23-NA-011
Service Bulletin Details
Public Details for: 23-NA-011
This informational bulletin advises the technician of possible areas the oil may leak from the engine.
Models from 2023
2023 CADILLAC ESCALADE |
2023 CADILLAC ESCALADE ESV |
2023 CHEVROLET SILVERADO 1500 |
2023 CHEVROLET SUBURBAN |
2023 CHEVROLET TAHOE |
2023 GMC SIERRA 1500 |
2023 GMC YUKON |
2023 GMC YUKON XL |
Models from 2022
Models from 2021
Models from 2020
2020 CHEVROLET SILVERADO 1500 |
2020 GMC SIERRA 1500 |
Bulletin No.: Service Bulletin Date: 23-NA-011 February, 2023 INFORMATION Subject: 3.0L Duramax Possible Oil Leak Path Information Model Year: Brand: Model: Cadillac Escalade Models 2021 Silverado 1500 2020 Suburban 2021 Tahoe 2021 Sierra 1500 2020 Yukon Models 2021 Chevrolet GMC from to 2023 VIN: from to Engine: Transmission: LM2, LZ0 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. Copyright 2023 General Motors LLC. All Rights Reserved. Page 2 February, 2023 Bulletin No.: 23-NA-011 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. Possible Oil Leak Paths 6262592 1. 2. 3. 4. 5. 6. 7. 8. Oil Filler Neck Seal Oil Galley Plugs Oil Pan Drain Plug Oil Indicator Tube Seal Oil Pan Gasket Engine Bed-Plate Gasket Cylinder Head Gasket Valve Rocker Arm Cover Gasket 6262643 Ghost view of the Oil Cooler Cover to reveal the seal. Bulletin No.: 23-NA-011 February, 2023 Page 3 6262632 1. 2. 3. 4. 5. 6. Oil Pressure Sensor Oil Temperature Sensor Oil Galley Plug Oil Pump Solenoid Valve Connector Oil Filter Seal Oil Drain Plug 1. 2. 3. 4. 5. Valve Rocker Arm Cover Gasket Upper and Lower Turbo Return Line Seals Cylinder Head Gasket Lower Turbo Feed Line Seal Tensioner Timing Chain 6262637 Page 4 February, 2023 Bulletin No.: 23-NA-011 6262662 Upper Turbo Oil Supply Line Seal. 6262659 1. 2. 3. 4. 5. 6. Cover Timing Chain Camshaft Sensor Oil Gallery Plugs Timing Chain Cover Lower Seal Rear Crankshaft Seal Fuel Pump Cover Bulletin No.: 23-NA-011 February, 2023 Page 5 6262626 1. 2. 3. 4. 5. Oil Filler Neck Seal Upper Oil Galley Plug Front Crank Shaft Seal Front Cover Seal Lower Oil Gallery Plug Version 1 Modified Released February 06, 2023 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION