2021 Kenworth T440 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
• Oct 28, 2025 Service bulletinSafety recall
• Oct 18, 2022 Service bulletinInfo Only
• May 10, 2022 Service bulletinSafety Recall – Interim Notification
• Feb 4, 2022 Service bulletinDue to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet...
• Dec 17, 2021 Service bulletinInformation Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines,...
• Nov 16, 2021 Service bulletinNon-Safety Campaign
• Sep 21, 2021 Service bulletinFix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
• Sep 20, 2021 Service bulletinInformation Only
• 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...