NHTSA ID Number: 10183162
Manufacturer Communication Number: 18NA361
TSB/Document Date: 2020-11-30
Summary
This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part.
Bulletin No.:
Service Bulletin
Date:
18-NA-361
October, 2020
TECHNICAL
Subject:
Brand:
Diagnostic Tip for Diesel Fuel System Contamination, Malfunction Indicator Lamp (MIL)
Illuminated - DTC P026D, P2A00, P0171, P0172 and/or P0300 Set
Model:
Model Year:
VIN:
from
Engine:
from
to
Cruze
2014
2015
Cruze
2018
2019
Equinox
2018
2019
Silverado
2017
2018
6.6L Turbo
Diesel (L5P)
Silverado
1500
2020
2021
3.0L
Diesel (LM2)
Silverado
2500/3500
2019
2021
6.6L V-8
Duramax Turbo
Diesel (L5P)
Silverado
4500HD,
5500HD and
6500HD
2019
2021
6.6L V-8
Duramax Turbo
Diesel (L5D)
Sierra
2017
2018
6.6L V-8
Duramax Turbo
Diesel (L5P)
Sierra 1500
2020
2021
3.0L
Diesel (LM2)
Sierra
2500/3500
2019
2021
6.6L V-8
Duramax Turbo
Diesel (L5P)
Terrain
2018
2019
1.6L
Diesel (LH7)
1.6L
Diesel (LH7)
—
Involved Region or Country
North America, Israel
Condition
Some customers may comment that the MIL is illuminated.
Copyright 2020 General Motors
LLC. All Rights Reserved.
2.0L
Diesel (LUZ)
—
to
—
Page 2
October, 2020
Bulletin No.: 18-NA-361
5168457
Some technicians may find metal particles in the fuel system during diagnostics.
Important: If the fuel/water filter has been removed for inspection, Do Not install the
filter back into the housing until the fuel/water separator reservoir has been cleaned.
Refer to the Information on Fuel/Water Filter Removal section below.
Some technicians may also find one or more of the following DTCs set in the Engine
Control Module (ECM):
• P0171: Fuel System Lean
• P0172: Fuel System Rich
• P026D: Injection Quantity Too High
• P0300: Engine Misfire Detected
• P2A00: HO2S Performance Sensor 1
Correction
If you encounter such a situation, DO NOT replace the fuel system as described in
Service Bulletin #16-NA-102.
Please perform the following fuel system flushing procedure prior to performing further
diagnostics.
Once the fuel system has been flushed, continue with diagnostics as described in SI.
Bulletin No.: 18-NA-361
October, 2020
Page 3
Information on Fuel/Water Filter
Removal
5417281
5417311
Water or other like contaminates in the fuel will create
driveability concerns and loss of engine power. If water
and/or debris is present in the fuel system, the fuel
cannot cool and lubricate the components properly,
causing overheating, rust and corrosion. This can result
in component failure. Water and debris can enter the
fuel system in several ways, either through a
contaminated refueling source, plugged venting or
through long term condensation in the vehicle fuel
tanks.
1. Remove the fuel/water filter from the housing using
care not to separate the filter from the fuel/water
separator reservoir.
Page 4
October, 2020
5417298
2. Using care, separate the filter from the fuel/water
separator reservoir by placing the filter downwards
in a clean/dry drain pan.
Bulletin No.: 18-NA-361
5417283
– If the filter is facing upwards, debris left on the
sides of the filter may escape past the O-ring
seal during removal and settle in the fuel/water
separator reservoir.
– Water and/or debris left in the fuel/water
separator reservoir will flow past the filter, directly
into the fuel system when re-started.
– Debris that is allowed past the filter and into the
fuel system can cause fuel injection issues that
may set DTCs P2A00, P026D, P0300, P0172.
Replacement of fuel injectors without a complete
cleaning of the fuel system will only be a
temporary fix until the debris gets into the new
injectors.
3. Inspect the fuel/water separator reservoir and filter
for heavy debris.
• If heavy debris is found in the filter, clean the
fuel/water separator reservoir and continue to
the Fuel System Flushing Procedure below.
• If no signs of debris are found, clean the fuel/
water separator reservoir, install a new filter and
refer to SI for further diagnostics.
Bulletin No.: 18-NA-361
October, 2020
Fuel System Flushing Procedure
Note: Performing the test may aid in determining the
source and section of the fuel system causing the
contamination.
Page 5
7. Install a clear line between the fuel supply hose
and the fuel return hose.
8. Run the fuel pump until the fuel runs clear in
the line.
1. If removed, re-install the fuel filter.
5168447
5167517
2. Disconnect the chassis side fuel feed hose (3) from
the engine side fuel feed pipe (4).
3. Place the end of the chassis side fuel feed hose
into a clean container and run the fuel pump to
clean any debris left in the fuel lines, approximately
2-3 gallons (7.6-11.4L).
4. Clean the fuel/water separator reservoir.
5. Install a new fuel filter.
6. Disconnect the chassis side fuel return hose (2)
from the engine side return pipe (1).
Note: The white “Tubing” shown in the graphics below
depict the route of the clear line, not the length.
5168476
9. Connect the fuel supply hose to the engine
supply pipe.
10. Install a clear line in series at the fuel return hose
to the engine return pipe.
11. Run the fuel pump until the fuel runs clear in
the line.
Reconnect all fuel lines and retest for any codes or
symptoms in the vehicle.
Parts Information
No parts are required for this repair.
Page 6
October, 2020
Bulletin No.: 18-NA-361
Version
7
Modified
Released December 10, 2018
June 24, 2019 – Added 2020 to Model Year.
August 14, 2019 – Added 2019 and 2020 Silverado HD Models.
October 03, 2019 – Added Information on Fuel/Water Filter Removal section.
October 14, 2019 – Removed LCF and added 2020 Silverado/Sierra 1500 with LM2.
September 09, 2020 – Added DTCs to the Subject, Condition and Information on Fuel/
Water Filter Removal sections.
October 20, 2020 – Added the 2021 Model Year to Silverado and Sierra Models and
additional engine descriptions.
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
- Restores fuel economy
- Stabilizes ethanol
- Maximizes horsepower
- Improves responsiveness
- For use in both gasoline and diesel engines
Last update on 2026-06-23 / 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: 18NA361
Replacement Service Bulletin Number:
MFR Communication Date: 2020-10-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL SYSTEM, DIESEL
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford, for Lincoln, and for Mazda ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.