GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6806
URGENT - DISTRIBUTE IMMEDIATELY
Date:

February 28, 2024

Subject: N232433290 - Service Update
Engine Block Heater Cord Not Fully Seated
Models: 2024 Chevrolet Silverado 2500HD/3500HD
2024 GMC Sierra 2500HD/3500HD
Equipped with 8-Cylinder Duramax Diesel Engine (RPO L5P)
To:

All General Motors Dealers

General Motors is releasing Service Update N232433290 today. The total
number of U.S. vehicles involved is approximately 321. Please see the
attached bulletin for details.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen has
been updated. Please verify a VIN's involvement by checking in IVH. IVH is the best
source for individual VIN inquiries. A list of vehicles in dealer inventory is attached to
this message.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N232433290 Engine Block Heater Cord Not Fully Seated
Release Date:
Attention:

February 2024

Revision:

00

This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited
Warranty period.

Make
Chevrolet
GMC

Model
Silverado 2500HD / 3500HD
Sierra 2500HD / 3500HD

Model Year
From
To

RPO

2024

L5P

2024

Description
ENGINE-DIESEL, 8 CYL, 6.6L,
DI, V8, TURBO, DURAMAX

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 2024 model year Chevrolet Silverado 2500HD / 3500HD and GMC Sierra 2500HD/3500HD
vehicles may have a condition in which the engine block heater cord may not be fully seated.
Dealers are to inspect the engine block heater connector and retention clip and reinstall if necessary.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9107269
9107270

Description
Inspect Only – No Further Action Required
Remove heater cord, add dielectic grease, and reinstall

Labor
Time
0.3
0.4

Trans.
Type

Net
Item

ZFAT

N/A

Service Procedure
1.

Lift the vehicle. Refer to Lifting and Jacking the Vehicle in SI.

2.

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

6557215

3.

Locate the engine block heater through the opening in the wheel well liner.

Copyright 2024 General Motors. All Rights Reserved.

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Service Update
N232433290 Engine Block Heater Cord Not Fully Seated
4.

Inspect the engine block heater cord to be sure it is securely and evenly fastened into the engine block heater.
•

If the engine block heater is securely and evenly fastened (as step 3 shows), no further action is required.
Proceed to step 8.

6557216

•
5.

If the engine block heater is NOT securely and evenly fastened (the metal ring will be at an angle relative
to the block heater, and one or both sides may not be clipped in) proceed to step 5.

Remove the engine block heater cord from the engine block heater by unclipping the metal fastening ring around
the cable.

6557217

6.

Apply dielectric grease as shown (a light coat applied by hand or brush to the end of the cord).
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Service Update
N232433290 Engine Block Heater Cord Not Fully Seated
7.

Reinstall the engine block heater cord to the engine block heater, being sure to fasten it securely and evenly on both
sides.

8.

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

Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory or is in your facility for service in the
future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be
sure the service update correction has been made before selling or releasing the vehicle.
All new, used, GM Certified Pre-Owned (CPO), courtesy transportation vehicles, dealer shuttle vehicles, CarBravo, etc.
in dealers' possession and subject to this field action 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, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Pre-Owned (CPO) vehicles currently in the dealers’ inventory within the SHIFT Digital system 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 SHIFT Digital system, or once again be used in the Courtesy Transportation Program.
Dealer Reports – For USA & Export
The Inventory tab of the Open Vehicle Report will contain Service Update Bulletin VINs that apply to this field action.
This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer InService tab will not contain Service Update Bulletin VIN data because the intent of a Service Update Bulletin is to not
inconvenience a customer with a special trip for service. Service Update Bulletins are to be completed when the
customer is in for a regularly scheduled visit.

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

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