2016 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.

• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Mar 21, 2026 EmissionsCARB Chassis Update
• Apr 9, 2024 Service bulletinCertain C500/T440/T470/T660/T680/T800/T880/W900 chassis may have air tank reservoirs that do not meet air...
• Jun 2, 2023 Service bulletinCertain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins...
• 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
• Jun 10, 2019 Service bulletinFix as Fail: Vehicles built 11/30/15 to 7/18/16 may display an error message in the Service Advised...
• Jun 14, 2018 Service bulletinNon-Safety Campaign- Incorrect GHG emissions identifier label for the tire classification listed on...
• Mar 26, 2018 Service bulletinNon-Safety Campaign
• Jan 22, 2018 Service bulletinFix-As-Fail ? There is an updated plug to fix leaking steer axle hubcaps.
• Jul 28, 2016 Service bulletinFix-as-fail - engine over-speed lamp could come on after a downshift with the eaton ultrashift plus...
• Jul 28, 2016 Service bulletinEaton ultrashift plus excessive engine over-speed lamp on.
• Jul 7, 2016 Service bulletinFix-as-requested - nav+ hd software update for random reboot fix and MP3 features enabled.
• Jul 7, 2016 Service bulletinNav+HD MP3 reboot update ane features enable.
• May 31, 2016 Service bulletinNon-safety campaign - chassis built with pre-production qv/vv models of the nav+ hd system hardware are...