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Service bulletin 25KWB/25PBB

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 id11027057
Published by NHTSA2026-01-06
Manufacturer's number25KWB/25PBB
Manufacturer's date2025-12-10
Campaign id or software version25KWB/25PBB
NHTSA componentEXTERIOR LIGHTING; ELECTRICAL SYSTEM

NHTSA's summary

A new Recommended Repair has been added. It must be used if safety recall 25PACF is performed prior to or at the same time as this repair since the 25PACF remedy also satisfies this safety recall.

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

Electrical system, Lighting

Vehicles listed
KENWORTH T1802023, 2024, 2025
KENWORTH T2802023, 2024, 2025, 2026
KENWORTH T3802023, 2024, 2025, 2026
KENWORTH T4802023, 2024, 2025, 2026
PETERBILT 5352024, 2025
PETERBILT 5362024, 2025, 2026
PETERBILT 5372024, 2025, 2026
PETERBILT 5482024, 2025, 2026
PETERBILT 5672024, 2025, 2026

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

Recalls for the same vehicles and component
20253572025-06-26. Lights And Instruments
25V4360002025-06-26. EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
20250362025-01-29. Lights And Instruments
25V0410002025-01-29. EXTERIOR LIGHTING:HAZARD FLASHING WARNING LIGHTS:SWITCH; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
24V9150002024-12-09. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

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
E3282026-09-23. Service campaign. 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.
01-0942026-09-23. Service bulletin. [SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold.
P0012026-08-20. Service bulletin. Chassis list has been updated to include 10 chassis. The total chassis count is now 101.
46-0292026-08-20. Service bulletin. 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.
43-0892026-07-22. Service bulletin. 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.
46-0272026-06-17. Service bulletin. 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.
43-0802026-06-17. Service bulletin. "KW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The repair procedure has been updated with additional note boxes for clear instructions. PB: The repair procedure has been updated with additional note boxes for clear instructions."
R26012026-06-04. Service bulletin. Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now available for installation.
02-1772026-06-03. Service bulletin. Troubleshooting procedures for 2.1m cab power windows are now available.
E3262026-05-06. Emissions. EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.