2026 Kenworth W990 technical service bulletins
42 technical service bulletins and manufacturer communications cover the 2026 Kenworth W990.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- The new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
- Eaton service bulletin TAIB-1026 instructs dealers to update the master switch module (MSM) software
- The campaign expiration date has been extended from 01/01/2027 to 06/01/2027.
- Additional chassis have been added to the population
- 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.
- [SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold.
- KW: The chassis list has been updated to include 1 chassis
- This optional software update is expected to be available after 08/28/2026.
- PB: The chassis list has been updated to include 11 chassis
- This optional software update is expected to be available in late August 2026 for chassis equipped with...
- Updated Sheppard Steering Gear Classification Tool link in Inspection Procedure
- KW -The chassis list has been updated to include 2 chassis
- This optional software update is expected to be available on 08/07/26 for chassis equipped with EPA 2024...
- An optional software update is expected to be available on or after 07/31/26 for chassis equipped with EPA...
- Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson...
- An installation guide is now available for temporary solar battery maintainers used on vehicles in dealer...
- The battery care, maintenance, and charging guidelines have been updated to include Absorbent Glass Mat...
- There is an update to the Base Emissions Warranty Limits table [PR1.1]and general certification...
- Leveraging PACCAR’s advanced Prognostic prediction algorithms, certain PACCAR MX-11 and MX-13 EMY...
- Kw & pb
- The repair procedure has been updated to include diagnostic steps.
- Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now...
- KW: A Transmission Control Module (TCM) software update is now available for certain T280, T380, T480,...
- Troubleshooting procedures for 2.1m cab power windows are now available.
- (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
- Procedures have been updated to include additional truck models in the service intervals table.
- (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation
- The attached procedures document has been updated with more detail and explanations
- Bogie Crossmember Torque Value Update
- EMY21-25 ghg
- EPA17-24 mx
- Halogen Headlamp Operation -Activating the Flash to Pass system on certain [Kenworth / Peterbilt] vehicles may
- Exhaust Stack Isolators
- Engine Air Filter Servicing UPDATE
- EPA17-24 MX-13
- Vehicles equipped with Watson & Chalin 20K AL2200 lift axles may have crossmember fasteners of incorrect...
- Certain vehicle model year 2026 T880 / W900 / W990 chassis have updated GHG labels available for order and...
- Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control...
- A transmission control module (TCM) software update is now available for certain T680 / T880 / W900 / W990...
- Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and...
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