth T370 technical service bulletins

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Aug 13, 2026 Service bulletinThe verbiage in the Introduction section has been updated.
• Apr 16, 2026 Service bulletinBogie Crossmember Torque Value Update
• Dec 31, 2025 Service bulletinCertain vehicle model years 2020-2025 K270, K370, T270, T280, T370, T380, T480, T680, T880, W900 chassis...
• Oct 28, 2025 Service bulletinSafety recall
• Oct 18, 2022 Service bulletinInfo Only
• May 10, 2022 Service bulletinSafety Recall – Interim Notification
• Dec 17, 2021 Service bulletinInformation Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines,...
• Sep 21, 2021 Service bulletinFix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
• Aug 6, 2021 Service bulletin​Safety Recall
• Jun 22, 2021 Service bulletinSafety Recall – Cummins Fuel Rail Leak – the federal safety agency ID: 21V391 / TC: 2021-323, Cummins...
• Feb 10, 2021 Service bulletinInformation Only – Windshield washer pumps have a high No Trouble Found rate
• Dec 18, 2020 Service bulletinFix-As-Fail
• Oct 12, 2020 Service bulletinFix-As-Fail – The Battery Management System (BMS) may report the incorrect battery condition
• Jul 2, 2020 Service bulletinNon-Safety Campaign – Some MY2020-2021 T370s may have had the front axle filled with the incorrect gear...