Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater
Release Date:
Revision Description:

Attention:

January 2020

Revision:

01

This bulletin is being revised to update the service procedure for inventory vehicles.
Please discard all previous copies of bulletin N192264210.

The pre-shipped kits are being sent to dealers in the following northern/cold weather areas: Alaska,
Colorado, Idaho, Maine, Michigan, Minnesota, Montana, North Dakota, New Hampshire, New York,
South Dakota, Vermont, Wisconsin, Wyoming and Canada.
This program is in effect until November 30, 2021.

Make
Chevrolet
GMC

Model
Silverado 2500/3500
Sierra 2500/3500

Model Year
From
To
2017
2019
2017
2019

RPO
L5P
L5P

Description
6.6L, 8-cylinder, diesel engine
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 2017 - 2019 model year Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 vehicles,
equipped with the 6.6l Duramax diesel engine (RPO L5P) and optional engine-block heater cord, may
have a condition in which the block heater cable function was disabled.
Dealers will replace the engine block heater and cord.

Parts
Quantity
1
2

Part Name
Kit - Engine Block Coolant Heater (contains engine coolant heater element
and power cord)
Dex-Cool Engine Coolant

4

Locally Sourced Automotive Quality Wire Tie

Part No.
19419326
12346290 US
10953464 Canada
Obtain locally in
compliance w/ GM spec
GMW3420 and Material
Specification 9985809
(all other countries)
NPN

Important: An initial supply of part 19419326 will be pre-shipped in a Fair Share Allocation based on all impacted VINS
of the Dealers registered in States: Alaska, Colorado, Idaho, Maine, Michigan, Minnesota, Montana, New York, North
Dakota, New Hampshire, South Dakota, Vermont, Wisconsin, Wyoming and Canada. This pre-shipment started the week
of 10/1/19 and will continue for several weeks. Additional States will be added as parts become available, currently limited
supply of parts. Pre-shipped parts will be charged to dealer's open parts account. All orders placed prior to and during
the pre-ship will be cancelled. A quantity limiter may be in effect.
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: Due to limited initial parts availability, dealers are encouraged not to order these parts for use as shelf stock.
Warranty Information
Labor
Operation
9104743

Description
Install Revised Engine Coolant Heater Element and Cord
ADD: Remove Existing Engine Coolant Heater Power Cord

Labor
Time
1.3
0.1

Trans.
Type
ZFAT

Net
Item
N/A

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 block heater power cord removed under a previous campaign. If the power
cord has been removed, proceed directly to step #3.
Copyright 2020 General Motors. All Rights Reserved.

Page 1 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater
1.

Raise the hood and locate the engine heater power cord (bundled at the right-side front of dash area).

NOTE: Some attachment points may use tape to secure the power cord to the vehicle wiring harness. Use care to not cut
the vehicle wiring harness when removing these attachment points
2.

Locate and remove all of engine compartment power cord attachment points. Route the engine heater power cord
assembly to the underside of the vehicle and let it drop.

3.

Raise the vehicle and remove the right front wheel. Refer to Tire and Wheel Removal and Installation (8-Lug Wheel)
in SI.

5420809

4.

Looking through the area between the wheel house liner and the suspension, locate the engine block heater.

5.

Disconnect the engine block heater plug from the heater element by releasing the retainer clip and unplugging.

6.

Remove any existing engine heater power cord fasteners and remove the power cord. Discard the power cord.

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

5420812

7.

Place a large drain pan under the vehicle to capture the coolant. Remove the engine coolant heater. Refer to Engine
Coolant Heater Replacement (L5P) in SI.

8.

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 block heater element has the thread sealer applied at the time of manufacture. DO NOT INSTALL
ADDITIONAL SEALER to the threads.
9. Hand start the block heater carefully and secure at least 3 full turns before further tightening with a socket wrench.
10. Install the replacement engine coolant heater. Refer to Engine Coolant Heater Replacement (L5P) in SI.

Page 2 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater

5420813

11. Plug the new 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.

5420814

Page 3 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater

5495375

12. Route the new engine coolant heater power cord (red) to the upper motor compartment. Secure the power cord to
the existing wiring harness with a wire tie as shown. Begin at the Element (1) and secure the wire tie (2) around the
negative battery cable (black) and the engine chassis harness (grey).
13. Reinstall the right front wheel and tire. Refer to Tire and Wheel Removal and Installation (8-Lug Wheel) in SI.
14. Lower the vehicle.

5495378

15. Route the power cord as shown and secure to the surge tank hose (blue) with a wire tie.
Engine Compartment Routing Overview

Page 4 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater

5495382

Push pin attachments (1), wire tie attachments (2).

5420816

16. Position the power cord along the inner fender and secure to the existing hole using the first (closest to the heater
element) push pin wire tie attached to the harness.

5420817

17. Secure the power cord to the fender flange with a wire tie as shown. Some vehicles may have a hood seal or
headlamp attachment at this location. Position the wire the under the seal/bracket.

Page 5 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater

5420818

18. Locate the drill location on the front compartment site-shield. Mark the location.

5420819

19. Drill a 5mm (13/64 in.) hole in the marked area. Use care to not damage components below the drill location.
20. Route the power cord from the fender flange area under the front compartment site shield.

5420820

21. Create a gentle bend in the power cord and place the power cord plug over the hole in the site shield. Ensure the
prongs on the power cord plug are facing toward the right fender.

Page 6 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater

5420823

22. Secure the power cord plug to the to the front compartment shield with a wire tie as shown.

5420824

23. Locate the hole on the passenger side upper tie bar bracket.

5420825

24. Position the harness up under the front compartment site shield and secure it using the second (closest to the
electrical plug) push pin wire tie on the harness.
25. Trim all wire ties as necessary.
26. Fill the cooling system. Refer to Cooling System Draining and Filling (Vac N Fill) in SI.

Page 7 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater
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.
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, Sections 1.4 and 6.1.10, 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 8 of 9

Customer Satisfaction Program
N192264210 Enable Diesel Engine Block Heater
November 2019
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
Our records indicate that the engine-block heater in your 2017 – 2019 model year Chevrolet Silverado 2500/3500 or
GMC Sierra 2500/3500 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 and the related cord.
What We Will Do: Your GM dealer will replace the engine-block heater and cord. 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
Chevrolet
GMC
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-222-1020
1-800-462-8782
1-800-496-9994
1-800-496-9993
1-800-496-9994

Text Telephones (TTY)
1-800-833-2438
1-800-462-8583

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 provides you many
miles of enjoyable driving.
Neelie O’Connor
Executive Director
North America Contact Center Operations
N192264210

Page 9 of 9

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5308
URGENT - DISTRIBUTE IMMEDIATELY
Date:

January 30, 2020

Subject: N192264210-01 – Customer Satisfaction Program
Enable Diesel Engine Block Heater
Models: 2017 – 2019 Chevrolet Silverado 2500/3500
2017 – 2019 GMC Sierra 2500/3500
Equipped with 6.6L, 8-cylinder diesel engine (RPO L5P)
To:

All General Motors Dealers

DO NOT ORDER PARTS
Parts are being pre-shipped to select dealers only. Pre-shipped parts will be
charged to dealer's open parts account. All orders placed prior to and during the
pre-ship will be cancelled. A quantity limiter may be in effect
This bulletin is being revised to update the service procedure ONLY.

END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS