NHTSA ID Number: 11034281
Manufacturer Communication Number: CE033
TSB/Document Date: 2026-07-02
Summary
"KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy."
001
2434418 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2461235 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2461236 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477784 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477785 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477786 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477787 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477862 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477863 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477864 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2477865 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2491046 (PEX)
UEL
F
044-004Engine
INJECTOR
001
2491047 (PEX)
UEL
F
044-004Engine
INJECTOR
001
For reimbursement of past repairs, unless noted above as not eligible, file a claim in accordance with the
warranty procedure manual.
Attach an invoice and receipt to the claim to document the repair and payment made.
In addition, attach receipt of reimbursement made to customer for the initial invoice/costs of repair.
Retroactive claims without these items will be denied.
Warranty
The emissions warranty will cover the repair costs for any failure of an emissions-related part described
in this bulletin that results under normal use and service, caused by a warrantable failure, which must be
the result of a defect in material and/or factory workmanship. Reimbursement will include:
Parts
Labor
Consumables (when not reusable)
NOTE
ummins-powered chassis do
C
not have Extended Emissions
Coverage under this bulletin.
PROACTIVE REPAIRS ARE NOT COVERED BY THIS PROGRAM.
Towing will only be covered if 'engine' emission component failure occurs within the base engine period
of 24 months/250,000 miles/6,250 hours, whichever comes first. Outside of base engine coverage,
towing and travel are excluded.
PACCAR
will pay for reasonable labor costs for engine removal and reinstallation when necessary to
repair a warrantable failure.
The emissions warranty is retroactive and applies to qualifying warrantable failures that customers have
already had repaired at their expense.
These components qualify for coverage on EMY2023 PACCAR MX-11 and MX-13 engines:
Engine Model
Year
PD Part
P
Number
art
P
Description
2023 (MX-13) 2314737 (PEX) Fuel Injector
(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)
2477863 (PEX)
(2)
2477865 (PEX)
(2)
2491047 (PEX)
(2)
2023 (MX-11) 2314736 (PEX) Fuel Injector
(1)
2383578 (PEX)
(1)
2394547 (PEX)
(1)
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)
Part added in a previous update.
(2)Part added in latest update.
If there is a fallure of any of the parts listed above, submit a warranty claim through PACCAR
Registration 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 Chassis List
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
Peterbilt Motors 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 Peterbilt Customer,
This is not a recall or campaign. You do not need to schedule an appointment with your
dealer unless your vehicle experiences a problem.
This letter has been sent to inform you that Peterbilt Motors 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 (EWC Code 9485372)
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)
Peterbilt Motors Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
2434417 (PEX)(2)
2461236 (PEX)(2)
2477785 (PEX)(2)
2477787 (PEX)(2)
2477863 (PEX)(2)
2477865 (PEX)(2)
2491047 (PEX)(2)
2314736 (PEX)(1) Inefficient fuel injector performance can lead to
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.
Fuel Injector (MX-11,
EPA21)
If you have previously paid to replace any of the components listed in the table above, you may
be eligible for reimbursement of the cost of parts and labor. Please provide your Peterbilt
Peterbilt Motors Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
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 Peterbilt dealer, please scan the QR code at the top of this letter or use
Find a Dealer at www.Peterbilt.com. When contacting your selected dealer, refer to Extended
Warranty Code (EWC) 9485372 and the VIN listed below or on the back of 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,
Peterbilt Customer Service
Peterbilt Motors 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 Peterbilt 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 your vehicle experiences a problem.
This letter has been sent to inform you that Peterbilt Motors 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 (EWC Code 9485372)
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)
Peterbilt Motors Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
2460412 (PEX)(1)
2460414 (PEX)(1)
2434417 (PEX)(2)
2461236 (PEX)(2)
2477785 (PEX)(2)
2477787 (PEX)(2)
2477863 (PEX)(2)
2477865 (PEX)(2)
2491047 (PEX)(2)
2314736 (PEX)(1) Inefficient fuel injector performance can lead to
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.
Fuel Injector (MX-11,
EPA21)
Peterbilt Motors Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
If you have previously paid to replace any of the components listed in the table above, you may
be eligible for reimbursement of the cost of parts and labor. Please provide your Peterbilt
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 Peterbilt dealer, please scan the QR code at the top of this letter or use
Find a Dealer at www.Peterbilt.com. When contacting your selected dealer, refer to Extended
Warranty Code (EWC) 9485372 and the VIN listed below or on the back of 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,
Peterbilt Customer Service
- 6X better wear protection on critical engine parts than...
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- Protection for 10,000 miles between oil changes
- Meets or exceeds the following specifications: API SP/SN...
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TSB/Document ID: CE033
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-25
MFR Internal Campaign ID/Software Version: CE033
Communication Type: Warranty Program/Extension
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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