2025 Kenworth W900B TSBs
12 Technical Service Bulletins across 4 categories
Software & Calibration
6 bulletinsThis optional software update is expected to be available after 08/28/2026.
The verbiage in the Introduction section has been updated.
The attachment for Eaton bulletin TAIB-1015 has been updated to the latest version to improve process flow.
(KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
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(PB) Certain Model 367 / 389 / 567 / 579 / 589 have updated GHG labels available for order and installation.
Bogie Crossmember Torque Value Update - Procedure has been updated to correct torque values.
Certain vehicle model years 2020-2025 K270, K370, T270, T280, T370, T380, T480, T680, T880, W900 chassis have updated...
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Greenhouse Gas (GHG) labels available for installation.
Engine
4 bulletinsThis optional software update is expected to be available in late August 2026 for chassis equipped with EPA 2024 EMY...
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2024-2026 PACCAR MX-11 and MX-13 engines. This bulletin will be updated when the software is ready. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance. The procedure document has also been updated for clarity.
This optional software update is expected to be available in late August 2026 for chassis equipped with EPA 2024 EMY...
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2024-2026 PACCAR MX-11 and MX-13 engines. This bulletin will be updated when the software is ready. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance. The procedure document has also been updated for clarity.
This optional software update is expected to be available on 08/07/26 for chassis equipped with EPA 2024 EMY 2024-2026 PACCAR MX-11 and MX-13 engines.
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This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.
Procedure pictures updated for clarity.
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When troubleshooting Cummins X15 fault codes 555 or 556, follow this additional testing, inspection, and documentation procedure to help identify the root cause of dusted engines. This is not a stand-alone process but must be used alongside Cummins troubleshooting steps. Cummins Quickserve will reference this bulletin for fault codes 555 or 556.
Other
1 bulletin"Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes.
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2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
Transmission
1 bulletinKW: A Transmission Control Module (TCM) software update is now available for certain T680, T880, and W990 chassis with...
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Eaton Endurant transmissions, TCM software version R5.5 or later and an AT5 controller, where the TASPS fails. Please see the Eaton bulletin TAIB-1015 in the Attachments section for details. PB: A Transmission Control Module (TCM) software update is now available for certain Model 567, 579, and 589 chassis with Eaton Endurant transmissions, TCM software version R5.5 or later and an AT5 controller, where the TASPS fails. Please see the Eaton bulletin TAIB-1015 in the Attachments section for details.