2026 Kenworth L770 technical service bulletins

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

• Oct 28, 2026 Service bulletinThere is an update to the CARB Base Emissions Warranty Limits table and Manufacturer’s Warranty Coverage...
• Oct 23, 2026 Service bulletinEaton service bulletin TAIB-1026 instructs dealers to update the master switch module (MSM) software
• Oct 16, 2026 Service bulletinAdditional chassis have been added to the population
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Aug 21, 2026 Service bulletinThis optional software update is expected to be available after 08/28/2026.
• Aug 13, 2026 Service bulletinThis optional software update is expected to be available in late August 2026 for chassis equipped with...
• Aug 13, 2026 Service bulletinUpdated Sheppard Steering Gear Classification Tool link in Inspection Procedure
• Aug 1, 2026 Service bulletinThis optional software update is expected to be available on 08/07/26 for chassis equipped with EPA 2024...
• Jul 21, 2026 Service bulletinAn optional software update is expected to be available on or after 07/31/26 for chassis equipped with EPA...
• Jul 2, 2026 Service bulletinThere is an update to the Base Emissions Warranty Limits table [PR1.1]and general certification...
• May 20, 2026 Service bulletin​Updated cross shaft and bearing installation steps have been added to the repair procedures.
• Apr 1, 2026 EmissionsEPA17-24 mx
• Feb 28, 2026 Service campaignKW: ​Certain Kenworth L770 chassis may have Right-Hand (RH) steering cross shaft bearing mounting holes...
• Dec 23, 2025 Service bulletinParts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control...
• Aug 1, 2025 Service campaignProcedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and...