2021 Kenworth W990 technical service bulletins
56 technical service bulletins and manufacturer communications cover the 2021 Kenworth W990, including one warranty extension.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to...
- The new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
- Certain chassis equipped with an engine model year 2019
- This optional software update is expected to be available after 10/30/2026 for chassis equipped with EMY...
- Certain Kenworth EMY 2022 T680, T880 and W990 chassis may not contain an EAS operator’s manual in the...
- Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes
- An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
- The procedure has been updated to include additional steps for verifying the software level on the vehicle...
- The verbiage in the Introduction section has been updated.
- This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and...
- Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson...
- The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
- The software is not yet available
- An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR...
- The PACCAR Powertrain Prognostics Webcast video link has been removed
- KW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The...
- Kenworth
- Troubleshooting procedures for 2.1m cab power windows are now available.
- Procedures have been updated to include additional truck models in the service intervals table.
- The attached procedures document has been updated with more detail and explanations
- Bogie Crossmember Torque Value Update
- EPA17-24 mx
- Expiration Date Format Update
- Engine Air Filter Servicing UPDATE
- EPA17-24 MX-13
- The Parts section has been updated to clarify that freight charges for safety recall orders should not be...
- The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector
- Safety Recall – INTERIM NOTIFICATION Parts are not currently available for this safety recall
- Paccar MX-11 & MX-13 EPA2021
- Certain W990 chassis may have hood hardware that could loosen
- Certain W990 hood-mounted engine air intake covers could loosen and rattle or separate from vehicle
- Fix-as-fail
- Certain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins...
- PACCAR will reimburse customers for the local purchase of in-tank fuel additive for EPA2021 compliant MX...
- Certain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual...
- This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken...
- Info Only
- Kenworth is providing guidance for PACCAR MX Engine Composite Oil Pan leak troubleshooting to avoid...
- Safety Recall â Interim Notification
- Engine Model Year 2021B and later PACCAR MX-11 and MX-13 Fuel Injector Adjustment During First C Service
- Due to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet...
- Information Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines,...
- Non-Safety Campaign: Certain DC tools were incorrectly calibrated
- Fix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
- Information Only
- Safety Recall – Interim Notification
- Information Only – C hassis equipped with MY2021 B EPA emission s standards will be shipped through...
- Non-Safety Campaign – The batteries may drain quickly due to the VECU not going to sleep
- Information Only – Windshield washer pumps have a high No Trouble Found rate
- Fix-As-Fail – The Battery Management System (BMS) may report the incorrect battery condition
- Power train
- Information Only:
- Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment...
- Fix-As-Fail: The seal on T680, T880, and W990 windshields may be delaminated
- Information Only
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