Safety Recall 25PACF: EMUX Exterior Lighting Not
Compliant With FMVSS/CMVSS 108
Number

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25PACF / NHTSA #: 25V436 / Transport Canada #: 2025-357

Supplier
PACCAR

Description
EMUX Exterior Lighting Not Compliant With FMVSS/CMVSS 108

Date
7/25/2025

What’s New
Safety Recall
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 and 3 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

occur due to the Vehicle Electronic Control Unit (VECU) software configuration. This can occur without warning
and may increase the risk of a crash.
This bulletin will be released in 3 phases:
Phase 1: ICE chassis equipped with VECU part number Q21-1157-013-011 / Q21-1157-013-013.
Phase 2: Battery Electric Vehicles (BEV) chassis equipped with VECU part number Q21-1157-013-011 / Q211157-013-013.
Phase 3: ICE and BEV chassis equipped with VECU part number Q21-1157-004-002 / Q21-1157-004-003 /
Q21-1157-004-004 / Q21-1157-006-006 / Q21-1157-009-009 / Q21-1157-004-012.

Introduction
Safety Recall
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 and 3 chassis will be available at a later date. This bulletin will be updated at
that time.
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

occur due to the Vehicle Electronic Control Unit (VECU) software configuration. This can occur without warning
and may increase the risk of a crash.
This bulletin will be released in 3 phases:
Phase 1: ICE chassis equipped with VECU part number Q21-1157-013-011 / Q21-1157-013-013.
Phase 2: Battery Electric Vehicles (BEV) chassis equipped with VECU part number Q21-1157-013-011 / Q211157-013-013.
Phase 3: ICE and BEV chassis equipped with VECU part number Q21-1157-004-002 / Q21-1157-004-003 /
Q21-1157-004-004 / Q21-1157-006-006 / Q21-1157-009-009 / Q21-1157-004-012.

Situation
29,601 (27,357 US and 2,244 Canada) Vehicle Model Year 2023-2026 L770 / T180 / T280 / T380 / T480 / T680 /
T880 / W990 built from 05/24/2022 through 05/22/2025 equipped with EMUX and VECU part number Q211157

Resolution
Safety Recall
Service all chassis affected that enter your dealership, even if the customer has no issue with the chassis.
1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if their
chassis is on the list and repair scope is available.
2. In Service Management, select Campaign 25PACF to add it to the case. If the unit is released back into
service without performing the repair, make sure to also release the Campaign in Service Management.
3. If you are not using Service Management to start repair orders, review SIR for “Complete” next to
the 25PACF Campaign code prior to performing this repair.
4. Follow the procedures to update DD2, Central Security Gateway (CSG) and VECU3 software as necessary.

Federal Law
​It is a violation of Federal law for a dealer to sell or lease new vehicles covered by this recall until the defect or
noncompliance has been corrected.

Warranty
There is no time or mileage limit for this recall. Kenworth will pay for labor to update the DD2, CSG2 and
VECU3 as necessary.
0.5 hours labor to process a PVP file and program software for DD2, CSG2 and VECU3 using DAVIE4.
Use Quick Claim Code 25PACFA.
File an additional claim for extraordinary circumstances. A quick claim for standard labor must be filed

first.
File the claim within 14 days in accordance with Warranty Policy CA009.

Take off parts disposition: N/A
PRWS CLAIM CODING
Campaign
Code:

25PACF Campaign
Type

Safety
Recall

Claim
Category:

Truck

Repair Type

Proactive

Customer
Concern
Code

225

Causal Code

93

Corrective
Action
Code

12

Responsibility
Code:

Camp

Failure
Location

003Causal Part
001-088

Q21-1157013-013

Supplier
Code

N/A

B25-23A
0.5 hrs
Bulletin
25PACF:
Update
software for
CSG2, DD2,
VECU3 and
perform
repair
verification
per bulletin
procedure

SRT Code

Procedure

Please follow your dealership's safety procedures and precautions to ensure the vehicle can be safely
repaired and maintained. Read all steps before beginning.
Software update procedure for Phase1 ICE chassis equipped with VECU part number Q21-1157-013-011
/ Q21-1157-013-013.
Note: Ensure DAVIE4 software version is the latest before completing this procedure.

1. Process PACCAR Vehicle Pro (PVP) file.
In PACCAR.net open PACCAR Vehicle Pro (PVP).
Enter chassis number.
Select “Save and Continue.”
Select “Submit”.
2. Connect the 12V battery charger to the vehicle’s 12V battery.
3. Connect DAVIE4 tool.
Connect Nexiq to the 9-pin diagnostics connector.
Connect the Ethernet cable. See TIB 98-016 for Ethernet cable details.

4. Ensure the PVP file is fully processed before moving on to the next steps.
5. Download required Digital Display (DD2), Central Security Gateway (CSG2) and Vehicle Electronic

Control Unit (VECU3) software using DAVIE4.
Click “Identify Vehicle” on DAVIE4 Home Screen.

Under “Vehicle update” section, click on “Software”.

Retrieve software for DD2, CSG2 and VECU3.

6. Upload required software for DD2, CSG2 and VECU3 modules following the prompts in DAVIE4 and in
order listed below.
Update DD2 module
Update the CSG2 module.
Update VECU3 module.
7. Run “relearn switches” following DAVIE4 prompts.
8. Clear codes in all modules.
Refresh “Vehicle Check” to ensure there are no active fault codes.
9. Disconnect DAVIE4 and battery charger.

Parts
Software only. No parts.

Links
KW Chassis List
Authored by: JK