NHTSA ID Number: 10163890
Manufacturer Communication Number: 18NA355
TSB/Document Date: 2019-08-19
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.
Bulletin No.:
Service Bulletin
Date:
18-NA-355
August, 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 that their vehicle is experiencing 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.
⇒ The condition may be described as if they are driving over rumble strips or a
concrete road surface with rough expansion joints.
Cause
This condition may be due to Torque Converter Clutch (TCC) Shudder.
Correction
Vehicles that are presented with TCC shudder should have the appropriate fluid
exchange procedure completed. Diagnosis beyond the customer compliant is not
required if vehicle was built prior to production dates indicated above.
For vehicles built after the production dates listed above.
⇒ If a customer presents a vehicle with a similar complaint, follow normal SI
diagnostics. These vehicles are already equipped with the latest HP fluid.
Copyright 2019 General Motors
LLC. All Rights Reserved.
Page 2
August, 2019
Special Tools
DT-52263 Transmission Fluid Exchange Kit:
• DT-52263-1 Block Assembly (includes fluid drain
hose, spring clamp)
• DT-52263-2 Cooler Line Plug (qty 3) (use with rear
differential cooler and Camaro V8 non rear
differential cooler)
• DT-52263-3 ½” Cooler Line Flush Adapter for
2019 Silverado and Sierra
• DT-52263-4 3/8” Hose Adapter (6” long with 2
hose clamps)
• DT-52263-5 Radiator Cooler Drain Adapter
3763203
•
DT-51190 Transmission Oil Fill Adapter
GE-47716-2 Graduated Bucket
1215917
DT-45096 TransFlow Cooler Flush Machine
4733125
DT-45096-31 TransFlow Adapter (one of two pieces
from DT-45096-30)
5181938
•
Bulletin No.: 18-NA-355
Bulletin No.: 18-NA-355
August, 2019
Service Procedure
Page 3
1. Fill the DT-45096 with 20 quarts of HP fluid.
2. Raise the vehicle on a hoist.
Initial TransFlow Flush Machine Setup
Important: The prepping procedure only needs to be
completed if the DT-45096 supply reservoir has
DEXRON VI fluid in it and has not been converted to
use the new blue label Mobil 1 Synthetic LV ATF HP
fluid.
Note: The prepping procedure only needs to be
completed if HP fluid is not in the supply reservoir.
1. Connect the TransFlow adapter DT-45096-31 to
the supply line of the DT-45096 TransFlow
machine.
5182541
3. Install the DT-45096-31 TransFlow adapter (1) to
the DT-51190 fluid fill adapter (2).
5180884
2. Switch the DT-45096 TransFlow to Idle.
3. Connect power leads to the vehicle 12-volt DC
supply.
4. Turn the TransFlow main switch ON.
5. Connect air supply to the DT-45096.
6. Place the TransFlow supply hose with adapter
DT-45096-31 into a waste reservoir using care not
to spill the expelled fluid.
7. Switch the DT-45096 TransFlow to Flow and allow
all the fluid in the supply reservoir to be removed
and placed in the waste reservoir.
8. Switch the control switch back to idle.
Fluid Exchange Procedure - Colorado, Canyon,
Silverado, Sierra, Yukon Denali and Escalade
Models with an Accessible Transmission Oil
Cooler Line Block Assembly
Important: This procedure must be followed as
published. The exchange process is required to obtain
proper level of new blue label Mobil 1 Synthetic LV ATF
HP fluid. Intermixing of other types of transmission fluid
or aftermarket additive packages will result in a low
concentration level of new fluid and will not provide
satisfactory results.
5180563
4. Remove the transmission oil cooler pipe assembly
from the transmission.
5. Install the DT-52263-1 Adapter Block Assembly
(1), reusing the seal from the transmission oil
cooler pipe assembly.
6. Tighten the bolt (2) to 22 Y (16 lb ft).
7. Place the hose (3) in the GE-47716-2 Graduated
Measuring Bucket, utilizing a Spring Clamp to
retain the hose.
Page 4
August, 2019
Bulletin No.: 18-NA-355
13. Shut the engine off immediately.
14. Connect the DT-45096 to the vehicle battery
12 volts and connect shop air to the air connection.
3723844
8. Remove the level set plug (1) from the
transmission.
Important: DO NOT over tighten the DT-51190 as it
can be damaged by excessive torque. DO NOT exceed
9 Y (80 lb in).
9. Install the DT-51190/DT-45096-31 assembly and
hand tighten as shown in the graphic above.
5181027
15. Switch the DT-45096 TransFlow to Flow and add
4 quarts of HP to the transmission.
5181020
3723839
10. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter (2).
11. Lower the vehicle.
Caution: DO NOT REMOVE MORE THAN 3 QUARTS
OF FLUID AS IT COULD CAUSE FLUID PUMP
CAVITATION AND POSSIBLY DAMAGE THE
TRANSMISSION.
12. Utilizing the graduated bucket, start the engine and
run 30- 45 seconds until 3 quarts of fluid is
expelled.
16. Switch the DT-45096 TransFlow to Idle (Reducing
fluid level in the TransFlow from 20–16).
17. Switch the TransFlow DT-45096 to Flow and start
the engine:
17.1. Add a maximum of 4 quarts of HP Fluid to
the transmission, turn the TransFlow switch
to idle once 4 quarts have been added, while
allowing 4 additional quarts of oil to fill the
DT-graduated bucket (Reducing fluid level in
the TransFlow from 16 – 12).
Bulletin No.: 18-NA-355
August, 2019
Note: DO NOT add additional transmission fluid until
the 4 quarts of oil have been removed from the
transmission (Reducing fluid level in the TransFlow
from 12–8).
Page 5
24. If equipped, remove the Thermal By-Pass Block
from the cooler pipes on the Escalade, Silverado,
Sierra and Yukon Models.
17.2. Repeat step 17.1.
17.3. Add a maximum of 5 quarts of HP fluid to the
transmission while allowing 5 additional
quarts of oil to fill the DT-graduated bucket
(Reducing fluid level in the TransFlow from
8 – 3).
1762577
25. Install DT-45096-31 adapters (1) to the
transmission oil cooler lines.
26. Connect the DT-45096 TransFlow to the
DT-45096-31 adapters.
5181401
18.
19.
20.
21.
22.
17.4. Shut the engine off once 16 quarts of fluid
have been collected.
17.5. Properly dispose of the expelled
transmission fluid.
Raise the vehicle.
Disconnect the DT-45096 TransFlow feed (supply)
line from DT-45096-31 TransFlow adapter.
Using care, remove DT-45096-31/DT-51190 as an
assembly.
Remove the DT-51190 fluid fill adapter from
DT-45096-31 hose.
Install the level set plug.
Tighten
Tighten the plug to 9 Y (80 lb in).
23. Remove DT-52263-1 Adapter Block Assembly
from the transmission.
5210461
27. Switch the DT-45096 TransFlow to Flush.
28. Flush the vehicle cooler and lines using 2 quarts of
HP fluid.
⇒ Flush 1 quart of fluid through the lines, then
switch the hose connections and flush 1 quart
of fluid in the opposite direction.
29. Remove the DT-51190/DT-45096-31 assembly.
30. If equipped, install the Thermal By-Pass Block from
the cooler pipes on the Escalade, Silverado, Sierra
and Yukon Models.
Page 6
August, 2019
31. Install the transmission oil cooler pipe using a new
cooler block seal.
32. Partially lower the vehicle.
33. Start the engine.
34. Using care, shift the transmission through all
forward ranges and Reverse.
35. Shift the transmission into Park.
36. Perform the Transmission Fluid Level and
Condition Check outlined below in this procedure:
36.1. Get the transmission fluid temperature to the
proper temperature.
36.2. Install the level set plug.
Tighten
Tighten the plug to 9 Y (80 lb in).
The TCC shudder condition should be directional
improved immediately after the fluid exchange
procedure. It may take up to 320 km (200 mi) for the
TCC shudder condition to be eliminated. It is not a
requirement for the dealer to drive the vehicle 320 km
(200 mi). The customer should be advised that the full
effect will take up to 320 km (200 mi) and a minimum of
two cold to operating temperature drive cycles.
Fluid Exchange Procedure - Camaro (Except
Camaro V8-See Procedure below for Camaro
V8), CTS and ATS Not Equipped with a Rear
Differential Cooler
Important: This procedure must be followed as
published. The exchange process is required to obtain
proper level of new blue label Mobil 1 Synthetic LV ATF
HP fluid. Intermixing of other types of transmission fluid
or aftermarket additive packages will result in a low
concentration level of new fluid and will not provide
satisfactory results.
1. Fill the DT-45096 with 20 quarts of HP fluid.
Bulletin No.: 18-NA-355
Bulletin No.: 18-NA-355
August, 2019
Page 7
4194576
Note: The MAF sensor must stay connected so that no
DTCs will set.
2. Separate the engine upper air filter box (1) from the
lower air filter housing to gain access to the upper
transmission oil cooler line.
5181322
5181307
Note: Upper air filter box removed for clarity.
- 3X Stronger than the leading full synthetic*
- 10X Better high stress performance**
- 20,000 miles between oil changes***
- Viscosity breakdown as measured in Kurt Orbahn test on 5W...
- As measured in Seq IX test under high load/torque conditions...
- Phosphorus Replacement Technology to help extend the life of...
- Reduces leaks, oil burnoff and power robbing deposits
- 15,000 miles between oil changes*
- Meets or exceeds the following specifications: API SP/SN...
- Or one year, whichever comes first
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TSB/Document ID: 18NA355
Replacement Service Bulletin Number:
MFR Communication Date: 2019-07-29
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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