GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6778
URGENT - DISTRIBUTE IMMEDIATELY
Date:

January 29, 2024

Subject: N232430460 - Special Coverage
Glow Plug – Cylinder 2
Models: 2020 Chevrolet Silverado 1500
2020 GMC Sierra 1500
Equipped with 3.0L Diesel Engine (RPO LM2)
To:

All General Motors Dealers

General Motors is releasing Special Coverage N232430460 today. The total
number of U.S. vehicles involved is approximately 40,000. Please see the
attached bulletin for details.
Customer Letter Mailing
The customer letter mailing will begin in the near future.
Global Warranty Management (GWM)
The Applicable Warranties section on the Investigate Vehicle History (IVH) screen will
be updated January 29, 2024. Please verify a VIN's involvement by checking in IVH.
IVH is the best source for individual VIN inquiries.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Special Coverage
N232430460 Glow Plug – Cylinder 2
Release Date:
Attention:

January 2024

Revision:

00

This Special Coverage can be seen in the Applicable Warranties section in Investigate Vehicle History
(IVH).

Make
Chevrolet
GMC

Model
Silverado 1500
Sierra 1500

Model Year
From
To
2020
2020
2020
2020

RPO
LM2

Description
ENGINE-DIESEL, 6 CYL, 3.0L,
CRI, L6, DOHC, TURBO, VGT,
ALUM, CSS50V, VAR. 1

Involved vehicles are identified on the Applicable Warranties section 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

Special
Coverage

Certain 2020 model year Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles may have a condition
that could cause the engine’s cylinder 2 glow plug to fail. If this condition occurs, the Malfunction Indicator
Lamp (Check Engine Light) will illuminate, and a diagnostic trouble code will set.
This special coverage covers the condition described above for a period of 15 years or 150,000 miles
(240,000 km), whichever occurs first, from the date the vehicle was originally placed in service,
regardless of ownership.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after
January 29, 2024, are covered by this special coverage and must be submitted using the labor operation
codes provided with this bulletin. Claims with repair orders prior to January 29, 2024, must be submitted
to the Service Contract provider.

Correction

Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are
eligible for reimbursement of their reasonable and customary expenses in accordance with the
procedures specified below. The conditional right to reimbursement is provided by GM solely in the
interest of customer satisfaction and is personal to Customers. Customers may not assign and GM
does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to
receive reimbursement, or any other rights granted by this Special Coverage to any third party,
including but not limited to service contract providers, and this Special Coverage is not intended to and
does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to
reimbursement, against GM, whether in law, equity or otherwise, on any third parties.
Dealers are to replace the cylinder 2 glow plug as necessary. The repairs will be made at no charge
to the customer.

Parts
Quantity
1
1

Part Name

Part No.
55490594
55490568

Glow Plug (Cylinder 2)
Throttle Body Gasket

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
9900875
9900876
9900877
9900878

Description
Diagnosis Only (Diagnosis did not lead to #2 glow plug replacement)
Glow Plug Replacement
Add: Diagnosis Time
Customer Reimbursement Approved
- For USA and Canada dealers only
Customer Reimbursement Denied – For USA dealers only

Labor
Time
0.3-1.0
0.7
0.3-1.0
N/A
N/A

Trans.
Type
ZREG
ZREG

Net
Item
N/A
N/A

ZREG

*

ZREG

**

*

For USA and Canada: Submit the dollar amount reimbursed to the Customer in Net/Reimbursement. Submit $20.00
USD ($25.00 CAD) administrative allowance in Net/Admin Allowance.

**

Submit $10.00 administrative allowance in Net/Admin Allowance.

Copyright 2024 General Motors. All Rights Reserved.

Page 1 of 3

Special Coverage
N232430460 Glow Plug – Cylinder 2
Service Procedure
1.

2.

A vehicle may come in with conditions that lead to a diagnosis of glow plug replacement on Cylinder #2. These
conditions may include, but are not limited to, DTCs P0672, P1339, and/or P06C6.
•

If the diagnosis DOES lead to a replacement of the #2 Cylinder Glow Plug, proceed to step 2.

•

If the diagnosis does NOT lead to a replacement of the #2 Cylinder Glow Plug, no further action is
permitted under this special coverage field action. Inform the customer that the diagnosis up to this point
will be covered, but any other diagnosis or repair work must be paid by the customer or a policy
adjustment.

Replace the #2 Cylinder Glow Plug. Refer to Glow Plug Replacement - Cylinder 2 in SI.

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
General Motors will notify Customers of this special coverage on their vehicle (see copy of typical Customer letter included
with this bulletin).
Customer Reimbursement
Customer requests for reimbursement of previously paid repairs to correct the condition described in this bulletin are to
be submitted to the dealer prior to or by February 28, 2025. See General Motors Service Policies and Procedures Manual,
Product Field Action Customer Reimbursement Procedure (USA & Canada) or local Policies and Procedures, for details.

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 2 of 3

Special Coverage
N232430460 Glow Plug – Cylinder 2
February 2024
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
As the owner of a 2020 model year Chevrolet Silverado 1500 or GMC Sierra 1500, your satisfaction with our product is
very important to us.
This letter is intended to make you aware that some 2020 model year Silverado 1500 and GMC Sierra 1500 vehicles,
equipped with a 3.0L engine, may have a condition that could cause the engine’s cylinder 2 glow plug to fail. If this
condition occurs, the Malfunction Indicator Lamp (Check Engine Light) will illuminate, and a diagnostic trouble code will
set.
Do not take your vehicle to your GM dealer as a result of this letter unless you believe that your vehicle has the
condition as described above.
What We Have Done: General Motors is providing owners with additional protection for the condition described above.
If this condition occurs on your 2020 model year Silverado 1500 or GMC Sierra 1500 within 15 years of the date your
vehicle was originally placed in service or 150,000 miles (240,000 km), whichever occurs first, the condition will be
repaired for you at no charge. Diagnosis or repair for conditions other than the condition described above is not
covered under this special coverage program. For customer’s vehicles already outside of the above years and/or miles,
we are still offering reimbursement if the issue occurred within the years and miles stated above. Please follow the
reimbursement steps below.
What You Should Do: If you believe that your vehicle has the condition described above, repairs and adjustments
qualifying under this special coverage must be performed by a General Motors dealer. You may want to contact
your GM dealer to find out how long they will need to have your vehicle so that you may schedule the appointment at a
time that is convenient for you. This will also allow your dealer to order parts if they are not already in stock. Keep this
letter with your other important glove box literature for future reference.
Reimbursement: If you already paid for repairs for the condition described in this letter, and those repairs were
completed prior to this mailing, please complete the enclosed reimbursement form and present it to your dealer with
all required documents. Working with your dealer will expedite your request, however, if this is not convenient, you may
mail the completed reimbursement form and all required documents to Reimbursement Department, PO Box 33170,
Detroit, MI 48232-5170. The completed form and required documents must be presented to your dealer or received by
the Reimbursement Department by February 28, 2025, unless state law specifies a longer reimbursement period.
The right to submit reimbursement claims is provided by GM solely in the interest of customer satisfaction and is
personal to vehicle owners and lessees who previously paid for repairs referenced in this Special Coverage
(“Customers”). Customers may not assign and GM does not consent to any assignment of any Customer’s right
to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special
Coverage to any third party, including but not limited to service contract providers, and this Special Coverage
is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any
other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties.
If you have any questions or need any assistance, please contact your dealer or 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 are sorry for any inconvenience you may experience; however, we have taken this action in the interest of your
continued satisfaction with our products.
Neelie O’Connor
Global Executive Director
Customer Experience Operations
Enclosure
N232430460
Page 3 of 3