E340: Engine Model Year 2025 PACCAR MX Engine Label
Replacement
4/9/2026 7 edit © Clone
E340
Subject
Engine Model Year (EMY) 2025 PACCAR MX Engine Label Replacement
Whats New Abstract
Certain vehicle model year 2026 Kenworth chassis equipped with EMY2025 PACCAR MX engines require an
amended engine label. The engine label is now available for order and installation.
Condition
To ensure compliance with emissions regulations and avoid potential regulatory fines, affected chassis are
required to have the engine label replaced.
Chassis Affected
79 (75 US and 4 Canada) vehicle model year 2026 T680 / T880 manufactured between 09/26/2025 and
11/25/2025 equipped with EMY2025 PACCAR MX engines
Action
Campaign
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.
2. In Service Management, select campaign E340 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
E340 campaign code prior to performing this repair.
4. Follow the procedures in the Links section to replace the PACCAR MX engine label.
Warranty
Starting on 04/10/2026, Kenworth will pay for parts at dealer net plus applicable mark-up and labor:
¢ 0.3 hours (T680 / T880) of labor to replace the PACCAR MX engine label (includes photos and TCS365
case). Select Recommended Repair Code E340.
© The claim must include clear pictures of both the original and the new label as it is installed.
¢ File the claim within 14 days in accordance with the Warranty Policy.
¢ File an additional claim for extraordinary circumstances. A recommended repair for standard labor must
be filed first.
° Kenworth dealers may perform E340 repairs on Peterbilt chassis, but Recommended Repairs do not

apply. For Peterbilt chassis repairs, use the long claim input form.
Take-Off Parts Disposition:
© Destroy 30 days after claim is paid
PRWS CLAIM CODING

Campaign |E340 |Campaign Field Repair

Code: Type

Claim Engine |Repair Type | Proactive

Category:

Customer |172 Causal Code

Concern

Code

Corrective |03 Responsibility |Camp

Action Code:

Code

Failure 053- Causal Part MXENGINELABEL

Location |005-

001

Supplier |N/A SRT Code B26-20A

Code 0.3 hours (T680
/ T880)
Bulletin E340:
Engine Model
Year 2025 Paccar
MX Engine Label
Replacement
Recommended
Repair: E340

Parts

For engine label ordering, submit a TCS365 case by following the step below (labels will be sent via

next day air from PACCAR Parts).
Quantity] Part Number
MXENGINELABEL| LABEL - MX ENGINE
1. Open TCS365 in Google Chrome or Microsoft Edge.
2. Select: Order Support/Order Inquiry
3. Select Case Type: Place an Order.
4. Select Case Category: Labels.
5. On the Place an Order page: Fill in the following fields as shown and fill in the other fields as
appropriate:
© Account Name: Appropriate for your dealer
© Vehicle Year: 2026
© Subject: £340: Engine Model Year 2025 PACCAR MX Engine Label Replacement
© Dealer PO #: Dealer purchase order number
© Shipping method: Select from the drop-down list
© Part Number: MXENGINELABEL
© Vehicle OEM: Select from the drop-down list
© Vehicle Chassis Number: Last 8 digits of VIN (Must be included to obtain the correct label)
i) NOTE
For fleets ordering new engine labels for multiple
VINs, add a note in the Description field with
Multiple Fleet VINs. Complete the Multiple Label
Order Sheet linked in the Links section below and
attach it via the Upload File button.
Procedure
A WARNING
Repair or maintenance procedures may pose a
safety risk in limited circumstances. You must read
all procedure steps before performing any work
and follow all dealership safety procedures or
precautions. Failure to comply may result in death,
personal injury, equipment damage, or property
damage.
Please see the Links section below for procedures to replace the PACCAR MX engine label.
Attachments
E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement Repair Procedure

E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement Kenworth Chassis List
E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement US Customer Letter
E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement CAN Customer Letter
E340 Multiple Label Order Sheet

Kenworth Truck Company
KENWORTH Customer Service Departinent
C/O PACCAR Parts
A PACCAR COMPANY 750 Houser Way North
Renton, WA 98057
(425) 828-5888
[Date] okra)
Subject: E340: Engine Model Year 2025 PACCAR MX Engine Label Replacement + ;
Expiration Date: None et: mn
Oeste g
FIELD SERVICE CAMPAIGN
This notice applies to your vehicle(s) with VIN(s) listed at the bottom or back of this page.
Dear Kenworth Customer,
Kenworth Truck Company has determined that certain vehicle model year 2026 T680 and T880
vehicles manufactured between 09/26/2025 and 11/25/2025 with engine model year 2025
PACCAR MX engines require an engine label update.
What is the problem? Compliant engine label is required to avoid regulatory fines.
What will your dealer do? Install an updated engine label to ensure regulatory compliance.
What should you do? Contact your dealer to schedule a repair appointment. This
service may require up to 1 hour of labor.
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 scheduling this service, please refer to campaign E340:
Engine Model Year 2025 PACCAR MX Engine Label Replacement and the VIN(s) listed in this
letter.
If you no longer own the vehicle(s), please send an email to [email protected] with the
complete VIN(s) and the name and address of the new owner.
We appreciate your attention to this matter and value your loyalty to Kenworth and its dealer
network.
Sincerely,
Kenworth Customer Service

E340: Engine Model Year 2025 PACCAR MX Engine Label
Replacement
4/9/2026 7 edit © Clone
E340
Subject
Engine Model Year (EMY) 2025 PACCAR MX Engine Label Replacement
Whats New Abstract
Certain vehicle model year 2026 Peterbilt chassis equipped with EMY2025 PACCAR MX engines require an
amended engine label. The engine label is now available for order and installation.
Condition
To ensure compliance with emissions regulations and avoid potential regulatory fines, affected chassis are
required to have the engine label replaced.
Chassis Affected
33 US vehicle model year 2026 Model 520 / 567 / 579 / 589 manufactured between 09/23/2025 and
12/04/2025 equipped with EMY2025 PACCAR MX engines
Action
Campaign
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.
2. In Service Management, select campaign E340 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
E340 campaign code prior to performing this repair.
4. Follow the procedures in the Links section to replace the PACCAR MX engine label.
Warranty
Starting on 04/10/2026, Peterbilt will pay for parts at dealer net plus applicable mark-up and labor:
¢ 0.3 hours (Model 567 / 579 / 589) of labor to replace the PACCAR MX engine label (includes photos
and TCS365 case). Select Recommended Repair Code E340.
¢ 0.4 hours (Model 520) of labor to replace the PACCAR MX engine label (includes photos and TCS365
case). Select Recommended Repair Code E340.
¢ The claim must include clear pictures of both the original and the new label as it is installed.
¢ File the claim within 14 days in accordance with the Warranty Policy.
° File an additional claim for extraordinary circumstances. A recommended repair for standard labor must

be filed first.
© Peterbilt dealers may perform E340 repairs on Kenworth chassis, but Recommended Repairs do not
apply. For Kenworth chassis repairs, use the long claim input form.
Take-Off Parts Disposition:
° Destroy 30 days after claim is paid
PRWS CLAIM CODING

Campaign |E340 |Campaign Field Repair

Code: Type

Claim Engine |Repair Type | Proactive

Category:

Customer |172 Causal Code

Concern

Code

Corrective |03 Responsibility |Camp

Action Code:

Code

Failure 053- Causal Part MXENGINELABEL

Location |005-

001

Supplier |N/A SRT Code B26-20A

Code 0.3 hours
(Model 567 /
579 / 589)
0.4 hours
(Model 520)
Bulletin E340:
Engine Model
Year 2025 Paccar
MX Engine Label
Replacement
Recommended
Repair: E340

Parts

For engine label ordering, submit a TCS365 case by following the step below (labels will be sent via

next day air from PACCAR Parts).
Quantity] Part Number
MXENGINELABEL| LABEL - MX ENGINE
1. Open TCS365 in Google Chrome or Microsoft Edge.
2. Select: Order Support/Order Inquiry
3. Select Case Type: Place an Order.
4. Select Case Category: Labels.
5. On the Place an Order page: Fill in the following fields as shown and fill in the other fields as
appropriate:
© Account Name: Appropriate for your dealer
© Vehicle Year: 2026
© Subject: £340: Engine Model Year 2025 PACCAR MX Engine Label Replacement
© Dealer PO #: Dealer purchase order number
© Shipping method: Select from the drop-down list
© Part Number: MXENGINELABEL
© Vehicle OEM: Select from the drop-down list
© Vehicle Chassis Number: Last 8 digits of VIN (Must be included to obtain the correct label)
i) NOTE
For fleets ordering new engine labels for multiple
VINs, add a note in the Description field with
Multiple Fleet VINs. Complete the Multiple Label
Order Sheet linked in the Links section below and
attach it via the Upload File button.
Procedure
A WARNING
Repair or maintenance procedures may pose a
safety risk in limited circumstances. You must read
all procedure steps before performing any work
and follow all dealership safety procedures or
precautions. Failure to comply may result in death,
personal injury, equipment damage, or property
damage.
Please see the Links section below for procedures to replace the PACCAR MX engine label.
Attachments
E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement Repair Procedure

E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement Chassis List
E340 Engine Model Year 2025 PACCAR MX Engine Label Replacement US Customer Letter
E340 Multiple Label Order Sheet

Peterbilt Motors Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
A PACCAR COMPANY Renton, WA 98057
(425) 828-5888
[Date] OR eto
Subject: E340: Engine Model Year 2025 PACCAR MX Engine Label Replacement epee
Expiration Date: None nas
Dg
FIELD SERVICE CAMPAIGN
This notice applies to your vehicle(s) with VIN(s) listed at the bottom or back of this page.
Dear Peterbilt Customer,
Peterbilt Motors Company has determined that certain vehicle model year 2026 Model 520, 567,
579, and 589 vehicles manufactured between 09/23/2025 and 12/04/2025 with engine model year
2025 PACCAR MX engines require an engine label update.
What is the problem? Compliant engine label is required to avoid regulatory fines.
What will your dealer do? _ Install an updated engine label to ensure regulatory
compliance.
What should you do? Contact your dealer to schedule a repair appointment. This
service may require up to | hour of labor.
To locate your nearest dealer please scan the QR code at the top of this letter or use Find a Dealer
at www.Peterbilt.com. When scheduling this service, please refer to campaign E340: Engine
Model Year 2025 PACCAR MX Engine Label Replacement and the VIN(s) listed in this letter.
If you no longer own the vehicle(s), please send an e-mail to servicebulletins@paccar.com with
the complete VIN(s) and the name and address of the new owner.
We appreciate your attention to this matter and value your loyalty to Peterbilt and its dealer
network.
Sincerely,
Peterbilt Customer Service