1/5/26, 2:14 PM

Aftersales Service - Powertrain Service Bulletin

E334: EMY2021 PACCAR MX Exempt Engine Label
Replacement
Number

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E334

Subject
EMY2021 PACCAR MX Exempt Engine Label Replacement

Date
12/12/2025

Condition
To ensure compliance with emissions regulations and avoid potential regulatory fines, affected chassis
must be inspected to determine if an engine label replacement is required.

Chassis Affected
46 (44 US and 2 Canada) vehicle model year 2022 model 389 / 520 / 567 / 579 chassis built from
02/16/2021 through 04/26/2021 equipped with EMY2021 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 E334 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
E334 campaign code prior to performing this repair.
4. Follow the procedures in the Links section to inspect and, if necessary, replace the MX engine
label.

Warranty
Starting on 12/11/2025, Peterbilt will pay for parts at dealer net plus applicable mark-up and labor:
File an additional claim for extraordinary circumstances. A recommended repair for standard labor
must be filed first.
0.1 hours to inspect the PACCAR MX engine label only (no replacement required). Use
https://paccarnet.sharepoint.com/sitepages/pwrtrnsvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9za…

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1/5/26, 2:14 PM

Aftersales Service - Powertrain Service Bulletin

Recommended Repair Code E334A.
The claim must include a clear picture of the compliant engine label as it is installed.
0.3 hours to inspect and replace the PACCAR MX engine label. Use Recommended Repair Code
E334B.
The claim must include a clear picture of both the original exempt label and the new
compliant label as it is installed.
File the claim within 14 days in accordance with the Warranty Policy.

​PRWS CLAIM CODING ​​​
​ ampaign
C
​E334
Code:

​ ampaign
C
Type:

​ laim
C
​Engine ​Repair Type:
Category:
Customer 172 –
Concern Wrong
Code:
Part

​Field Repair
​Proactive

​Causal Code: 00 – No Failure

​03 –
​ orrective
C
Replace ​Responsibility
CAMP-Campaign
Action
with
Code:
Code:
New
​ ailure
F
053​Causal Part:
Location: 005-001
​ upplier
S
Code:

​N/A

​SRT Code:

​MXENGINELABEL
​B25-42A:
0.1hrs.
Bulletin E334
Paccar MX
Exempt Engine
Label Inspection
Only per bulletin
procedure
B25-42B:
0.3hrs.
Bulletin E334
Paccar MX
Exempt Engine
Label
Replacement per
bulletin procedure

Parts
For engine label ordering, please refer to the repair procedures in the Links section.

https://paccarnet.sharepoint.com/sitepages/pwrtrnsvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9za…

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1/5/26, 2:14 PM

Aftersales Service - Powertrain Service Bulletin

​Quantity ​Part Number

​Description

​1

​ ABEL - MX
L
ENGINE

​MXENGINELABEL

Procedure
Follow your dealership's safety procedures and precautions to ensure the vehicle is safely
repaired and maintained.
Please see the Links section below for procedures to inspect and, if necessary, replace the MX engine
label.

Links
Chassis List
Repair Procedure
Customer Letter - US/CAN English
Customer Letter - CAN French

https://paccarnet.sharepoint.com/sitepages/pwrtrnsvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9za…

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

CAMPAIGN LETTER

***********************************SNGLP
TECH TRUCKING INC
PO BOX 401
LEWISTON, NY 14092-0401

ALDOFLHNGIGLDK
APHNNBNKAPPONK
AKCDAFGGIMPBBK
DLLDDLLLLDDLLL

000001
T1 P1
E334

Field Repair Notice: E334

CAMPAIGN LETTER

ATFDFDDDDTADFTATFAFTFTFAADTAFDDAFAAAAFATADATDAFAFFTATAFFDADTTFTFA

12/19/25
Subject: E334: EMY2021 PACCAR MX Exempt Engine Label Replacement
Expiration Date: None

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
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
AHEEEHAPMDGPIEALBLDFMOLEJFHGFPAHEEEHA
BNFFFNBPFLJHFONCAOFCIKMPAOEPEPBNFFFNB
AHBLNHFCBIFAIBLHCPDBHFJGCONMCAKMDGAMM
PLOBADFHMHHGGJBAMCLCMKEOEFJHDIJJCFGDL
LNFGMDFPBKNMBPMKCPMFOCMNIDEPDKHKNOAHO
NLKACPFHNPBIHELFNCNEFHFAEFOKCIDPNFPLD
LIHIPOFFHABFBBOMBPEPCLALFOANAANHIANFB
ENNNNFEHIGNEJDAMIGKKIOJIJKMLAHFHAFKAI
APBBBPAPMPKHAJLGENIOELMOAPPPAGCGEDLHA
HHHHHHHPHPHPPPHPHPHPHPHHPPHHHPHPHPHHH

Peterbilt Motors Company has determined that certain vehicle model year 2022 model 389, 520, 567, and 579 vehicles built from 02/16/2021 through
04/26/2021 equipped with Engine Model Year (EMY) 2021 PACCAR MX engines may have an expired exempt engine label installed.
What is the problem?

In order to avoid the risk of regulatory fines, a compliant engine label must be installed.

What will your dealer do?

Your dealer will inspect the engine label and, if it is exempt, replace it with a compliant label, free of charge.

What should you do?

Contact your dealer to schedule a repair appointment. This service may require up to 1.0 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 E334: PACCAR MX Exempt 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

Our records indicate that these vehicles are affected by E334 and are owned by TECH TRUCKING INC
1NPCXPTX8ND762933