2017 Kenworth T800 technical service bulletins

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

• Oct 13, 2026 Service bulletinDue to supplier constraints, an authorized aftermarket surge tank has been made available.
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Jul 10, 2026 Service bulletinThe Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
• Apr 17, 2026 Service bulletinThe attached procedures document has been updated with more detail and explanations
• Apr 16, 2026 Service bulletinBogie Crossmember Torque Value Update
• Mar 21, 2026 EmissionsCARB Chassis Update
• Jan 31, 2026 Service bulletinProcedure pictures updated for clarity
• 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 9, 2023 Service bulletinEmissions Recall Certain Vehicle Model Year 2017-2019 chassis equipped with EPA2017 compliant PACCAR MX-13...
• Jun 2, 2023 Service bulletinCertain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins...
• Jun 1, 2023 Service bulletinE279: paccar MX-13/MX-11
• 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...
• Jun 22, 2021 Service bulletinSafety Recall – Cummins Fuel Rail Leak – the federal safety agency ID: 21V391 / TC: 2021-323, Cummins...
• Jun 8, 2021 Service bulletinAn engine software update is required to resolve OBD system readiness, DEF doser diagnostics, and otherOBD...
• May 25, 2021 Service bulletinSelected engines have been identified to receive a camshaft inspection and an update for improved camshaft...
• 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 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 30, 2019 Service bulletinFix-As-Fail -“ C500, T440/T470, T800, W900 chassis HVAC Controllers may become unresponsive after...
• Aug 28, 2019 Service bulletinFix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks
• Jan 22, 2018 Service bulletinFix-As-Fail ? There is an updated plug to fix leaking steer axle hubcaps.
• Jan 9, 2018 Service bulletinCampaign ? The lower elbow of the exhaust system does not have a drain hole, allowing water to collect in...
• Jul 13, 2017 Service bulletinNon-safety Campaign: Some vehicles were equipped with a power fuse harness covered with an aluminum-faced...
• 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.