NHTSA ID Number: 10211684
Manufacturer Communication Number: 16-NA-019
TSB/Document Date: 2022-05-10
Summary
This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
Service Bulletin
Bulletin No.:
16-NA-019
Date:
May, 2022
INFORMATION
Subject:
Information on Transmission Adaptive Functions and Correcting Low Mileage Harsh
Shifts, Slips, or Flares
Model Year:
Brand:
Model:
from
to
VIN:
from
to
Engine:
Transmission:
(8-Speed
Automatic)
ATS
2016
2019
M5N, M5U
CTS
2016
2019
M5N, M5U
CT6
2016
2018
M5N, M5X
CT4
2020
2022
M5N
Escalade
2015
2017
M5U
Camaro
2016
2022
M5T, M5U
Corvette
2015
2019
M5U
Colorado
(VIN S, VIN T)
2017
2022
M5T
Express
2017
2022
M5U, MQD
Silverado
2015
2018
M5U, M5X
Silverado 1500
(New Model)
2019
2019
MQE
MQE
Silverado
2020
2021
Silverado 1500 (LTD, RPO J21,
12th VIN Digit = 4
or less)
2022
2022
Silverado 1500 (RPO J22, 12th
VIN Digit = 5 or
greater)
2022
M5X, MQE
—
2022
—
All
M5X, MQE
Canyon
2017
2022
M5T
Sierra
2015
2018
M5U, M5X
Sierra 1500
(New Model)
2019
2019
MQE
Sierra
2020
2021
MQE
Sierra 1500 (LIMITED RPO
J21, 12th VIN Digit
= 4 or less)
2022
2022
M5X, MQE
Sierra 1500 - (RPO
J22, 12th VIN Digit
= 5 or greater)
2022
2022
M5X, MQE
Savana
2017
2022
M5U, MQD
Yukon
2015
2017
M5U
Copyright 2022 General Motors
LLC. All Rights Reserved.
Page 2
May, 2022
Bulletin No.: 16-NA-019
Involved Region or Country
North America, China, Middle East, Japan, Europe, Korea, Brazil, Thailand, Egypt, Israel,
Guatemala, Peru, Ecuador, Argentina, India, Colombia, Indonesia, Vietnam, Uzbekistan,
South Africa, Venezuela, Philippines, Albania, Kuwait
Condition
Some customers may comment on low mileage vehicles with an automatic transmission
that the shifting may feel too firm (harsh), slips, or flares. Customers should be advised
that the transmission makes use of an adaptive function that will help to refine the shift
feel while driving and improve shift quality.
Note: Low mileage would be considered vehicles that have approximately 8050 km
(5000 mi) or less or on vehicles that have had a valve body, clutch repair or transmission
replacement in the last approximate 8050 km (5000 mi) or less.
Correction
Important: Using Tis2Web, please check the ECM/
TCM Software/Calibrations against what is currently in
the vehicle and if the description of the update is
relevant to the customer concern, please perform the
update prior to proceeding with the learns below. By
completing the software/calibration update, the clutch
adapts will clear and thus a Service Fast Learn (SFL)
followed by Adaptive Learning may be needed to
further learn specific clutches if shift concern exists.
The following should be used to determine what steps
should be followed within this document. The 8-Speed
transmission utilizes a total of 5 clutches to obtain all
the ratios. Utilize the chart within this document to
determine which clutch may require additional adaptive
learning.
• If a valve body replacement, clutch repair/overhaul
or transmission replacement was required, reset
the adapts using Service Fast Learn. Evaluate the
shifts and further learn pressures and volumes if
required using the procedure below.
• If a customer has a specific shift concern, the
Service Fast Learn (SFL) should be skipped.
Complete the Adaptive Learn procedure to further
learn pressures and volumes for the specific shift
concern.
Note: The Adaptive Learn procedure should be used
on vehicles that have approximately 8050 km (5000 mi)
or less or on vehicles that have had a valve body, clutch
repair or transmission replacement in the last
approximate 8050 km (5000 mi) or less. Performing the
Adapt procedure on high mileage vehicles may improve
shift quality for a limited amount of time but the vehicle
will most likely return with the same symptoms.
Transmission Adaptive Functions
The Hydra-Matic® 8-Speed RWD transmission utilizes
a line pressure and volume control system during
upshifts to compensate for new transmission build
variation as well as the normal wear of transmission
components. The variation from new and normal wear
of the apply components within the transmission over
time can cause shift time (the time required to apply a
clutch) to be longer or shorter than desired.
In order to compensate for these changes, the
transmission control module (TCM) adjusts the
pressure commands to the various pressure control
(PC) solenoids to maintain the originally calibrated shift
timing. The automatic adjusting process is referred to
as “adaptive learning” and it is used to ensure
consistent shift feel plus increase transmission
durability.
The TCM monitors the A/T input speed sensor (ISS)
and the A/T output speed sensor (OSS) during
commanded shifts to determine if a shift is occurring
too fast (harsh) or too slow (soft) and adjusts the
corresponding PC solenoid signal to maintain the set
shift feel. The purpose of the adapt function is to
automatically compensate the shift quality for the
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TSB/Document ID: 16-NA-019
Replacement Service Bulletin Number:
MFR Communication Date: 2022-05-06
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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