NHTSA ID Number: 11006714
Manufacturer Communication Number: 23-NA-011
TSB/Document Date: 2024-08-30
Summary
This Informational bulletin advises the technician of possible areas the oil may leak from the engine.
Bulletin No.: 23-NA-011
Service Bulletin
Date: August, 2024
INFORMATION
Subject:
Brand:
3.0L Duramax Possible Oil Leak Path Information
Model:
Model Year:
from
to
Escalade Models
2021
2024
Silverado 1500
2020
Suburban
2021
Tahoe
2021
Sierra 1500
2020
Yukon Models
2021
2025
VIN:
from
Engine:
to
LM2, LZ0
2025
Involved Region or Country
North America
Condition
Some customers may comment on an oil leak from the engine.
Information
This document is to help identify where to look for an oil leak on the 3.0 Duramax engine.
Please use the illustrations below as a guide of where to look for a potential oil leak.
These Illustrations are of a LZ0 engine; the LM2 would be similar.
Important: Service agents must comply with all
International
, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict
between the procedures set forth in this bulletin
and the laws that apply to your dealership, you
must follow those applicable laws.
Copyright 2024 General Motors. All Rights Reserved.
Page 2
August, 2024
Bulletin No.: 23-NA-011
Possible Oil Leak Paths
6262592
Ghost view of the Oil Cooler Cover to reveal the seal.
1. Oil Filler Neck Seal
2. Oil Galley Plugs
3. Oil Pan Drain Plug
4. Oil Indicator Tube Seal
5. Oil Pan Gasket
6. Engine Bed-Plate Gasket
7. Cylinder Head Gasket
8. Valve Rocker Arm Cover Gasket
6262632
1. Oil Pressure Sensor
2. Oil Temperature Sensor
3. Oil Galley Plug
4. Oil Pump Solenoid Valve Connector
5. Oil Filter Seal
6. Oil Drain Plug
6262643
Bulletin No.: 23-NA-011
August, 2024
Page 3
6262637
1. Valve Rocker Arm Cover Gasket
Upper Turbo Oil Supply Line Seal.
2. Upper and Lower Turbo Return Line Seals
3. Cylinder Head Gasket
4. Lower Turbo Feed Line Seal
5. Tensioner Timing Chain
6262662
Page 4
August, 2024
Bulletin No.: 23-NA-011
6262659
1. Cover Timing Chain
4. Timing Chain Cover Lower Seal
2. Camshaft Sensor
5. Rear Crankshaft Seal
3. Oil Gallery Plugs
6. Fuel Pump Cover
4. Front Cover Seal
2. Upper Oil Galley Plug
5. Lower Oil Gallery Plug
6262626
3. Front Crank Shaft Seal
Version
3
Modified
Released February 06, 2023
Revised August 02, 2023 - Added the 2024 Model Year.
Revised August 09, 2024 - Added 2025 to Model Year.
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 equipment, tools, 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 GM dealer for information on whether your vehicle may benefit from the
information.
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TSB/Document ID: 23-NA-011
Replacement Service Bulletin Number:
MFR Communication Date: 2024-08-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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