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Service bulletin 25PACF

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 id11027067
Published by NHTSA2026-01-06
Manufacturer's number25PACF
Manufacturer's date2025-12-23
Campaign id or software version25PACF
NHTSA componentEXTERIOR LIGHTING

NHTSA's summary

Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013 / Q21-1157-002-002 / Q21-1157-004-004 / Q21-1157-006-006 / Q21-1157-009-009. See attached Parts Matrix for required parts per chassis.

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

Lighting

Vehicles listed
KENWORTH L7702024, 2025, 2026
KENWORTH T1802023, 2024, 2025
KENWORTH T2802023, 2024, 2025, 2026
KENWORTH T3802023, 2024, 2025, 2026
KENWORTH T4802023, 2024, 2025, 2026
KENWORTH T6802023, 2024, 2025, 2026
KENWORTH T8802023, 2024, 2025, 2026
KENWORTH W9902023, 2024, 2025, 2026
PETERBILT 5202023, 2024, 2025, 2026
PETERBILT 5352023, 2024, 2025
PETERBILT 5362023, 2024, 2025, 2026
PETERBILT 5372023, 2024, 2025, 2026
PETERBILT 5482023
PETERBILT 5482024, 2025, 2026
PETERBILT 5672023, 2024, 2025, 2026
PETERBILT 5792023, 2024, 2025, 2026
PETERBILT 5892024, 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
20225912022-10-17. Lights And Instruments
20223142022-06-15. Lights And Instruments

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
34-1012026-06-03. Service bulletin. Certain Peterbilt Model 589 chassis equipped with LED headlamps may need a relay and fuses for the integrated heaters to be functional.
34-1002026-04-07. Service campaign. Halogen Headlamp Operation -Activating the Flash to Pass system on certain [Kenworth / Peterbilt] vehicles may cause one headlamp to deactivate.
25KWB/25PBB2026-01-06. Service bulletin. 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.
25PACF2025-09-03. Service campaign. Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013. Parts and procedures for Phase 2 chassis will be available at a later date. This bulletin will be updated at that time. Please refer to the condition section for more details. Certain Ethernet Multiplexed Architecture (EMUX) chassis fail to conform to Federal and Canada Motor Vehicle Safety Standards (FMVSS/CMVSS) No. 108. Delayed or unsteady illumination of the vehicle’s stop lamps, reverse lamps, turn signal lamps and inadvertent change in headlamp illumination or lift axle position may"
25PBB2025-04-04. Service bulletin. Safety Recall The Exterior Lighting Switch (ELS) in certain Model 535, 536, 537, 548, and 567 chassis may not function and can be reset only by a key cycle. This issue may result in non-compliance with FMVSS/CMVSS 101 and 108. Affected chassis must have the Vehicle Soft ware updated.
25KWB2025-04-04. Service bulletin. Safety Recall Updated software and repair procedures are now available. The Exterior Lighting Switch (ELS) in certain T180/T280/T380/T480 chassis may not function and can be reset only by a key cycle. This issue may result in non-compliance with FMVSS/CMVSS 101 and 108. Affected chassis must have the Vehicle Software updated.
25PBB2025-03-04. Other. "Safety Recall – Interim Notification The Exterior Lighting Switch (ELS) in certain Model 535, 536, 537, 548, and 567 chassis may not function and can be reset only by a key cycle. This issue may result in non-compliance with US Federal Motor Vehicle Safety Standards (FMVSS) or Canadian Motor Vehicle Safety Standards (CMVSS) 101 and 108. This bulletin will be updated when software and programming procedures are available."
25KWB2025-03-04. Other. "Safety Recall – Interim Notification The Exterior Lighting Switch (ELS) in certain T180/T280/T380/T480 chassis may not function and can be reset only by a key cycle. This issue may result in non-compliance with FMVSS/CMVSS 101 and 108. This bulletin will be updated when software and programming procedures are available."