GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6571
URGENT - DISTRIBUTE IMMEDIATELY
Date:

May 17, 2023

Subject: N232395830 - Customer Satisfaction Program
Camshaft Ladder Frame
Models: 2023 Chevrolet Silverado 1500
2023 GMC Sierra 1500
2023 GMC Yukon

To:

All General Motors Dealers

General Motors is releasing Customer Satisfaction Program N232395830
today. The total number of U.S. vehicles involved is approximately 13. Please
see the attached bulletin for details.
Customer Letter Mailing
The customer letter mailing will begin on May 31, 2023.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will
be updated May 17, 2023. A Stock VIN list is not included as our records show there
are no vehicles in dealer new inventory.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Customer Satisfaction Program
N232395830 Camshaft Ladder Frame
Release Date:
Attention:

Make
Chevrolet
GMC
GMC

May 2023

Revision:

00

This program is in effect until May 31, 2025.

Model
Silverado 1500
Sierra 1500
Yukon

Model Year
From
To
2023

RPO

Description

2023

Involved vehicles are marked “Open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition
Correction

Certain 2023 model year Chevrolet Silverado 1500, GMC Sierra 1500 and Yukon vehicles, may have a
condition in which the overhead camshaft ladder assembly was mis-built and installed on the engine.
Dealers will replace the engine.

Parts
Quantity
1
3
4
1
1
1
1
2
1
1
4
6
1
1
1
1
1
1
1
1
2
1
1
1
1
1
3
2
1
7
5
1*
1*
1*
As Req
As Req
As Req

Part Name
LZ0
LZ0 Engine Assembly
SEAL-A/C CNDSR
SEAL-A/C EVPR TUBE
SEAL-A/C CMPR TUBE
CLAMP ASM-CTLTC CONV
GASKET-CTLTC CONV
CLAMP-EMIS RDCN FLUID INJR
GASKET-ENG COOL THERM
GASKET-ENG COOL THERM
GASKET-ENG COOL THERM HSG
BOLT/SCREW-ENG MT BRKT
BOLT/SCREW-ENG MT FRM SI
GASKET-EGR CLR INL PIPE
GASKET-EGR CLR INL PIPE
GASKET-EGR CLR INL PIPE
GASKET-EGR OTLT PIPE
SEAL-EGR PIPE (O RING)
GASKET-EGR VLV CLR
GASKET-EXH MANIF
GASKET-EXH SYS FRT
GASKET-EXH SYS FRT
GASKET KIT-INT MANIF
FILTER ASM-OIL
SEAL-OIL LVL IND TUBE (O RING)
GASKET-TURBO COOL FEED & RTN PIPE
GASKET-TURBO
NUT-CTLTC CONV
GASKET-TURBO OIL RTN PIPE
CLAMP-TRFER CASE FRT OUTPUT SHF BOOT
OIL-ENG
COOLANT
SEALANT-RTV SILICONE
ADHESIVE,THREADLOCKER
ADHESIVE,THREADLOCKER
FLUID-A/TRANS
LUBRICANT-A/C SYSTEM
Refrigerant - A/C
LM2

Copyright 2023 General Motors. All Rights Reserved.

Part No.
12731655
13579649
13579648
13579646
55503171
55494570
12670035
55496955
55496954
55496127
11604169
11603876
55497083
55496995
55496996
55496936
55496593
55490621
55507833
84763642
55494714
55503127
12727115
12670252
55496956
55512949
11588835
40009034
84308104
19370138
12346290
19369831
19333511
19369733
19352619
19354657
19260234

Page 1 of 4

Customer Satisfaction Program
N232395830 Camshaft Ladder Frame
1
4
3
1
1
1
1
3
1
1
4
6
3
1
1
1
1
1
1
1
1
1
2
2
1
3
2
7
6
1*
1*
1*
As Req
As Req
As Req

LM2 Engine Assembly
SEAL-A/C CNDSR
SEAL-A/C EVPR TUBE
SEAL-A/C CMPR TUBE
CLAMP ASM-CTLTC CONV
GASKET-CTLTC CONV
CLAMP-EMIS RDCN FLUID INJR
GASKET-ENG COOL THERM
GASKET-ENG COOL THERM
GASKET-ENG COOL THERM HSG
BOLT/SCREW-ENG MT BRKT
BOLT/SCREW-ENG MT FRM SI
GASKET-EGR CLR INL PIPE
SEAL-EGR PIPE (O RING)
GASKET-EGR VLV CLR
GASKET-EGR VLV INL
GASKET-EXH MANIF
GASKET-EXH SYS FRT
GASKET-EXH SYS FRT
GASKET KIT-INT MANIF
FILTER ASM-OIL
SEAL-OIL LVL IND TUBE (O RING)
SEAL-TRANS FLUID CLR
GASKET-TURBO COOL FEED & RTN PIPE
GASKET-TURBO
NUT-CTLTC CONV
GASKET-TURBO OIL RTN PIPE
OIL-ENG
COOLANT-ENGINE
SEALANT-RTV SILICONE
ADHESIVE,THREADLOCKER
ADHESIVE,THREADLOCKER
LUBRICANT-A/C SYSTEM
Refrigerant - A/C
FLUID-A/TRANS

40009412
13579649
13579648
13579646
55503171
55494570
55506825
55496955
55496954
55496127
11604169
11603876
55497083
55496593
55490621
55508537
55507833
55494714
84763642
55503127
12727115
12670252
85628208
55497445
55512949
11588835
40009034
19370138
12346290
19369831
19333511
19369733
19354657
19260234
19352619

It is estimated that only 14 involved vehicles will require parts replaced. Due to the small number of vehicles
anticipated that will need this fix and the limited initial parts availability, dealers are encouraged not to order
these parts for use as shelf stock.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts to
confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9106747

Description
Silverado/Sierra 2WD
Silverado/Sierra 4WD
Yukon
Add: Recover and Recharge R1234YF

Labor
Time
24.5
25.5
25.7
1.2

Trans.
Type

Net
Item
*

ZFAT

*The amount identified in “Net Item” should represent the actual sum total of the current GM CCA Dealer net price for
threadlocker and silicone sealant needed to perform the required repairs, not to exceed $4.99 USD, $6.64 CAD.
Service Procedure
Replace the engine. Refer to Engine Replacement (2WD) or Engine Replacement (4WD) in SI.
Dealer Responsibility
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this program must be held and inspected/repaired per the service procedure of this bulletin before
Page 2 of 4

Customer Satisfaction Program
N232395830 Camshaft Ladder Frame
customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealertraded, released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle,
or ownership, through May 31, 2025. Customers who have recently purchased vehicles sold from your vehicle inventory,
and for which there is no customer information indicated on the involved vehicle listing, are to be contacted by the dealer.
Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A
copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards
should not be used for this purpose, since the customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory or is in your facility for service
through May 31, 2025, you must take the steps necessary to be sure the program correction has been made before
selling or releasing the vehicle.
Dealer Reports – For USA & Export
For dealers with involved vehicles, a listing has been prepared and will be available through GM GlobalConnect Maxis
Field Action Reports or sent directly to export dealers. The Inventory tab of the dealer reports will contain VINs that
apply to this field action. This information is intended to assist dealers with the PROMPT COMPLETION of these
vehicles. The Customer In-Service tab will contain customer names and addresses from Motor Vehicle Registration
Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete
this field action may be a violation of law in several states.
Courtesy Transportation – For USA & Canada
Courtesy transportation is available for customers whose vehicles are involved in a product program and still within the
warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy transportation
program details.
Customer Notification
USA & Canada - General Motors will notify customers of this program on their vehicle (see copy of customer letter included
with this bulletin).
Export - Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor
Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the attached sample letter.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained
technicians have the tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT
assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

Page 3 of 4

Customer Satisfaction Program
N232395830 Camshaft Ladder Frame
May 2023
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your 2023 model year Chevrolet Silverado 1500, GMC Sierra 1500 or GMC Yukon may have a
condition in which the overhead camshaft ladder assembly was mis-built and installed on the engine.
Your satisfaction with your Silverado 1500, Sierra 1500, Yukon is very important to us, so we are announcing a program
to prevent this condition or, if it has occurred, to fix it.
What We Will Do: Your GM dealer will replace the engine. This service will be performed for you at no charge until
May 31, 2025. After that, any applicable warranty will apply.
What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as
possible to schedule an appointment for this repair. By scheduling an appointment, your dealer can ensure that the
necessary parts will be available on your scheduled appointment date.
If you have any questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer
Assistance Center at the number listed below.
For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication
Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle.
Division
Chevrolet
GMC
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-222-1020
1-800-462-8782
1-866-467-9700
1-866-467-9700
1-866-467-9700

Text Telephones (TTY)
711 / 1-800-833-2438
711 / 1-800-833-2438

We truly appreciate you taking the time to remedy your vehicle as we know your time is valuable. We want you to know
that we will do our best, throughout your ownership experience, to ensure that your GM vehicle you many miles of
enjoyable driving.
Neelie O’Connor
Global Executive Director
Customer Experience Operations

N232395830

Page 4 of 4