NHTSA ID Number: 10161881
Manufacturer Communication Number: 18NA355
TSB/Document Date: 2019-07-01
Summary
This technical bulletin provides information for new transmission oil to use and a procedure for exchanging the old fluid and adding the new fluid to correct a shake/shudder during light throttle acceleration condition.
Service Bulletin
Bulletin No.:
18-NA-355
Date:
May, 2019
TECHNICAL
Subject:
Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH
(40 and 128 KM/H) at Steady Speed
Attention: This Bulletin only applies to vehicles sold in the U.S., Canada and Middle East
Operations (MEO). Mexico and Export Regions should follow Bulletin 19-NA-018.
Model Year:
Brand:
Model:
ATS
CTS
CT6
from
to
2016
2019
2016
2018
from
to
Engine:
(2.0L, 2.5L, 3.0L,
3.6L, 5.3L, 6.2L)
Transmission:
(8L45, 8L90
Automatic)
Feb.
1, 2019
LCV, LGX, LTG,
LT4, LF4
M5N, M5T, M5U
LGX, LGW, LTG
M5N, M5X
L86
M5U
EOP
Escalade
Models
2015
2017
Camaro
2016
2019
Feb.
1, 2019
LGX, LTG, LT1
M5T, M5U
Colorado
2017
2019
March
1, 2019
LGZ
M5T
Corvette
2015
2019
Feb.
1, 2019
LT1, LT4
M5U
Silverado
Models
2015
2018
EOP
L83, L86, L8B
M5U, M5X
Canyon
2017
2019
March
1, 2019
LGZ
M5T
Sierra
Models
2015
2018
L83, L86, L8B
M5U, M5X
Yukon
Models
2015
L86
M5U
Date Breakpoint:
SOP
EOP
2017
Involved Region or Country
United States, Canada, Middle East Operations (MEO)
Condition
Some customers may comment on any of the following conditions:
• A shake and/or shudder during light throttle acceleration between 25 and 80 mph
(40 and 128 km/h) steady state driving when transmission is not actively shifting
gears.
• A shudder feeling that may be described as driving over rumble strips or rough
pavement.
Shudder feeling is evident in both Drive and M7 (MY15-16) and L7 (MY17/MY18) mode.
Copyright 2019 General Motors
LLC. All Rights Reserved.
Page 2
May, 2019
Diagnosis Instructions
Bulletin No.: 18-NA-355
Run the following tests for 3 operational modes:
A. Normal Operation (GDS2 for viewing only)
B. GDS2 Commanding TCC in Disabled Operation
(TCC Open)
C. GDS2 Commanding TCC in Enabled Operation
(TCC Locked)
To ensure torque converter clutch (TCC) shudder is
diagnosed correctly, please drive the following
schedule on a smooth road with transmission sump
temperature between 50°C (122°F) - 70°C (158°F).
Important: For some road conditions, it may be
required to apply the brake pedal and throttle
simultaneously to stay within desired gear, engine firing
mode, engine torque range, and engine/vehicle speed
ranges.
For Full Size Trucks/SUVs - Press and hold the
tow-haul mode button for 5 seconds to disable grade
braking to prevent downshifts during test.
Shudder Test
Refer to the table below for conditions pertaining to
specific applications. In each vehicle, constant throttle
input on a smooth grade is desirable. PicoScope
Measured Frequency is the approximate vibration
frequency where TCC shudder can be found,
discussed in detail below.
Vehicle Information
Shudder Test Conditions
PicoScope
Engine
Torque
(Nm)
Measured
Frequency
(+/- 2 Hz)
42-55
(67-88)
100-250
23
1100-1500
42-55
(67-88)
100-250
23
V8
1000-1500
42-62
(67-99)
200-375
28
8
4
1100-1500
42-55
(67-88)
100-250
23
M5N
8
V6
1100-1500
42-55
(67-88)
100-250
23
LTG
M5N
8
4
1100-1500
42-55
(67-88)
100-250
23
6 CYL.
Twin
Turbo
LF4
M5U
8
V6
1100-1500
42-55
(67-88)
150-300
26
CT6
6 CYL.
Twin
Turbo
LGW
M5X
8
V6
1100-1500
42-55
(67-88)
150-300
26
CT6
6
CYL. NA
LGX
M5N
8
V6
1100-1500
42-55
(67-88)
100-250
23
CT6
4 CYL.
Turbo
LTG
M5N
8
4
1100-1500
42-55
(67-88)
100-250
23
Camaro
6
CYL. NA
LGX
M5T
8
V6
1100-1500
42-55
(67-88)
100-250
23
Camaro
4 CYL.
Turbo
LTG
M5T
8
4
1100-1500
42-55
(67-88)
100-250
23
Camaro
SS
8
CYL. NA
LT1
M5U
8
4/V8
10001,500
40-55
(64-88)
(V4) 100200 /(V8)
175-375
28
Corvette
8
CYL. NA
LT1
M5U
8
4 (Eco
Driving
Mode)
1000-1800
40-80
(64-128)
125-250
28
Corvette
Z06
8 CYL.
Supercharged
LT4
M5U
8
4 (Eco
Driving
Mode)
1000-1800
40-80
(64-128)
125-250
28
Silverado/
Sierra
8
CYL. NA
L83
M5U
8
V8
1050-1500
45-55
(72-88)
200-375
26
Make
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TSB/Document ID: 18NA355
Replacement Service Bulletin Number:
MFR Communication Date: 2019-05-21
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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