Customer Satisfaction Program
N192264211 Enable Diesel Engine Block Heater – US Only
Release Date:

January 2020

Revision:

01

Revision Description: This bulletin is being revised to update the service procedure.
Please discard all previous copies of bulletin N192264211.
Attention:

ONLY Chevrolet Medium Duty dealers can complete this recall repair.
This program is in effect until November 30, 2021.

Make
Chevrolet

Model
Silverado 4500/5500/6500

Model Year
From
To
2019
2019

RPO
L5D

Description
6.6L, 8-cylinder diesel engine

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 2019 model year Silverado 4500/5500/6500 vehicles, equipped with the 6.6 liter Duramax diesel
engine (RPO L5D) and optional engine-block heater cord, may have a condition in which the block heater
cable function was disabled or the customer was advised to not use this feature.
Dealers will replace the engine block heater.

Parts
Quantity
1
2

Part Name

Part No.

Element - Engine Coolant Heater
Dex-Cool Engine Coolant

12705875
12346290

Parts required to complete this repair are to be obtained from General Motors Customer Care and Aftersales (GMCC&A).
Please refer to your “involved vehicles listing” before ordering parts. Order parts on a CSO = Customer Special Order
only. DRO’s may be cancelled. Place the VIN # in the notes field of the order. If there is no VIN or the VIN doesn’t
fit a VIN on this population your order will be cancelled. All orders will be reviewed prior to being filled with customers
sold vehicles having priority.
It is estimated that only 2818 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.
Note: The per gallon part number for coolant is listed in the part table. If your facility buys the correct coolant in a bulk
quantity, do not order the gallon units.
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
9104731

Description
Install Revised Engine Coolant Heater Element (includes remove
shrink tube)

Copyright 2020 General Motors. All Rights Reserved.

Labor
Time
1.0

Trans.
Type
ZFAT

Net
Item
N/A

Page 1 of 5

Customer Satisfaction Program
N192264211 Enable Diesel Engine Block Heater – US Only
Service Procedure
Danger: When performing the following repairs, ensure the engine and coolant are at room temperature. When
removing the engine block heater, the coolant in the engine will drain out. This coolant may injure the technician
if the coolant is hot.
Note: Some vehicles may have had the engine coolant heater power cord sealed and secured at the time of manufacture
or under a previous campaign. If the heater power cord is not sealed and secured, proceed directly to step #4.

5340516

1.

From underneath the vehicle, locate the engine coolant heater power cord. It is on the front passenger side of the
engine block. Cut the wire tie securing the engine block heater power cable. Remove and discard the wire tie. (shown
without the shrink tube installed).

5495374

TIP: A seam ripper is a good example of the type of tool used in the following step.

Page 2 of 5

Customer Satisfaction Program
N192264211 Enable Diesel Engine Block Heater – US Only

5415696

2.

Using an appropriate cutting tool, carefully slice the shrink tube from the power cord. Use care to cut away from the
harness itself to ensure that you do not cut into the harness or body of the connector.

3.

Inspect the connector cavities and mating surface for any heat shrink tube adhesive. Carefully remove the adhesive
if required.

Note: It is not necessary to drain the radiator. The engine block coolant will be drained when the engine coolant heater
is removed.
4.

Place a large drain pan under the work area. Remove the engine coolant heater. Refer to Engine Coolant Heater
Replacement (L5D) in SI.

5.

After removing the original block heater, take care to remove the old cured thread sealant in the block. Failure to
remove the old thread sealant will result in cross threading the replacement block heater.

Note: The new engine coolant heater element has the thread sealer applied at the time of manufacture. DO NOT INSTALL
ADDITIONAL SEALER to the threads.
6.
7.

Hand start the block heater carefully and secure at least 3 full turns before further tightening with a socket wrench.
Install the replacement engine coolant heater. Refer to Engine Coolant Heater Replacement (L5D) in SI.

5420813

8.
9.

Plug the engine coolant heater cord assembly into the heater and secure it with the metal clip. Be certain the metal
retaining clip is secured onto to the deeper of the two grooves.
Fill the cooling system. Refer to Cooling System Draining and Filling (Vac N Fill) in SI.

Page 3 of 5

Customer Satisfaction Program
N192264211 Enable Diesel Engine Block Heater – US Only
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
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 November 30, 2021. 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 followup 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 November 30, 2021, you must take the steps necessary to be sure the program correction has been made before
selling or releasing the vehicle.
Dealer Reports
For dealers with involved vehicles, a listing with involved vehicles has been prepared and will be provided to U.S. and
Canadian dealers through the GM GlobalConnect Recall Reports or sent directly to export dealers. The listing may
contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor
vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in
several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to
complete this program.
Customer Notification
USA - General Motors will notify customers of this program on their vehicle (see copy of customer letter included with this
bulletin).

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 4 of 5

Customer Satisfaction Program
N192264211 Enable Diesel Engine Block Heater – US Only
November 2019
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
Our records indicate that the engine-block heater in your 2019 model year Chevrolet Silverado 4500/500/6500 is
currently deactivated. The engine-block heater in your vehicle was deactivated in order to prevent a short-circuit
condition from developing in the engine-block heater cable or in the terminals that connect the heater cable to the block
heater.
We are now ready to activate your vehicle’s engine-block heater by replacing the heater.
What We Will Do: Your GM dealer will replace the engine block heater. This service will be performed for you at no
charge until November 30, 2021. 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.
Division
Puerto Rico – English
Puerto Rico – Español
Virgin Islands
GM Medium Duty Truck

Number
1-800-496-9994
1-800-496-9993
1-800-496-9994
1-800-862-4389

Text Telephones (TTY)

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 Silverado provides you many miles
of enjoyable driving.
Neelie O’Connor
Executive Director
North America Contact Center Operations
N192264211

Page 5 of 5

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5309
URGENT - DISTRIBUTE IMMEDIATELY
Date:

January 30, 2020

Subject: N192264211-01 - Customer Satisfaction Program
Enable Diesel Engine Block Heater
Models: 2019 Chevrolet Silverado 4500/5500/6500
Equipped with 6.6L Duramax Diesel (RPO L5D)
To:

All General Motors Medium Duty Dealers

Parts required to complete this repair are to be obtained from General Motors
Customer Care and Aftersales (GMCC&A). Please refer to your “involved
vehicles listing” before ordering parts. Order parts on a CSO = Customer Special
Order only. DRO’s may be cancelled. Place the VIN # in the notes field of the
order. If there is no VIN or the VIN doesn’t fit a VIN on this population your order
will be cancelled. All orders will be reviewed prior to being filled with customers
sold vehicles having priority.
This bulletin is being revised to update the service procedure. Please discard
all previous copies of bulletin N192264211.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS