2020 Kenworth W990 technical service bulletins

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

• Apr 17, 2026 Warranty extensionKw & pb DEF
• Nov 4, 2026 Service bulletinThe new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
• Oct 30, 2026 Service bulletinCertain chassis equipped with an engine model year 2019
• Oct 30, 2026 Service bulletinThis optional software update is expected to be available after 10/30/2026 for chassis equipped with EMY...
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Sep 5, 2026 Service bulletinAn exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
• Aug 13, 2026 Service bulletinThe procedure has been updated to include additional steps for verifying the software level on the vehicle...
• Jul 21, 2026 Service bulletinThis optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and...
• Jul 18, 2026 Service bulletinIncorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson...
• Jul 10, 2026 Service bulletinThe Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
• Jul 7, 2026 Service bulletinThe software is not yet available
• Jul 3, 2026 Service bulletinUpdated Eaton's TAIB0885EN Bulletin link.
• Jun 29, 2026 Service bulletinAn optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR...
• Jun 6, 2026 Service bulletinThe PACCAR Powertrain Prognostics Webcast video link has been removed
• May 18, 2026 Service bulletinKenworth
• May 6, 2026 Service bulletinTroubleshooting procedures for 2.1m cab power windows are now available.
• May 1, 2026 Service bulletinProcedures have been updated to include additional truck models in the service intervals table.
• 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
• Apr 1, 2026 EmissionsEPA17-24 mx
• Mar 11, 2026 Service bulletinEngine Air Filter Servicing UPDATE
• Mar 6, 2026 EmissionsEPA17-24 MX-13
• Aug 30, 2023 Service bulletinCertain W990 chassis may have hood hardware that could loosen
• Aug 30, 2023 Service bulletinCertain W990 hood-mounted engine air intake covers could loosen and rattle or separate from vehicle
• Jun 2, 2023 Service bulletinCertain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins...
• Feb 24, 2023 Service bulletinCertain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual...
• Jan 12, 2023 Service bulletinThis campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken...
• 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...
• 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...
• Jan 10, 2022 Service bulletinRetrofit
• 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
• Jun 14, 2021 Service bulletinInformation Only – C hassis equipped with MY2021 B EPA emission s standards will be shipped through...
• Feb 25, 2021 Service bulletinNon-Safety Campaign – The batteries may drain quickly due to the VECU not going to sleep
• Feb 10, 2021 Service bulletinInformation Only – Windshield washer pumps have a high No Trouble Found rate
• Oct 12, 2020 Service bulletinFix-As-Fail – The Battery Management System (BMS) may report the incorrect battery condition
• Oct 9, 2020 Service bulletinPower train
• Sep 25, 2020 Service bulletinInformation only: In 2020, Peterbilt and Kenworth began using the same M10, M12, M16, and M20 frame...
• Aug 26, 2020 Service bulletinFix-As-Fail – The Master Switch Module (MSM) may lose dash switch memory and functionality when the...
• Jul 21, 2020 Service bulletinNon-Safety Campaign – The end cap welds on certain fuel tanks may not meet internal quality standards due...
• Jun 8, 2020 Service bulletinInformation Only:
• Mar 17, 2020 Service bulletinInformation Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment...
• Feb 26, 2020 Service bulletinFix-As-Fail: The seal on T680, T880, and W990 windshields may be delaminated
• Jan 31, 2020 Service bulletinInformation Only
• Jan 3, 2020 Service bulletinInformation Only: The AutoStart System Test does not recognize the hood opening and closing when running...
• Dec 18, 2019 Service bulletinInformation Only
• Dec 10, 2019 Service bulletinThis bulletin has been obsoleted and replaced by Safety Recall 19KWE.
• Nov 27, 2019 Service bulletinFix As Fail-Shudder sensation near the governed vehicle speed when using cruise control due to excessive...
• Nov 6, 2019 Service bulletinInformation Only:
• Sep 27, 2019 Service bulletinInformation Only –
• Aug 23, 2019 Service bulletinFix-As-Fail: Two separate causes have been identified as root
• Apr 8, 2019 Service bulletinInformation Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
• Dec 5, 2018 Service bulletinFix-As-Fail: Vehicles equipped with VECU may activate frequently when LVD is enabled