NHTSA ID Number: 10180293
Manufacturer Communication Number: 16NA361
TSB/Document Date: 2020-09-28
Summary
This informational bulletin explains possible normal condition of a flare from 1st to 2nd, even if the trans had been repaired for the flare and its still noticed.
Bulletin No.:
Service Bulletin
Date:
16-NA-361
August, 2020
INFORMATION
Subject:
Brand:
Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under
Light Throttle
Model:
to
2016
2019
CT6
2016
2020
CT4
2020
2021
Escalade Models
2015
2017
ATS
CTS Models
Cadillac
Camaro
2016
2021
Colorado (VIN S, T)
2017
2021
Corvette
2015
2019
Express
2017
2021
Silverado
2015
2018
Silverado LD
2019
2019
Silverado 1500 (New
Model)
2019
2021
Canyon
Savana
Model Year:
from
2017
VIN:
from
Engine:
to
Automatic 8L45
(M5N) 8L90
(M5X, MQE)
Automatic 8L90
(M5U, MQE)
-
-
-
Automatic 8L45
(M5T) 8L90 (M5U,
M5X, MQE)
2021
2021
Sierra
2015
2018
Sierra Limited
2019
2019
Sierra 1500 (New
Model)
2019
2021
Yukon
2015
2017
Automatic 8L45
(M5T) 8L90 (M5U,
M5X, MQE)
Automatic 8L90
(M5U, MQE)
Involved Region or Country
North America and N.A. Export Regions
Condition
Some customers may comment that the transmission exhibits a harsh 1-2 shift on the first
shift of the day, typically under light throttle.
Cause
This condition is due to the initial clutch fill time of the 2-3-4-6-8 (C4) clutch.
Information
Some customers may experience a flare condition on the first 1-2 shift of the day or after
the vehicle has been parked for several hours. The condition may have developed after
the replacement of a complete transmission assembly or the replacement of the stator
support to correct a delayed engagement condition. This is most likely to occur under
light throttle conditions. Subsequent 1-2 shifts have acceptable shift feel. Replacing
transmission components will not correct the condition.
Correction
Important: Replacing transmission components or complete assemblies will not improve
the condition.
The first 1-2 shift of the day may be harsh. The customers’ vehicle should be compared to
a like vehicle under the same driving conditions. Do Not replace any parts for this
condition.
Note: This condition will not impact the designed performance or reliability of the vehicle.
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
August, 2020
Bulletin No.: 16-NA-361
Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation
Description
Labor Time
8481038*
Confirmation Verification of First 1-2 Shift of the Day
0.3 hr
*This is a unique Labor Operation for Bulletin use only.
Version
7
Modified
Revised Nov. 18, 2016 - Revised the Cause section.
Revised April 6, 2017 - Added models and Revised the Condition, Cause and Correction
sections.
Revised July 20, 2017 - Updated Model section.
Revised May 21, 2018 - Updated Model section.
Revised October 08, 2019 - Added 2020 CT4 and updated models to 2020.
Revised August 10, 2020 - Added 2021 to Model Years and add Labor Operation 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
- 💯【Conta.ct us for Support Directly】If you met any...
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW...
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS...
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full...
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE...
- 【TURN OFF CEL】 This AL319 car scanner diagnostic tool...
- 【EXTENSIVE APPLICATION】 Autel AL319 Compatible with...
- 【FOR END USER & DIYERS】 This error code reader AL319 is...
- 【USER-FRIENDLY DESIGN】 This OBD2 scanner and check...
- 【HIGH-QUALITY SERVICES】 12 months war.ranty from the...
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: 16NA361
Replacement Service Bulletin Number:
MFR Communication Date: 2020-08-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN:AUTOMATIC TRANSMISSION
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- 【OE-Level Full System Diagnostics-Lifetime F*REE Software Updates】The VDIAGTOOL D200 OBD2 Scanner for cars is a all system bidirectional scan tool that enjoy lifetime f*ree software updates, delivers complete system coverage. reading/clearing codes across engine, transmission, ABS, SAS, EPB, TPMS plus full access to body, chassis, powertrain and all control modules. This D200 Bidirectional car scanner works with most 1996+ OBD2 gasoline and hybrid
cars and light trucks. It does NOT support pure electric and heavy-duty trucks. PLEASE CHECK COMPATIBILITY BEFORE ORDERING or Contact us with VIN to confirm compatibility. - 【Supports OBD2 Full Functions-ZERO Subscription Fees】D200 Bidirectional OBD2 Scanner is a upgarde of universal car code reader. It supports OBD2 full functions to help you turn off the annoying instrument fault indicator, such as read/clear codes, O2 sensor test, I/M readiness, on-board monitor test, datastream, freeze frame, E-VAP system test, and retrieve vehicle information. This professional obd2 scanner diagnostic tool can full access to diagnostics, reset tools and maintenance features with a single payment. NOTE: The fault code can only be cleared after the vehicle's malfunction has been repaired; please ensure the vehicle issue is fixed before clearing the code.
- 【D200 Hidden 2 Advantages: 1. $169 Expandable 49+ Advanced Resets. 2. $199 Get J2534 P*a*s*s-Thru Programming】Your core car diagnostics and 26 reset remain lifetime f*ree for everyday maintenance. When you need deeper repair capability, upgrade with 3-year access for $169 in Store on VDIAGTOOL App, gaining 49+ advanced resets. D200 configured with J2534 hardware, upgrade only when you need without replacing the entire device. You also can Lifetime Unlock for $199 in Store one-time, perform module programming, software re~flashing and ECU data updates directly. Supports 17+ major brands, including for BMW, for Audi, for GM, for Ford and more. Note:D200 does‘t provide any OE software.
- 【Full Bidirectional Control / Active Tests】The D200 car scanner diagnostic tool is a true bidirectional scan tool that lets you send commands directly to the vehicle’s ECU for active tests. Quickly test fuel pumps, relays, solenoids, injectors, cooling fans, windows, sunroofs and more to verify operation instantly. Get dealership-level diagnostic control at a fraction of the cost (ofter $100-200$ per diagnostic visit), reduce guessworkand confirm repairs faster, avoid unnecessary parts replacement, towing fees and wait times.
- 【26 F*ree Essential Reset & Relearn Functions – Everyday Maintenance Made Easy】Handle common maintenance and repair jobs without visiting the shop. The D200 code readers & scan tools includes 26 f*ree high-demand reset functions, including Oil Reset, EPB Service, SAS Calibration, ABS Brake Bleeding, Throttle Relearn, Injector Coding, Headlight Adjustment, Tire Size Reset and more. Perfect for home car owners, mechanics and DIYers – just plug and diagnose anytime, anywhere! Note: Service functions vary by vehicle model—please confirm compatibility.
- 【A MUST-HAVE TOOL FOR DIYERS】 - VDIAGTOOL VD10 car code reader is an incredibly useful obd scanner for each car owner or hobbyist, even for those with little to no experience when it comes to vehicle mechanics! Similar to a fixd car diagnostic tool, using this car diagnostic scanner is extremely easy. All you have to do is attach it to your car OBDII port and you can diagnose car problems in seconds! Read Codes (DTCs); Clear Codes; Live Data; View Freeze Frame; I/M Readiness; Vehicle Information.
- 【KEEP ENGINE IN GOOD STATUS】 - VDIAGTOOL check engine code reader brings a fast access to scan, read the car fault code, show its definition on the screen instantly, troubleshooting to find the root causes of problems, erase the engine fault code and turn off the MIL (Malfunction Indicator Light). Similar to a fixd car diagnostic tool, this car code reader helps ensure your engine stays in top condition.
- 【READ/CLEAR CODES & DTC LOOKUP】- No search online & saving your time, this vehicle car code reader retrieves generic (P0, P2, P3, and U0), manufacturer specific (P1, P3, and U1) codes, pending codes and displays DTC definitions based on the built-in database(more than 3000 codes) on the TFT screen, find out the root causes and clear the codes after fixed.
- 【LIVE DATA & RETRIEVE FREEZE FRAME】 - This diagnostic scan tool for accurate diagnosis enables you to retrieve data from vehicle sensors, such as Engine RPM, Intake air temperature, Short/Long term fuel, Misfire data and etc. The freeze frame is stored in the PCM together with the diagnostic trouble code (DTC) related to the fault. Comparable to a fixd car diagnostic tool, the VD10 car code reader car scanner can be a valuable & practical diagnostic aid and also greatly help when diagnosing intermittent problems.
- 【I/M READINESS for THE S-nn-0-g CHECK】- OBDII vehicle may not pass the annual inspection unless the required monitors since reset are complete. So you should at least read the readiness monitors and make sure they are ready. This car obd2 scanner diagnostic tool is equipped with I/M readiness function to check the operations of the e-m-issi0n system on OBD2 compliant vehicles, run I/M monitor readiness test, checking if the pass vehicle s-m-0-g inspection.
- 【Professional Diagnostics】 The VD80 BT Lite bidirectional obd2 scanner is a professional OBD2 scanner diagnostic tool, delivering vehicle diagnostics right in your own garage. It supports 4,000+ active diagnostic tests, 28+ maintenance service functions, ECU coding, PMI calibration, brake service reset, and OEM-grade full-system vehicle scanning—perfect for DIYers and pros looking for powerful automotive tools. The available function tests vary by model—please to confirm compatibility.
- 【ADVANCED ECU CODE, CUSTOMIZE OE-SETTINGS】As a complete car code reader and reset tool, the VD80 BT Lite bidirectional obd2 scanner supports ECU coding for VW, for Audi, for BMW, for Benz, for Mitsubishi and more. PMI function for Ford/for Lincoln/for Mazda, supports copy data into new module. Step-by-step Guided Diagnostics makes complex jobs easier—making this one of the most reliable code readers & scan tools on the market.
- 【100000+ Vehicles Compatibility – CAN FD/DOIP】 VD80 BT Lite Auto Scanner Compatible with 100,000+ vehicles worldwide, this bidirectiona car scanner works with all OBD2-compliant vehicles manufactured after 1996, covering more than 100 brands worldwide. It also supports CAN FD, DOIP and FCA Secure Gateway protocols, boost 2X faster data transfer, covers 99% of U.S., EU and Asian cars. With 22 languages and 2 years of f*ree updates—future-proofing your car reader diagnostic for all cars.
- 【28+ Maintenance Services & Calibration Functions】VD80 BT Lite scanner for car Supports 28 maintenance services, including resetting oil and service lights after routine maintenance, registering new batteries for proper system operation, and clear clogged filters and restore performance. Additionally, it calibrates TPMS sensors after tire rotations, resets brake systems after pad replacements, relearns steering angle sensors after alignments, and more. These functions help your vehicle quickly and accurately return to peak performance—without the costly dealer visits.
- 【True Bidirectional Control – Diagnose with Confidence】Standing out with full-system coverage and extensive active test capabilities, the VD80 BT Lite bidirectional scan tool retrieves data from electronic control units and performs a wide range of active tests. You can real-time control over modules like fuel pumps, windows, A/C clutches, and relays. Perform 100+ advanced functions including throttle adaptation, injector coding, VIN write, idle relearn, and ABS bleed—helping you fix it right the first time with this all-in-one car diagnostic scanner.
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.