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Service bulletin 43-076

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11027058
Published by NHTSA2026-01-06
Manufacturer's number43-076
Manufacturer's date2025-12-31
Campaign id or software version43-076
NHTSA componentFUEL/PROPULSION SYSTEM

NHTSA's summary

Certain vehicle model years 2020-2025 K270, K370, T270, T280, T370, T380, T480, T680, T880, W900 chassis have updated Greenhouse Gas (GHG) labels available for installation.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Fuel system

Vehicles listed
KENWORTH K2702022 to 2025
KENWORTH K3702022 to 2025
KENWORTH T2702020 to 2023
KENWORTH T2802021
KENWORTH T2802022, 2023, 2024, 2025
KENWORTH T3702020 to 2023
KENWORTH T3802020 to 2021
KENWORTH T3802022, 2023, 2024, 2025
KENWORTH T4802020 to 2021
KENWORTH T4802022, 2023, 2024, 2025
KENWORTH T6802020, 2021, 2022, 2023, 2024, 2025
KENWORTH T8802020, 2021, 2022, 2023, 2024, 2025
KENWORTH W9002020 to 2025
KENWORTH W900B2021 to 2025

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20246302024-10-23. Fuel System
24V7890002024-10-23. FUEL SYSTEM, DIESEL:DELIVERY:FUEL PUMP
20234952023-09-05. Fuel System
23V6170002023-09-05. FUEL SYSTEM, DIESEL:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
20224302022-08-04. Fuel System
22V5820002022-08-04. STRUCTURE: UNDERRIDE; FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY
20214802021-08-03. Fuel System
21V6010002021-08-03. FUEL SYSTEM, DIESEL:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
20213232021-05-26. Fuel System
21V3910002021-05-26. FUEL SYSTEM, DIESEL:FUEL INJECTION SYSTEM:FUEL RAIL

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
CE0372026-05-06. Warranty extension. KW & PB DEF Quality Sensor part number Q21-6127-001 for Cummins X15 engines has been added to this warranty policy.
R2405 - KW2025-05-06. Service bulletin. Due to parts availability, this bulletin will be divided into 2 phases. Phase 1 will bring affected chassis into emissions compliance before 06/30/2025 to avoid fines and penalties. Phase 2 will include all parts that are not currently available but are necessary to bring chassis up to production level. This bulletin will be updated once all Phase 2 parts become available. The emissions exemption for all chassis involved in this retrofit expires on 06/30/2025. After that date, all chassis that have not received this Phase 1 Retrofit will be out of compliance with emissions regulations and illegal to operate. NOTE If emissions exemptions are allowed to expire, vehicle owners could receive civil fines per regulation 40 CFR 19.4 up to $5,911 per engine. In addition, owners may be required to discontinue operation of the vehicle until the retrofit is completed.
24KWH2024-12-03. Service bulletin. Safety Recall Refer to Cummins Safety Recall (Campaign) C7083. Cummins alerted Kenworth to a defect which relates to motor vehicle safety in certain Cummins X15 engines equipped with certain fuel pumps. Refer to Cummins Safety Recall (Campaign) C7083 for repair information.
E3062023-11-10. Service bulletin. PACCAR MX-11 & MX-13 EPA2021 Fuel Filter Drain & Change Info Incorrect fuel filter drain and replacement procedures on EPA21 MX-11 and MX-13 engines can result in the following Debris and contaminants introduced into the high-pressure fuel system. Denial of warranty claims for injector and/or fuel system faults. Misfire, rough running, engine knock, and other associated faults and symptoms. Correct fuel filter procedures are outlined in attached service documentation.
E2832023-07-05. Service bulletin. PACCAR MX Engine Model Year 2021B Engine Fuel Injector Connectors Not Seated Campaign - Certain Model Year 2022 chassis equipped with an Engine Model Year 2021B PACCAR MX-11 or MX-13 engine may experience partially seated fuel injector electrical connectors. This will result in an intermittent connection between the engine controller (PCI-2) and the affected injectors, resulting in injector and/or misfire fault codes. Injector connectors will be inspected and reseated. The expiration date of this campaign has been extended from 07/01/2023 to 01/01/2024.
E2902023-07-05. Service bulletin. FIX-AS-FAIL Updated procedures and claim filing information. EPA2021 injector cleaning is referenced in RMI for certain injector faults. Complete the procedures in E290. Refer to E300 for in-tank additive information
03-087 (E295)2023-03-06. Service bulletin. Certain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual gauge may display incorrect restriction levels. The virtual gauge will be temporarily disabled until a revised sensor strategy is developed.
43-0712021-10-05. Service bulletin. Fix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are available. As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed DEF sensor by disabling the DEF sensor diagnostics.
21KWC2021-07-06. Service bulletin. Safety Recall – Cummins Fuel Rail Leak – NHTSA ID: 21V391 / TC: 2021-323, Cummins Recall: C2423. Cummins PX9 and ISX12 fuel rails may leak around a sealing washer, potentially resulting in fuel leaks. Undetected prolonged diesel fuel spray in the presence of an ignition source may increase the risk of fire.
44-0332020-08-05. Service bulletin. Non-Safety Campaign – The end cap welds on certain fuel tanks may not meet internal quality standards due to improper weld equipment settings. The fuel tanks will be replaced.