Daimler Truck
North America LLC

Field Service Campaign

October 2023
D23M1

Subject: Drilled Exhaust Rocker Arm Installation
Models Affected: Specific 2022 and 2023 Freightliner and Western Star vehicles, powered with
DETROITTM Gen 5 DD15 Engines manufactured December 14, 2020, through March 10, 2022

General Information
Daimler Trucks North America LLC, on behalf of its DETROITTM Powertrain Division, is initiating Field
Service Campaign D23M1 to modify the vehicles mentioned above.
Select DETROIT™ Gen 5 DD15® engines installed in certain vehicle applications require replacement of
all six exhaust rocker arms.
Some vehicles have experienced valve bridge failures due to wear from lack of lubrication to the adjusting
screw on the exhaust rocker arm. A new drilled exhaust rocker arm became effective with engines
manufactured in March of 2022. The drilled rocker arm utilizes an oil drilling that feeds oil to the adjusting
screw which reduces the failure mode described above.
There are approximately 17,142 engines affected by this Field Service Campaign.

Additional Repairs
Dealers must complete all outstanding Recall and Field Service campaigns prior to the sale or delivery of
a vehicle. Dealers will be liable for any progressive damage that results from their failure to complete
campaigns before sale or delivery of a vehicle. Owners may be liable for any progressive damage that
results from failure to complete campaigns within a reasonable time after receiving notification. Please
contact Warranty Campaigns for consideration of additional charges prior to performing the repair.

Work Instructions
Please refer to the attached work instructions. Prior to performing this field service campaign, check
the vehicle for a completion sticker (Form WAR261).

Page 1

Daimler Truck
North America LLC

Field Service Campaign

October 2023
D23M1

Replacement Parts
Replacement parts are now available and can be obtained by ordering the part number listed below from
your facing Parts Distribution Center.
Table 1 – Replacement Parts for D23M1
Campaign
Number

Part Number

Part Description

Qty per Kit

D23M1

DDE RA4720500633

KIT-OIL DRILLED ROCKER

1

DDE A4720160121

SEAL, ROCKER COVER

1

Removed Parts
Removed rocker arms must be saved and returned following normal part return procedures.

Labor Allowance
Table 2 – Labor Allowance for D23M1
Procedure

Time Allowed
(hours)

SRT Number

Corrective Action

D23MX
Drilled Exhaust Rocker Arm
Installation/Engine Idle
Adjustment/Reprogram One Module

3.4 hours

996-F154A

12-Repair
Recall/Campaign

Drilled Exhaust Rocker Arm Installation,
No Reprogramming

3.1 hours

996-F154B

12-Repair
Recall/Campaign

Drilled Exhaust Rocker Arm
Installation/Engine Idle
Adjustment/Reprogram Two Modules

3.5 hours

996-F154C

12-Repair
Recall/Campaign

Drilled Exhaust Rocker Arm
Installation/Engine Idle
Adjustment/Reprogram Three Modules

3.6 hours

996-F154D

12-Repair
Recall/Campaign

Claim Reimbursement
You will be reimbursed for your parts, labor, and handling (landed cost for Export Distributors) by submitting your
claim through the Warranty system within 30 days of completing this campaign. Please reference the following
information in OWL:
Table 3 – Claim Reimbursement for D23M1
Claim Type

Field Service Campaign

Campaign

D23M1

Component Code

045-008-052

Cause Code

A1-Campaign

Primary Failed Part

DDE A4710500634
ROCKER ARM - EXHAUST

Page 2

Daimler Truck
North America LLC

Field Service Campaign

October 2023
D23M1
Procedure A1
Labor Number

996-F154A
Drilled Exhaust Rocker Arm Installation/Engine Idle
Adjustment/Reprogram One Module

Labor Hours

3.4 Hours

Part Number

DDE RA4720500633

Parts Return

RETURN
Procedure B1

Labor Number

996-F154B
Drilled Exhaust Rocker Arm Installation, No Reprogramming

Labor Hours

3.1 Hours

Part Number

DDE RA4720500633

Parts Return

RETURN
Procedure C1

Labor Number

996-F154C
Drilled Exhaust Rocker Arm Installation/Engine Idle
Adjustment/Reprogram Two Modules

Labor Hours

3.5 Hours

Part Number

DDE RA4720500633

Parts Return

RETURN
Procedure D1

Labor Number

996-F154D
Drilled Exhaust Rocker Arm Installation/Engine Idle
Adjustment/Reprogram Three Modules

Labor Hours

3.6 Hours

Part Number

DDE RA4720500633

Parts Return

RETURN

1

Administrative time (SRT 939-6010A) for 0.3 hours is automatically added to the claim.

This Field Service Campaign will terminate on October 10, 2024. Dealers will be notified of any changes.
IMPORTANT: OWL must be viewed prior to beginning work to ensure the vehicle is involved and the campaign has
not previously been completed.
All claims must be submitted within 30 days of the repair and within 30 days of the termination date of the campaign.
For questions, U.S. and Canadian dealers can contact the Warranty Campaigns Department via web inquiry at
DTNAPortal.com using the WSC application, or the Customer Assistance Center at (800) 385-4357. Export
distributors should submit a Web inquiry or contact your International Service Manager.

Page 3

Daimler Truck
North America LLC

Field Service Campaign

October 2023
D23M1

**Copy of Notice to Owner**

Detroit Diesel Corporation
13400 Outer Drive, West
Detroit, Michigan 48239-4001
Telephone: 313-592-5000

Subject: Field Service Campaign D23M1 Drilled Exhaust Rocker Arm
Installation
Daimler Trucks North America LLC, on behalf of its Detroit Diesel Powertrain Division, is initiating Field
Service Campaign D23M1 to modify the vehicles mentioned above.
Some vehicles have experienced valve bridge failures due to wear from lack of lubrication to the adjusting screw
on the exhaust rocker arm. A new drilled exhaust rocker arm became effective with engines manufactured in
March of 2022. The drilled rocker arm utilizes an oil drilling to feed oil to the adjusting screw which reduces the
failure mode described above.
Records indicate that your vehicle has one of the eligible engines. Instructions for this Field Service
Campaign have been sent to your local Daimler Truck Authorized Repair Facility, and the labor time required
to perform this campaign is approximately 3.6 hours.
Please contact a Daimler Truck Authorized Repair Facility and arrange to have the Field Service Campaign
performed. To locate an authorized facility, search online at https://demanddetroit.com/find-a-dealer/
You must make an appointment with the repair facility at least two weeks in advance of the actual
repair so the repair facility can order and receive the required parts for the Field Service Campaign.
Failure to provide advance notification to the repair facility may result in a delayed repair.
This service will be completed for you at no charge, prior to October 10, 2024, under the provisions of this
notice.
You may be liable for any progressive damage that results from failure to complete campaigns within a
reasonable time after receiving notification.
We are sorry to cause you this inconvenience however, we have taken this action in the interest of your
continued satisfaction with our products.
DETROIT WARRANTY CAMPAIGNS DEPARTMENT
Enclosure

Page 4

Daimler Truck
North America LLC

Field Service Campaign

October 2023
D23M1

Work Instructions
Subject: Drilled Exhaust Rocker Arm Installation
Models Affected: Specific 2022 and 2023 Freightliner and Western Star vehicles, powered with DETROITTM Gen 5
DD15 Engines manufactured December 14, 2020, through March 10, 2022

Corrective Procedure
Replacement of the Exhaust Rocker Arms
This procedure is for replacing the exhaust rocker arms.

Tool Number

Service Tools Used in the Procedure
Tool Name