2426853 (PEX)(1)
2426855 (PEX)(1)
2429854 (PEX)(1)
2428773 (PEX)(1)
2452061 (PEX)(1)
2460409 (PEX)(1)
2460411 (PEX)(1)
2460413 (PEX)(1)
2434418 (PEX)(2)
2461235 (PEX)(2)
2477784 (PEX)(2)
2477786 (PEX)(2)
2477862 (PEX)(2)
2477864 (PEX)(2)
2491046 (PEX)(2)
(1)Part added in a previous update.
(2)Part added in latest update.

If there is a failure of any of the parts listed above, submit a warranty claim through PACCAR Registration
https://paccarnet.sharepoint.com/sitepages/emissvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9zaX…

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6/24/26, 1:21 PM

Aftersales Service - Emission Service Bulletin

and Warranty System (PRWS). Ensure the correct VIN number and Causal Part removed from the vehicle are on
the submitted claim.

Attachments
CE033 MX Component Specific Emissions Extended Warranty for EMY2023 PACCAR MX-11 and MX-13 Engines
US Customer Letter
CE033 MX Component Specific Emissions Extended Warranty for EMY2023 PACCAR MX-11 and MX-13 Engines
US Customer Letter – Spanish
CE033 MX Component Specific Emissions Extended Warranty for EMY2023 PACCAR MX-11 and MX-13 Engines
CAN Customer Letter
CE033 MX Component Specific Emissions Extended Warranty for EMY2023 PACCAR MX-11 and MX-13 Engines
CAN Customer Letter - French
CE033 MX Component Specific Emissions Extended Warranty for EMY2023 PACCAR MX-11 and MX-13 Engines
Chassis List

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Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888

[Date]
Subject: CE033: MX Component Specific Emissions Extended Warranty for
EMY2023 PACCAR MX-11 and MX-13 Engines
Expiration Date: None
This notice applies to your vehicle; Your VIN(s) can be found on the front or back of this page.
Dear Kenworth Customer,
This is not a recall or campaign. You do not need to schedule an appointment with your
dealer unless you experience a problem with your vehicle.
This letter has been sent to inform you that Kenworth Truck Company has extended the warranty
coverage on certain emissions components installed on your vehicle(s). Your vehicle(s)
contain(s) one or more of the parts listed in this letter. No action is needed on your part.
The Emissions Warranty Coverage for the components listed in the table below has been
extended to 10 years, 435,000 vehicle miles/700,000 km, or 22,000 engine hours from the
original warranty registration date, whichever comes first.
Table 1 Parts Covered by Extended Warranty Coverage (EWC Code 9202164)
Part Name
Fuel Injector (MX-13,
EPA21)

Part Number
2314737 (PEX)(1)
2383579 (PEX)(1)
2394548 (PEX)(1)
2403776 (PEX)(1)
2403201 (PEX)(1)
2403778 (PEX)(1)
2423652 (PEX)(1)
2423654 (PEX)(1)
2426854 (PEX)(1)
2426856 (PEX)(1)
2429855 (PEX)(1)
2428774 (PEX)(1)
2452062 (PEX)(1)
2460410 (PEX)(1)
2460412 (PEX)(1)
2460414 (PEX)(1)
2434417 (PEX)(2)
2461236 (PEX)(2)
2477785 (PEX)(2)
2477787 (PEX)(2)

Result of Failure
Inefficient fuel injector performance can lead to
insufficient regeneration and high soot loading of
DPF due to uneven fuel burning.

Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888

2477863 (PEX)(2)
2477865 (PEX)(2)
2491047 (PEX)(2)
Fuel Injector (MX-11,
2314736 (PEX)(1) Inefficient fuel injector performance can lead to
EPA21)
2383578 (PEX)(1) insufficient regeneration and high soot loading of
2394547 (PEX)(1) DPF due to uneven fuel burning.
2403775 (PEX)(1)
2403200 (PEX)(1)
2403777 (PEX)(1)
2423651 (PEX)(1)
2423653 (PEX)(1)
2426853 (PEX)(1)
2426855 (PEX)(1)
2429854 (PEX)(1)
2428773 (PEX)(1)
2452061 (PEX)(1)
2460409 (PEX)(1)
2460411 (PEX)(1)
2460413 (PEX)(1)
2434418 (PEX)(2)
2461235 (PEX)(2)
2477784 (PEX)(2)
2477786 (PEX)(2)
2477862 (PEX)(2)
2477864 (PEX)(2)
2491046 (PEX)(2)
(1)
Components that were included in a previous letter.
(2)
Additional component added to Extended Warranty Coverage.
If you have previously paid to replace one of the components listed in the tables above, you may
be eligible for reimbursement of the cost of parts and labor. Please provide your Kenworth
Dealer with a receipt for the repair and your dealer will file a claim on your behalf. If approved,
your dealer will issue reimbursement.
To locate your nearest dealer please scan the QR code at the top of this letter or use the Dealer
Locator at www.Kenworth.com. When contacting your selected Kenworth dealer, refer to
Extended Warranty Code (EWC) 9202164 and the VIN listed on this letter.
If you are the lessor of this vehicle, federal regulations require you to forward a copy of this
notice to the lessee within ten days. If you no longer own this vehicle, please email the last 8
digits of the VIN and the new owner’s name and address to servicebulletins@paccar.com.
Sincerely,

Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888

Kenworth Customer Service

Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888

[Date]
Subject: CE033: MX Component Specific Emissions Warranty for EMY2023
PACCAR MX-11 and MX-13 Engines
Expiration Date: None
This notice applies to your vehicle; Your VIN(s) can be found on the front or back of this page.
Dear Kenworth Customer,
This notice is sent to you in accordance with the requirements of the Canadian Environmental
Protection Act, 1999.
This is not a recall or campaign. You do not need to schedule an appointment with your
dealer unless you experience a problem with your vehicle.
This letter has been sent to inform you that Kenworth Truck Company has extended the warranty
coverage on certain emissions components installed on your vehicle(s). Your vehicle(s)
contain(s) one or more of the parts listed in this letter. No action is needed on your part.
The Emissions Warranty Coverage for the components listed in the table below has been
extended to 10 years, 435,000 vehicle miles/700,000 km, or 22,000 engine hours from the
original warranty registration date, whichever comes first.
Table 1 Parts Covered by Extended Warranty Coverage (EWC Code 9202164)
Part Name
Part Number
Result of Failure
Fuel Injector (MX-13,
EPA21)

2314737 (PEX)(1) Inefficient fuel injector performance can lead to
2383579 (PEX)(1) insufficient regeneration and high soot loading of
2394548 (PEX)(1) DPF due to uneven fuel burning.
2403776 (PEX)(1)
2403201 (PEX)(1)
2403778 (PEX)(1)
2423652 (PEX)(1)
2423654 (PEX)(1)
2426854 (PEX)(1)
2426856 (PEX)(1)
2429855 (PEX)(1)
2428774 (PEX)(1)
2452062 (PEX)(1)
2460410 (PEX)(1)
2460412 (PEX)(1)
2460414 (PEX)(1)
2434417 (PEX)(2)
2461236 (PEX)(2)

Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888

2477785 (PEX)(2)
2477787 (PEX)(2)
2477863 (PEX)(2)
2477865 (PEX)(2)
2491047 (PEX)(2)
Fuel Injector (MX-11,
2314736 (PEX)(1) Inefficient fuel injector performance can lead to
EPA21)
2383578 (PEX)(1) insufficient regeneration and high soot loading of
2394547 (PEX)(1) DPF due to uneven fuel burning.
2403775 (PEX)(1)
2403200 (PEX)(1)
2403777 (PEX)(1)
2423651 (PEX)(1)
2423653 (PEX)(1)
2426853 (PEX)(1)
2426855 (PEX)(1)
2429854 (PEX)(1)
2428773 (PEX)(1)
2452061 (PEX)(1)
2460409 (PEX)(1)
2460411 (PEX)(1)
2460413 (PEX)(1)
2434418 (PEX)(2)
2461235 (PEX)(2)
2477784 (PEX)(2)
2477786 (PEX)(2)
2477862 (PEX)(2)
2477864 (PEX)(2)
2491046 (PEX)(2)
(1) Components that were included in a previous letter.
(2) Additional component added to Extended Warranty Coverage.
If you have previously paid to replace one of the components listed in the tables above, you may
be eligible for reimbursement of the cost of parts and labor. Please provide your Kenworth
Dealer with a receipt for the repair and your dealer will file a claim on your behalf. If approved,
your dealer will issue reimbursement.
To locate your nearest dealer please scan the QR code at the top of this letter or use the Dealer
Locator at www.Kenworth.com. When contacting your selected Kenworth dealer, refer to
Extended Warranty Code (EWC) 9202164 and the VIN listed on this letter.

Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888

If you are the lessor of this vehicle, federal regulations require you to forward a copy of this
notice to the lessee within ten days. If you no longer own this vehicle, please email the last 8
digits of the VIN and the new owner’s name and address to servicebulletins@paccar.com.
Sincerely,
Kenworth Customer Service

CE033 - MX Component-Specific Emissions Warranty for
EMY2023 PACCAR MX-11 and MX-13 Engines
6/19/2026

 Edit

 Clone

CE033

MX Component-Specific Emissions Warranty for EMY2023 PACCAR MX-11 and MX-13 Engines

Whats New Abstract
14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this
warranty policy.

Introduction
U.S. & Canadian Federal emissions regulations require that the warranty coverage is a period of ten (10) years or
435,000 miles/700,000 km/22,000 engine hours, whichever comes first, from the original warranty registration
date for these specific components on the MY2023 PACCAR MX-11 and MX-13 Engines. PACCAR has implemented
the extension and it is effective retroactively unless the part is listed as ineligible for reimbursement below.

Revision
06/19/2026: 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been
added to this warranty policy.
07/02/2025: 32 fuel injector part numbers (16 for MX-11 and 16 for MX-13) have been added to this
warranty policy.

Condition
Units that have coverage under this warranty will be identified in Service Information Record
(SIR):
​Sales Code

​ overage
C
Description

​9485372

​ W: MX
E
Emissions
10yr/435K
Miles (700K
KM) – Engine
MY2023

Submit a long-form warranty claim through PRWS, using the applicable claim type shown in the chart
below, for any repair that meets the requirements of this bulletin. Please ensure the correct VIN number

is selected and that all claim filing requirements are met.
Use the following coding when submitting your warranty claim:
PPD Part
Number

Part
​Claim ​Failure
Description Type Location

I​NJECTOR,
​044-004​2314736 (PEX) MX-11,
​Engine
001
EPA21
​INJECTOR,
​044-004​2314737 (PEX) MX-13,
​Engine
001
EPA21
I​NJECTOR,
​044-004​2383578 (PEX) MX-11,
​Engine
001
EPA21
I​NJECTOR,
​044-004​2383579 (PEX) MX-13,
​Engine
001
EPA21
​INJECTOR,
​044-004​2394547 (PEX) MX-11,
​Engine
001​
EPA21
I​NJECTOR,
​044-004​2394548 (PEX) MX-13,
​Engine
001
EPA21
2403200​(PEX)

​ UEL
F
​044-004​Engine​
INJECTOR
001

​2403201 (PEX)

​FUEL
​044-004​Engine
INJECTOR
001

I​NJECTOR,
​044-004​2403775 (PEX) MX-11,
​Engine
001
EPA21
​INJECTOR,
​044-004​2403776 (PEX) MX-13,
​Engine
001
EPA21
I​NJECTOR,
​044-004​2403777 (PEX) MX-11,
​Engine
001​
EPA21
​INJECTOR,
​044-004​2403778 (PEX) MX-13,
​Engine
001
EPA21
​2423651 (PEX)

​ UEL
F
​044-004​Engine
INJECTOR
001

​2423652 (PEX)

​ UEL
F
​044-004​Engine
INJECTOR
001

​2423653 (PEX)

​ UEL
F
​044-004​Engine
INJECTOR
001

​2423654 (PEX)

​ UEL
F
​044-004​Engine
INJECTOR
001

​INJECTOR,
​044-004​2426853 (PEX) MX-11,
​Engine
001
EPA21/24
INJECTOR,
​044-004​2426854 (PEX) MX-13,
​Engine
001
EPA21/24
​INJECTOR,
​044-004​2426855 (PEX) MX-11,
​Engine
001
EPA21/24
INJECTOR,
​044-004​2426856(PEX) MX-13,
​Engine
001
EPA21/24
​2428773 (PEX)

​ UEL
F
​044-004​Engine
INJECTOR
001

I​NJECTOR,
​044-004​2428774 (PEX) MX-13,
​Engine
001
CARB 24
​2429854 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2429855 (PEX)

​FUEL
​044-004​Engine
INJECTOR
001

​2452061 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2452062 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2460409 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2460410 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2460411 (PEX)

​FUEL
​044-004​Engine
INJECTOR
001

​2460412 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2460413 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

​2460414 (PEX)

FUEL
​044-004​Engine
INJECTOR
001

2434417 (PEX)

​ UEL
F
​044-004​Engine
INJECTOR