2018 Kenworth T660 technical service bulletins

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

• Oct 28, 2026 Service bulletinReplaced obsolete SRT codes with updated SRT codes.
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Mar 21, 2026 EmissionsCARB Chassis Update
• Oct 28, 2025 Service bulletinSafety recall
• Apr 9, 2024 Service bulletinCertain C500/T440/T470/T660/T680/T800/T880/W900 chassis may have air tank reservoirs that do not meet air...
• Mar 1, 2024 Service bulletinSafety Recall Repair parts and procedures are now available
• Nov 28, 2023 Service bulletinSafety Recall Interim Notification On certain Kenworth model year 2018 through 2024 C500/T660/T800/W900...
• Jun 2, 2023 Service bulletinCertain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins...
• Oct 18, 2022 Service bulletinInfo Only
• Aug 3, 2022 Service bulletinKenworth is providing guidance for PACCAR MX Engine Composite Oil Pan leak troubleshooting to avoid...
• Sep 21, 2021 Service bulletinFix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
• Feb 10, 2021 Service bulletinInformation Only – Windshield washer pumps have a high No Trouble Found rate
• Dec 18, 2020 Service bulletinFix-As-Fail
• Jul 29, 2020 Service bulletinFix-As-Fail
• Jun 8, 2020 Service bulletinInformation Only:
• Mar 27, 2020 Service bulletinDEF tank covers may become loose and potentially crack on vehicles built before October 2019 with DEF tank...
• Mar 17, 2020 Service bulletinInformation Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment...
• Mar 3, 2020 Service bulletinInformation Only – Vehicles may have the connector seals on the wheel speed sensor incorrectly installed,...
• Dec 18, 2019 Service bulletinInformation Only
• Nov 6, 2019 Service bulletinInformation Only:
• Sep 27, 2019 Service bulletinInformation Only –
• Aug 28, 2019 Service bulletinFix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks
• Jul 22, 2019 Service bulletinFix as Fail: Vehicles with Eaton Ultrashift Plus or Fuller Advantage Automated transmissions may display...
• Jun 14, 2018 Service bulletinNon-Safety Campaign- Incorrect GHG emissions identifier label for the tire classification listed on...