NHTSA ID Number: 10163227
Manufacturer Communication Number: 18NA150
TSB/Document Date: 2019-07-29
Summary
This informational bulletin provides information on 6.6L Duramax Possible Oil Leak Path Information.
Service Bulletin
Bulletin No.:
18-NA-150
Date:
June, 2019
INFORMATION
Subject:
Brand:
6.6L Duramax Possible Oil Leak Path Information
Model:
Model Year:
VIN:
from
to
Silverado
2017
2018
Silverado
2500/3500
2019
2020
Sierra
2017
2018
Sierra
2500/3500
2019
2020
from
to
Engine:
L5P, L5D
Involved Region or Country
North America, Middle East, Israel, South America and Thailand.
Additional Options (RPOs)
Equipped with 6.6L Diesel Engine (RPO L5P)
This document is to help identify where to look for an oil
leak on the 6.6 Duramax engine.
Note: Please keep in mind that a leak on the top of the
engine will trail down the back side of the engine and
appear as a rear cover leak.
Copyright 2019 General Motors
LLC. All Rights Reserved.
All
Page 2
June, 2019
Bulletin No.: 18-NA-150
Please use the illustrations below as a guide of where
to look for a potential oil leak.
Possible Oil Leak Paths
5053868
Legend
(1)
(2)
(3)
(4)
(5)
(6)
(7)
GASKET, VLV RKR ARM CVR (Rocker
Cover Gasket)
GASKET, CYL HD (Head Gasket)
SENSOR, ENG OIL PRESS (Oil
Pressure Sensor)
PLUG, ENG BLK OIL GAL (Plugs in
Block Qty 4)
SEAL, OIL LVL IND TUBE (O-Ring on
Oil Indicator Tube)
SEAL, ENG OIL LVL IND SW (Oil Level
Sensor)
SEAL, OIL PAN DRN PLUG (Oil
Drain Plug)
5053869
Plugs and Gaskets in Oil Cooler and Filter
Bulletin No.: 18-NA-150
June, 2019
5053871
Ghost view of the Oil Cooler Cover to reveal 2 O-rings
(SEAL, ENG OIL CLR).
5053872
Legend
(1)
(2)
GASKET, TURBO OIL FEED PIPE
(Turbo Oil Feed Pipe into Block, Turbo
Pipe removed for picture only)
PLUG, ENG BLK OIL GAL (Section cut
through Flywheel housing to show 2
plugs on the back of the engine block )
Page 3
5053874
Legend
(1)
GASKET, TURBO OIL RTN PIPE (Turbo
Oil Drain Pipe Gaskets (Quantity 3))
Page 4
June, 2019
Bulletin No.: 18-NA-150
5053875
Legend
(1)
(2)
(3)
SEAL, OIL FIL CAP (Oil Separator
Gaskets)
GASKET, TURBO OIL FEED PIPE
(Turbocharger Oil Gasket (2) )
PLUG, CYL HD OIL GAL (Upper Oil
Pan Plug)
5053879
5053878
Legend
(1)
(2)
PLUG, ENG BLK OIL GAL (Oil
Gallery Plug)
RTV (Oil Pan Seals)
Legend
(1)
(2)
RTV (Front Cover Seal)
SEAL, CR/SHF FRT OIL (Front
Bearing Seal)
Bulletin No.: 18-NA-150
June, 2019
Page 5
5053880
Note: (Flywheel Housing has been removed for clarity
of picture)
Legend
(1)
(2)
RTV (Flywheel Housing Seal)
SEAL, CR/SHF RR OIL (Rear
Bearing Seal)
Version
3
Modified
Released May 04, 2018
Revised July 25, 2018 - Added the 2019 Model Year.
Revised June 24, 2019 - Added 2500/3500 to Models and 2020 to Model Year section.
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
- Formulated for engines with 75,000 miles or more, Valvoline...
- Delivers 20% better wear protection and 15% better sludge...
- Extra detergents safeguard against friction, corrosion and...
- Advanced friction-fighting additives help maximize...
- Provides performance benefits for high mileage, new and...
- Advanced protection against the four main causes of engine...
- Delivers 40% stronger wear protection than industry...
- Provides 15% better deposit defense vs. industry standards...
- Up to 2.5X better heat protection vs. industry standards to...
- Engineered for excellent low-temperature flow, reducing...
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: 18NA150
Replacement Service Bulletin Number:
MFR Communication Date: 2019-06-24
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [2026 Top-Tier Hardware and Software Upgrade]: Topdon ArtiDiag900 Lite scanner has enhanced hardware and latest features, including Android 11.0, 5x faster CPU, 10000mAh battery for 12 hours of continuous operation, stable wireless diagnosis with Bluetooth 5.0, 8-inch touchscreen. Added bi-directional control, wireless diagnosis, battery testing (optional), and DTC repair guide
- [TOPDON Bidirectional Scan Tool]: This bidirectional obd2 scanner sends commands to the vehicle's ECU for active testing, enabling users to accurately and quickly locate faulty components such as injectors, coolant pumps, windows, wipers, headlights, mirrors, etc. The bidirectional control scanner is the ideal choice for workshops/automotive repair shops as it significantly reduces mechanic's diagnostic time.
- [Wireless Bluetooth Diagnostic Experience]: The AD900 Lite scan tool comes with a Bluetooth 5.0 VCI, supporting a wireless diagnostic range of up to 33 feet (10 meters), allowing you to diagnose without being confined to cables or tight spaces. Stable and fast wireless diagnosis provides a comfortable repair environment. It also offers VCI cables to increase connectivity options.
- [DTC Repair Guide Function]: Easily diagnose issues with your vehicle and receive guidance on repairs with the topdon scan tool's fault code definitions for all systems,maximize your diagnostic capabilities. This function is compatible with Chrysler
/Dodge/Jeep/Fiat 2010-2014 and expanding with continual updates,the AritDiag 900 Lite car diagnostic scanner is the must-have tool for any technician or DIY enthusiast. - [OE-Level Full System Diagnostics]:AritDiag900 Lite full system diagnostic scanner can scan ALL available modules(Engine, Transmission, Airbag, ABS, ESP, TPMS, Gateway, Steering, Radio, Air conditioning, ect.) to✔read ECU info, ✔read/clear codes, ✔view live data stream, ✔retrieves freeze-frame, ✔perform active tests, and more. With just a simple click, it provides you with accurate and in-depth diagnostics.
- Bi-Directional Control, Quickly Locate Problems: Turn your phone into a professional diagnostic tool. You can send commands from your phone to the ECU to test injectors, cooling fans, headlights, A/C clutch, windows, wipers, and more. See which one doesn't respond. Helps you quickly locate the problem and save time. No need to tear things apart, avoid blind disassembly.
- Flexible Subscription, Choose Advanced Features as Needed: TopScan Lite provides free-for-life access to core diagnostics, including full system scan, code reading, performance tests, and repair information. After purchase, advanced features (bi-directional control, service operations, live data, code clearing, and AI functions) are free-for-the-first-year. After the first year, if you want to use advanced features, you need to subscribe on a monthly, quarterly, or yearly basis. As new models and reset functions are updated, the tool will also be continuously upgraded.
- Full System Diagnostics, No Fault Hides: Unlike basic diagnostic tools that only cover 4 systems, TopScan can scan all systems. Read and clear trouble codes, view live data streams, and generate a complete vehicle health report – all issues are clear at a glance. Covers 10,000+ vehicle models and is compatible with 99.99% of vehicles.
- AI Assistant - TopFix: Think of TopFix as your personal AI mechanic. It leverages a repair database and OEM data to deliver clear, step-by-step repair solutions. Features include AI Q&A, one-click translation, and a full repair log, making your diagnostic process simpler and more efficient.
- 8+ Hot Resets, Keep Your Car in Top Shape: One-tap resets for oil, throttle, EPB, steering angle, DPF, ABS, BMS, and airbag. It enables car owners to easily perform essential maintenance, ensuring the vehicle stays in optimal condition and extends its service life.
- Dual WiFi & 10.1" Touchscreen: Provides a stable, high-speed wireless link 3x faster than bluetooth, and a responsive, professional interface. Topdon ONE obd2 scanner diagnostic tool ensures smooth, non-lagging diagnostic scan, boosting mechanic efficiency
- J2534 Pass-Thru Support: The included ONE VCI supports the J2534 standard, allowing it to function as a pass-thru device when paired with OEM diagnostic software.Through TOPDON’s RLink platform, technicians can perform dealer-level coding, expanding in-house capabilities without investing in multiple factory automotive scan tools
- OE Topology Mapping: Visualize the vehicle’s ECU network exactly as it’s built.Zoom, pan, and highlight specific modules to pinpoint component issues with precision.Topology mapping displays real-time communication between modules
- 50 Plus Service Functions: Covers high-demand services like ADAS calibration, DPF regen, TPMS reset, ABS bleed, and throttle adaptation.Expands your service menu, allows you to charge premium rates, and turns away zero jobs due to lack of tooling. Vehicle-specific functionality may vary
- Advaned ECU Coding: 10 of the most serviced brands in North America, including full ECU coding and flash hidden support for BMW, VW, Au-di, Benz, Porsche, Toyota, Ni ssan and more. Enables module replacement, feature customization, and personal settings with automatic backup or restore.Lets your shop safely offer high-margin customization services, attracting more customers and boosting profit
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.