NHTSA ID Number: 10222659
Manufacturer Communication Number: 19-NA-187
This bulletin provides additional information on how to graph a cylinder misfire and a possible diagnostic cause.
Some customers may comment on one or more of the following conditions:
- MIL illuminated
- Engine misfire
Some technicians may find DTC P0300 set in the Engine Control Module (ECM).
This condition may be caused by a weak cylinder.
Refer to the Service Procedure below to help identify which cylinder is misfiring.
39 Affected Products
1 Associated Document
Bulletin No.: 19-NA-187
Date: September, 2022
- CEL Doctor: The ANCEL AD310 is one of the best-selling OBD II scanners on the market and is recommended by Scotty Kilmer, a YouTuber and auto mechanic. It can easily determine the cause of the check engine light coming on, quickly read and clear diagnostic trouble codes, read live data & hard memory data, view freeze frame, I/M monitor readiness and collect vehicle information. Instead of taking car to mechanic shop, you can use it to check the trouble code and show code definition by yourself.
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- Multi-Functions - Practical Multi-Functions OBD2 code reader features built-in OBD2 DTC lookup library, which help you to determine the cause of the engine light, read code, erase code, view freeze frame, I/M ready, vehicle information, data flow, real-time curve, get vehicle speed information, calculate load value, engine coolant temperature, get engine speed.
- Wide Capability - Supports 9 protocols compatible with most 1996 US-Based, 2000 EU-Based and Asian cars, and newer OBD II & CAN domestic or import vehicles. Supports 6 languages - English,German, Dutch, Spanish, French, Italian.
- LCD Display - Designed with a clear display LCD screen (128 x 64 pixels) - white backlight and contrast adjustment. No need any battery or charger, OBD reader gets the power directly from your vehicle through the OBDII Data Link Connector.
- Compact Design - Car diagnostic scanner is equipped with a 2.5 feet long cable and made of a very thick flexible insulator.There are 6 buttons on OBD2 Scanner:scroll up/down,enter/exit and buttons that quick query VIN vehicle number& the DTC fault code.
- ABS / Airbag codes NOT Supported - It is able to read and clear check engine information which is part of OBDII system, but it cannot work with non-OBDII systems, including ABS / Airbag / Oil Service Light, etc.
- 🆚LAUNCH X431 PRO5 scan tool Upgrade all functions of X431 PRO3/X-431 Throttle III/X431-TorqueIII/X431 V+, PROS V+, PAD3. ⓵ J2534 ECU Programming &Online functions directly connect to OEM server, 50+ reset same as X-431 Throttle;⓶Bi-directional control and All system diagnostics as Snap-on scanner; ⓷ Support 150+ brands Vehicles (include CAN/CAFD/DoIP/HD protocols and AutoAuth for FCA SGW) ⓸Powered by 8-core processor(1.8GHz), Android9.0 OS, 2.4 & 5GHz WiFi connection.
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- 👍【2023 New OE Level Online Functions 】Bidirectional Scan Tool offers you various high-end online functions, which enable you to access the online data to do fast & complicated vehicle repairs, e.g. 1) ECU Coding for replacing, match, relearn, recode new ECU modules; 2) Online Coding for BMW, Audi, VW, Porsche, Benz to surf OEM data; 3) VAG Guided functions ease complex issues; 4) Personalization & ADAS improving car performance and driving safety.
- 【Vehicle CEL Doctor】The NT301 obd2 scanner enables you to read DTCs, access to emissions readiness status, turn off CEL(check engine light) or MIL, reset monitor, read live data and retrieve VIN of your vehicle.
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- 【Worthy to Own】Recommended by Mechanic Scotty Kilmer on Youtube. Codes analysis and Printer compatible. Unique PATENTED design, 2.8" color screen, Free Lifetime Update and 1-year seller assurance with EXCLUSIVE tech and service team.
- 【Smog Check Helper】Read/Erase and I/M readiness hotkeys make it easy to use the car computer reader right out of the package. Red-Yellow-Green Leds and build-in speaker indicate the readiness status for confident e-missions test.
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- 👍【A-ctive Test + Local-smith Level ECU Coding】Come with appealing bi-directional control to troubleshoot all possible problems for full systems within 5 minutes. This LAUNCH X431 PRO scanner even develops all practical functions needed by all technicians: 1) ECU Coding for replacing, match, relearn, recode new ECU modules; 2) Online Coding for B-MW, VW, Porsche, Ben-z to surf OEM data; 3) VAG Guided functions ease complex issues; 4) Personalization & ADAS improving car performance and driving safety.
- 👍【All System Diagnostics for 99% Vehicle Coverage] Serve for 150+ American, Asian, European brands, and cover 99% of vehicle models worldwide. This LAUNCH diagnostic scan tool can operate complete full-function diagnostics to all on-board systems to troubleshoot and repair all vehicle problems, including Engine, Transmission, Airbag, ABS, ESP, TPMS, Immobilizer, Gateway, Steering, Radio, Air Conditioning, etc.
- Please contact us (7/24 service) before purchasing to confirm that Thinkdiag2 can perform this function on your vehicle. This OBD2 scanner the only diagnostic scanner in this price range that supports the CAN-FD protocol that is compatible with the latest GM vehicles manufactured after 2020, which can run faster than other products to greatly enhance the user experience. Unlock the protected FCA vehicle SGW module on Chrysler, Dodge, Jeep, Alfa Romeo, and Fiat vehicles manufactured after 2019.
- ThinkDiag2 is an OE-Level Bluetooth diagnostic tool that supports full system diagnosis. It supports read/clear codes, datastream, actuation tests, special functions, coding, adaptation, and read control module information for all systems, such as ECM, ABS, SRS, TCM, EPB, TPMS, SAS, A/C, BMS, etc. The specific functions that can be performed may vary by car model. Free software updates and usage are available for 1 year, paid subscription is required to use the model software after expiration.
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- Thinkdiag2 OBDII code scanner is designed for individual car owners, DIYers, and small repair shops, which has a separate menu of 15 common special functions, such as Oil reset, EPB reset, SAS calibration, ABS bleeding, injector code, IMMO matching, TPMS reset, etc. Enter from the all-system diagnostic menu to unlock more system special functions, and effectively handle the reset and relearn of most cars. Note: The Maintenance functions that each car can do may be different.
- The 2022 newest diagnostic scanner has an Auto-VIN function, it can help car owner/repair stores automatically and quickly identify the year of manufacture, model, and VIN of most models, then enter the vehicle diagnostic menu. Then you can click 'Health Report' for a complete vehicle system scan, which will automatically generate a detailed vehicle health report after diagnosis. Reports and diagnostic records can be viewed in the REPORT and HISTORY menu, and reports can be shared and printed.
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Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 19-NA-187 Date: September, 2022 INFORMATION Subject: Diagnostic Tip to Identify Engine Misfiring and/or Malfunction Indicator Lamp (MIL) Illuminated – DTC P0300 Setting Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Silverado 2017 2018 Silverado L5P 2500/3500 2019 2023 Silverado 4500/5500/6500 2019 2023 L5D GMC Sierra 2017 2018 Sierra L5P 2500/3500 2019 2023 Involved Region or Country North America and Israel Condition Some customers may comment on one or more of the following conditions: • MIL illuminated • Engine misfire Some technicians may find DTC P0300 set in the Engine Control Module (ECM). Cause This condition may be caused by a weak cylinder. Correction Refer to the Service Procedure below to help identify which cylinder is misfiring. Service Procedure 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. If there is any difficulty identifying a misfiring cylinder, it may be useful to graph the Cylinder Balance Test in GDS2. Do Not rely on this test as the ONLY means of identifying a weak cylinder. The balance test should only run when the misfire is present in the engine. Graph the engine RPM as well as each injector command. It is recommended to perform the test a minimum of three times with three different balance tests while looking for the consistency. The example below is from an engine that has a misfire on cylinder #1. It is recommend when setting up the graph, use the following settings: Page 2 September, 2022 Bulletin No.: 19-NA-187 5394634 The most important thing is that the RPM line is visible and not covered by the injector command lines. All three graphs below, each injector was cancelled in order, 1 – 8. 5394706 Note that cylinder #1 does not drop the RPM when canceled, when compared to the other cylinders. ⇒ RPM recovery is limited after the cancellation has ended. ⇒ Other cylinders do not have as much of a RPM drop when they are canceled, however the RPM does jump after the cancellation has ended. Bulletin No.: 19-NA-187 September, 2022 Page 3 5394746 During this second balance test, it appears like cylinder #1 is contributing, however it is less than any of the other cylinders. 5394869 During this final test, it appears that cylinder #5 is not contributing as well as #1. This is one of the main reasons that we must repeat the test to find consistency. ⇒ This vehicle was repaired by replacing #1 fuel injector. Note: This is not the only tool that should be used to identify a misfiring cylinder, but it can help aid in diagnosing this concern. Parts Information No parts are required for this repair. Page 4 September, 2022 Bulletin No.: 19-NA-187 Version 4 Modified Released August 23, 2019 Revised October 28, 2020 – Added 2021 Model Year. Revised January 12, 2022 – Added 2022 Model Year. Revised September 09, 2022 — Added the 2023 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION