# Service bulletins for the 2026 Kenworth T880 A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned. 47 bulletins from NHTSA, as of 2026-10-19. - [42\-070](/bulletins/11038569.md), 2026-10-17, Service bulletin: UNKNOWN OR OTHER. Due to supplier constraints, an authorized aftermarket surge tank has been made available. - [P001](/bulletins/11037541.md), 2026-09-29, Service bulletin: ENGINE. "Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes. 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." - [E328](/bulletins/11037480.md), 2026-09-23, Service campaign: ELECTRICAL SYSTEM. Certain chassis with CARB 2024 compliant MX\-13 engines must have the PEU wiring harnesses updated. The original wiring and fuse are insufficient for electrical system operation and protection. - [01\-094](/bulletins/11037479.md), 2026-09-23, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. \[SmartAir / KIMS\] A/C systems may shut down prematurely when voltage levels drop below a certain threshold. - [E343](/bulletins/11037451.md), 2026-09-23, Service bulletin: ENGINE. An exhaust manifold slip joint seal kit is now available for EPA 2017\-2024 PACCAR MX\-13 engines. - [P001](/bulletins/11037449.md), 2026-09-23, Service bulletin: ENGINE. "KW: The chassis list has been updated to include 1 chassis. The total chassis count is now 53. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 8 chassis. The total chassis count is now 130. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section." - [P001](/bulletins/11036426.md), 2026-08-27, Service bulletin: ENGINE. "KW: The chassis list has been updated to include 1 chassis. The total chassis count is now 53. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 8 chassis. The total chassis count is now 130. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section." - [43\-089](/bulletins/11036342.md), 2026-08-25, Service bulletin: ENGINE. This optional software update is expected to be available after 08/28/2026. - [P001](/bulletins/11036339.md), 2026-08-25, Service bulletin: ENGINE. "PB: The chassis list has been updated to include 11 chassis. The total chassis count is now 122. KW: The chassis list has been updated to include 3 chassis. The total chassis count is now 52." - [P001](/bulletins/11036297.md), 2026-08-20, Service bulletin: ENGINE. "KW \-The chassis list has been updated to include 2 chassis. Total chassis count is now 49. PB \- The chassis list has been updated to include10 chassis. The total chassis count is now 111." - [24KWC/24PBC](/bulletins/11036296.md), 2026-08-20, Service bulletin: STEERING. Updated Sheppard Steering Gear Classification Tool link in Inspection Procedure - [43\-089](/bulletins/11036293.md), 2026-08-20, Service bulletin: ENGINE. This optional software update is expected to be available in late August 2026 for chassis equipped with EPA 2024 EMY 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. - [43\-089](/bulletins/11036292.md), 2026-08-20, Service bulletin: ENGINE. This optional software update is expected to be available in late August 2026 for chassis equipped with EPA 2024 EMY 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. - [46\-029](/bulletins/11036290.md), 2026-08-20, Service bulletin: ELECTRICAL SYSTEM. When DAVIE version 26.21.2 is used to update the VECU3 to software version 3.4.46.0, the VECU3 5071 component group may display as \-\-\- after programming. - [14\-037](/bulletins/11036288.md), 2026-08-20, Service campaign: UNKNOWN OR OTHER. An improved transmission bracket is now available for replacement on certain chassis equipped with a PACCAR TX\-12 transmission, featuring a more durable design for enhanced long\-term performance. - [43\-089](/bulletins/11035433.md), 2026-08-01, Service bulletin: ENGINE. 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. 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. - [43\-089](/bulletins/11035151.md), 2026-07-22, Service bulletin: ENGINE; ELECTRICAL SYSTEM. An optional software update is expected to be available on or after 07/31/26 for chassis equipped with EPA 2024 engine model year \(EMY\) 2024\-2026 PACCAR MX\-11 and MX\-13 engines. 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. - [41\-029](/bulletins/11035149.md), 2026-07-22, Service bulletin: ENGINE. Incorrect air filters may be inadvertently installed in certain chassis equipped with under\-hood Donaldson air filter housings. - [99\-052](/bulletins/11035095.md), 2026-07-20, Service bulletin: UNKNOWN OR OTHER. There is an update to the Base Emissions Warranty Limits table \[PR1.1\]and general certification information in certain Engine Model Year \(EMY\) 2026 MX\-11 and MX\-13 Operator’s Manuals. - [P001](/bulletins/11034397.md), 2026-07-02, Service campaign: ENGINE. Leveraging PACCAR’s advanced Prognostic prediction algorithms, certain PACCAR MX\-11 and MX\-13 EMY 2024\-2026 engines will receive proactive replacement instructions for the PM sensor to maximize uptime and maintain optimal performance. - [T024](/bulletins/11033925.md), 2026-06-17, Service bulletin: POWER TRAIN. "KW \& PB: New software is available for download. The DAVIE4 cache must be cleared before attempting to reprogram a chassis that is experiencing problems to ensure the latest version of software is installed. Follow all steps in the attached procedures before submitting a TCS case." - [T\-024](/bulletins/11033923.md), 2026-06-17, Service bulletin: POWER TRAIN. The repair procedure has been updated to include diagnostic steps. - [46\-027](/bulletins/11033920.md), 2026-06-17, Service bulletin: ELECTRICAL SYSTEM. The currently published HD BEV Chassis with PACCAR EPowertrain Service \(Built After 1/14/2026\) de\-energizing Procedures on ServiceNet cannot be utilized for certain pre\-production Battery Electric Vehicle \(BEV\) chassis. - [27\-012](/bulletins/11033917.md), 2026-06-17, Service bulletin: POWER TRAIN. The attachment for Eaton bulletin TAIB\-1015 has been updated to the latest version to improve process flow. - [R2601](/bulletins/11033387.md), 2026-06-04, Service bulletin: ELECTRICAL SYSTEM. Updated primary and/or secondary chassis modules for certain pre\-production Kenworth chassis are now available for installation. 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