Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed – 2015-2019 Cadillac Chevrolet GMC

SEOCONTENT-START

Service Bulletin Bulletin No.: 18-NA-355
Date: 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.
Brand: Model:
Model Year: Date Breakpoint: Engine:
(2.0L, 2.5L, 3.0L,
3.6L, 5.3L, 6.2L)
Transmission:
(8L45, 8L90
from to from to Automatic)
Cadillac
ATS
2016 2019
SOP
Feb.
1, 2019
LCV, LGX, LTG,
LT4, LF4 M5N, M5T, M5U
CTS
CT6 2016 2018
EOP
LGX, LGW, LTG M5N, M5X
Escalade
Models 2015 2017 L86 M5U
Chevrolet
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
GMC
Canyon 2017 2019 March
1, 2019 LGZ M5T
Sierra
Models 2015 2018
EOP
L83, L86, L8B M5U, M5X
Yukon
Models 2015 2017 L86 M5U
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.
Page 2 August, 2019 Bulletin No.: 18-NA-355
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
5181938
• 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)
Bulletin No.: 18-NA-355 August, 2019 Page 3
Service Procedure
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.
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.
1. Fill the DT-45096 with 20 quarts of HP fluid.
2. Raise the vehicle on a hoist.
5182541
3. Install the DT-45096-31 TransFlow adapter (1) to
the DT-51190 fluid fill adapter (2).
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 22Y(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
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 NOTexceed
9Y(80 lb in).
9. Install the DT-51190/DT-45096-31 assembly and
hand tighten as shown in the graphic above.
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.
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.
5181027
15. Switch the DT-45096 TransFlow to Flow and add
4 quarts of HP to the transmission.
5181020
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 Page 5
Note: DO NOTadd additional transmission fluid until
the 4 quarts of oil have been removed from the
transmission (Reducing fluid level in the TransFlow
from 12–8).
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).
5181401
17.4. Shut the engine off once 16 quarts of fluid
have been collected.
17.5. Properly dispose of the expelled
transmission fluid.
18. Raise the vehicle.
19. Disconnect the DT-45096 TransFlow feed (supply)
line from DT-45096-31 TransFlow adapter.
20. Using care, remove DT-45096-31/DT-51190 as an
assembly.
21. Remove the DT-51190 fluid fill adapter from
DT-45096-31 hose.
22. Install the level set plug.
Tighten
Tighten the plug to 9Y(80 lb in).
23. Remove DT-52263-1 Adapter Block Assembly
from the transmission.
24. If equipped, remove the Thermal By-Pass Block
from the cooler pipes on the Escalade, Silverado,
Sierra and Yukon Models.
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.
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 Bulletin No.: 18-NA-355
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 9Y(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 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.
5181307
Note: Upper air filter box removed for clarity.
3. Remove the cooler line from the transmission oil
cooler.
5181322
4. Install end of the DT-52263-5 Radiator Cooler
Drain Adapter (1) to the DT-52263-1 Block
Assembly.
5. Install the DT-52263-5 Radiator Cooler Drain
Adapter into the upper transmission oil cooler line
port of the transmission oil cooler.
6. Install the DT-45096-31 adapter (3) over the
removed transmission oil cooler line (2) to prevent
any fluid spillage.
Page 8 August, 2019 Bulletin No.: 18-NA-355
7. Place the hose in the GE-47716-2 Graduated
Measuring Bucket, utilizing a Spring Clamp to
retain the hose.
8. Raise the vehicle.
5182541
9. Install the DT-45096-31 adapter (1) to the
DT-51190 fluid fill adapter (2).
3723844
10. Remove the level set plug (1) from the
transmission oil pan.
3723839
Important: DO NOT overtighten the DT-51190 as it
can be damaged by excessive torque. Do not
exceed 9Y(80 lb in).
11. Install the DT-51190/DT-45096-31 assembly and
hand tighten.
12. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter (2).
13. Lower the vehicle.
Caution: DO NOT REMOVE MORE THAN 3 QTS OF
FLUID AS IT COULD CAUSE FLUID PUMP
CAVITATION AND POSSIBLY DAMAGE THE
TRANSMISSION.
14. Utilizing the graduated bucket, start the engine and
run 30-45 seconds until 3 quarts of fluid is
expelled.
15. Shut the engine off immediately.
16. Connect the DT-45096 to the vehicle battery
12 volts and connect shop air to the air connection.
5181027
Bulletin No.: 18-NA-355 August, 2019 Page 9
Important: ADDING TOO MUCH FLUID TO THE
TRANSMISSION MAY CAUSE FLUID TO BE
EXPELLED FROM THE VENT SYSTEM. DO NOT
OVERFILL THE TRANSMISSION.
17. Switch the DT-45096 TransFlow to Flow and add
4 quarts of HP to the transmission.
5181020
18. Set the TransFlow switch to idle (Reducing fluid
level in the TransFlow from 20–16).
19. Switch the TransFlow DT-45096 to Flow and start
the engine:
19.1. 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 cylinder (Reducing fluid level
in the TransFlow from 16–12).
Note: DO NOTadd additional transmission fluid until
the 4 quarts of oil have been removed from the
transmission (Reducing fluid level in the TransFlow
from 12–8).
19.2. Repeat step 19.1.
19.3. 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).
5181401
19.4. Shut the engine off once 16 quarts of oil
have been collected.
19.5. Properly dispose of the collected
transmission fluid.
20. Remove the DT-52263-5 Radiator Cooler Drain
Adapter and DT-52263-1 Block Adapter from the
transmission oil cooler.
21. Remove the DT-45096-31 from the transmission oil
cooler line and install the transmission oil cooler
line using a new retaining clip.
22. Install the engine upper air filter box back into
position.
23. Partially raise the vehicle.
24. Start the engine.
25. Using care, shift the transmission through all
forward ranges and Reverse.
26. Shift the transmission into Park.
27. Perform the Transmission Fluid Level and
Condition Check outlined below in this procedure:
27.1. Get the transmission fluid temperature to the
proper temperature.
27.2. Raise the vehicle and remove the DT-51190/
DT-45096-31 assembly.
27.3. Install the level set plug.
Tighten
Tighten the plug to 9Y(80 lb in).
Page 10 August, 2019 Bulletin No.: 18-NA-355
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 V8 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.
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.
Bulletin No.: 18-NA-355 August, 2019 Page 11
5181307
Note: Upper air filter box removed for clarity.
3. Remove the upper cooler line from the
transmission oil cooler.
4. Install the DT-52263-2 Cooler Line Plug into the
radiator cooler.
5. Install the DT-52263-4 Hose onto DT-52263-1
Block Assembly install the DT-52263-4 onto the
removed transmission oil cooler line.
6. Place the hose of the DT-52263-1 in the
GE-47716-2 Graduated Measuring Bucket,
utilizing a Spring Clamp to retain the hose.
7. Raise the vehicle.
5182541
8. Install the DT-45096-31 adapter (1) to the
DT-51190 fluid fill adapter (2).
3723844
9. Remove the level set plug (1) from the
transmission oil pan.
3723839
Important: DO NOT overtighten the DT-51190 as it
can be damaged by excessive torque. Do not
exceed 9Y(80 lb in).
10. Install the DT-51190/DT-45096-31 assembly and
hand tighten.
11. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter (2).
12. Lower the vehicle.
Caution: DO NOT REMOVE MORE THAN 3 QTS OF
FLUID AS IT COULD CAUSE FLUID PUMP
CAVITATION AND POSSIBLY DAMAGE THE
TRANSMISSION.
13. Utilizing the graduated bucket, start the engine and
run 30-45 seconds until 3 quarts of fluid is
expelled.
Page 12 August, 2019 Bulletin No.: 18-NA-355
14. Shut the engine off immediately.
15. Connect the DT-45096 to the vehicle battery
12 volts and connect shop air to the air connection.
5181027
Important: ADDING TOO MUCH FLUID TO THE
TRANSMISSION MAY CAUSE FLUID TO BE
EXPELLED FROM THE VENT SYSTEM. DO NOT
OVERFILL THE TRANSMISSION.
16. Switch the DT-45096 TransFlow to Flow and add
4 quarts of HP to the transmission.
5181020
17. Set the TransFlow switch to idle (Reducing fluid
level in the TransFlow from 20–16).
18. Switch the TransFlow DT-45096 to Flow and start
the engine:
18.1. 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 cylinder (Reducing fluid level
in the TransFlow from 16–12).
Note: DO NOTadd additional transmission fluid until
the 4 quarts of oil have been removed from the
transmission (Reducing fluid level in the TransFlow
from 12–8).
18.2. Repeat step 18.1.
18.3. 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).
5181401
18.4. Shut the engine off once 16 quarts of oil
have been collected.
18.5. Properly dispose of the collected
transmission fluid.
19. Remove the DT-52263-4 and DT-52263-1 Block
Adapter from the transmission oil cooler line.
20. Remove the DT-52263-2 Cooler Line Plug from the
transmission oil cooler at the radiator and install
the transmission oil cooler line using a new
retaining clip.
Bulletin No.: 18-NA-355 August, 2019 Page 13
21. Install the engine upper air filter box back into
position.
22. Partially raise the vehicle.
23. Start the engine.
24. Using care, shift the transmission through all
forward ranges and Reverse.
25. Shift the transmission into Park.
26. Perform the Transmission Fluid Level and
Condition Check outlined below in this procedure:
26.1. Get the transmission fluid temperature to the
proper temperature.
26.2. Raise the vehicle and remove the DT-51190/
DT-45096-31 assembly.
26.3. Install the level set plug.
Tighten
Tighten the plug to 9Y(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, CTS and
ATS 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.
2. Raise the vehicle on a hoist.
5182245
3. Remove the lower/front transmission oil cooler
line (2) at the rear differential.
4. Install the DT-52263-2 Cooler Line Plug (1) into the
rear differential to prevent fluid loss.
5. Install one end of the DT-52263-4 hose (4) to the
open port of the DT-52263-1 Block Assembly (3).
6. Install the other end of the DT-52263-4 hose to the
transmission oil cooler line.
7. Place the hose in the GE-47716-2 Graduated
Measuring Bucket, utilizing a Spring Clamp to
retain the hose.
5182541
8. Install the DT-45096-31 adapter (1) to the
DT-51190 fluid fill adapter (2).
Page 14 August, 2019 Bulletin No.: 18-NA-355
3723844
9. Remove the level set plug (1) from the
transmission oil pan.
3723839
Important: DO NOT over tighten the DT-51190 as it
can be damaged by excessive torque. Do not
exceed 9Y(80 lb in).
10. Install the DT-51190/DT-45096-31 assembly and
hand tighten.
11. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter (2).
12. Lower the vehicle.
Caution: DO NOT REMOVE MORE THAN 3 QTS OF
FLUID AS IT COULD CAUSE FLUID PUMP
CAVITATION AND POSSIBLY DAMAGE THE
TRANSMISSION.
13. Utilizing the graduated bucket, start the engine and
run 30-45 seconds until 3 quarts of fluid is
expelled.
14. Shut the engine off immediately.
15. Connect the DT-45096 to the vehicle battery
12 volts and connect shop air to the air connection.
5181027
16. Switch the TransFlow DT-45096 to Flow and add
4 quarts of HP to the transmission.
17. Set the TransFlow switch to idle (Reducing fluid
level in the TransFlow from 20–16).
18. Switch the TransFlow DT-45096 to Flow and start
the engine:
18.1. 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).
Note: DO NOTadd additional transmission fluid until
the 4 quarts of oil have been removed from the
transmission (Reducing fluid level in the TransFlow
from 12–8).
18.2. Repeat step 18.1.
18.3. 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).
Bulletin No.: 18-NA-355 August, 2019 Page 15
5181401
18.4. Shut the engine off once 16 quarts of fluid
have been collected.
18.5. Properly dispose of the collected
transmission fluid.
19. Raise the vehicle.
20. Remove the DT-52263-2 Cooler Line Plug from
rear differential and install the transmission oil
cooler line using a new retainer clip.
21. Remove the DT-52263-4 from the transmission oil
cooler line.
22. Install the transmission oil cooler line using a new
retainer clip.
23. Partially lower the vehicle.
24. Using care, shift the transmission through all
forward ranges and Reverse.
24.1. Get the transmission fluid temperature to the
proper temperature.
24.2. Raise the vehicle and remove the DT-51190/
DT-45096-31 assembly.
24.3. Install the level set plug.
Tighten
Tighten the plug to 9Y(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 – Corvette and CT6
Important: The Drain and Fill Procedure Will Need
to be Performed Three Times.
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 24 quarts of HP fluid.
2. Raise the vehicle.
3. Using care, remove the transmission oil pan and
drain the transmission fluid.
4. Install the transmission oil pan.
5182541
5. Install the DT-45096-31 adapter (1) to the
DT-51190 fluid fill adapter (2).
3723844
Page 16 August, 2019 Bulletin No.: 18-NA-355
6. Remove the level set plug (1) from the
transmission oil pan.
3723839
Important: DO NOT over tighten the DT-51190 as it
can be damaged by excessive torque. Do not
exceed 9Y(80 lb in).
7. Install the DT-51190/DT-45096-31 assembly and
hand tighten.
8. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter (2).
9. Connect the DT-45096 TransFlow to the vehicle
battery 12 volts and connect shop air to the air
connection.
10. Switch the DT-45096 TransFlow to Flow and fill the
transmission with 8 quarts of transmission fluid.
10.1. Switch the DT-45096 TransFlow to idle.
11. Partially lower the vehicle and run the transmission
through all 8 forward gears, Reverse and Neutral.
12. Repeat steps 2-4 and 9-10 for 2nd drain and fill.
13. Repeat step 2-3, clean the transmission oil pan
and magnet, repeat step 4 and step 10-11.
14. Perform the Transmission Fluid Level and
Condition Check outlined below in this procedure:
14.1. Get the transmission fluid temperature to the
proper temperature.
14.2. Raise the vehicle and remove the DT-51190/
DT-45096-31 assembly.
14.3. Install the level set plug.
Tighten
Tighten the plug to 9Y(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.
Transmission Fluid Level and Condition
Check
This procedure checks both the transmission fluid level,
as well as the condition of the fluid itself. Because the
transmission on this vehicle is not equipped with a fill
tube and dipstick, a tube in the bottom pan is used to
set the fluid level.
Warning: The transmission fluid level must be
checked when the transmission fluid temperature
(TFT) is between 35–45°C (95–113°F). If the TFT is
not within this range, either idle or brake torque the
vehicle to raise the fluid temperature, or shut off the
vehicle to allow the fluid to cool as required. Setting
the fluid level with a TFT outside this range will
result in either an under or over-filled transmission.
TFT>45°C=under-filled, TFT<35°C=over-filled. An
under-filled transmission will cause premature
component wear or damage. An over-filled
transmission will cause fluid to discharge out the
vent tube, possibly causing a fire that may result in
serious bodily injury or severe vehicle damage,
fluid foaming, or pump cavitation.
Note: Silverado, Sierra, Yukon and Escalade Models
equipped with a thermal bypass valve, the transmission
fluid level should be checked only after the TFT has
reached or exceeded an operating temperature of 90°C
(194°F). Once the TFT has reached or exceeded 90°C
(194°F), then turn OFF the vehicle and allow the TFT to
cool back down to 35-45°C (95-113°F) before checking
the fluid level as required. Reaching or exceeding an
operating temperature of 90°C (194°F) opens the
bypass valve and allows the cooler to fill up with fluid,
which will result in a more accurate fluid level check.
1. Observe the TFT using the driver information
center (DIC) or a scan tool.
2. Start and idle the engine.
3. Depress the brake pedal and move the shift lever
through each gear range.
3.1. Pause for at least 3 seconds in each range.
3.2. Move the shift lever back to PARK.
3.3. Ensure the engine RPM is low
(500–800 RPM).
4. Allow the engine to idle for a minimum time of
1 minute.
Caution: THE ENGINE MUST BE RUNNING when the
trans oil level check plug is removed or excessive fluid
loss will occur, resulting in an under-filled condition. An
under-filled transmission will cause premature
component wear or damage.
5. Raise the vehicle on a hoist.
⇒ The vehicle must be level, with the engine
running and the shift lever in the PARK range.
Note: Continue to monitor the TFT. If the TFT is not
within the specified values, reinstall the trans oil level
check plug and repeat the previous steps.
6. Remove the transmission oil level check plug (1)
from the transmission fluid pan.
Bulletin No.: 18-NA-355 August, 2019 Page 17
7. Allow any fluid to drain.
• If the fluid is flowing as a steady stream, wait
until the fluid begins to drip.
• If no fluid comes out, add fluid until fluid drips
out. Refer to Transmission Fluid Fill Procedure
in SI.
8. Reinstall the transmission oil level check plug.
Tighten
Tighten the plug to 9Y(80 lb in).
9. Inspect for external leaks. Refer to Fluid Leak
Diagnosis in SI.
Parts Information
Note: Only select the parts that coincide with the repair
performed.
Causal
Part
Description Part
Number
Qty
X Mobil 1 Synthetic
LV ATF HP
(Available only
through Local GM
Oil Distributors)
19417577
(US –
1 quart)
19418066
(Canada –
0.946L/1 qt)
20
24 (CT6,
Corvette)
N/A
Drum
55 gallon
19417904
(US)
1
N/A
RETAINER,
TRANS FLUID
CLR PIPE FTG
24205103 2
N/A SEAL, TRANS
FLUID CLR PIPE 23135703 1
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
8480818* Fluid Exchange 1.1 hrs
Add CT6 AWD Triple Drain
and Fill
1.0 hr
Add CT6 RWD Triple Drain
and Fill
1.6 hrs
Add Corvette RWD Triple Drain
and Fill
1.6 hrs
Add DT-45096 Prep (Not
required unless the fluid is
not Mobil 1 Synthetic LV
ATF HP)
0.1 hr
*This is a unique Labor Operation for Bulletin use only.
Version 5
Modified
Released January 17, 2019
Revised March 01, 2019 – Added Canada, Middle East Operations, Mexico and Export
Region reference to Attention statement, added Canada and Middle East Operations to
Involved Region or Country, added printing information to the Important statement under
PicoScope Test section and added fluid part number for Canada, a Note and two
additional part numbers in the Parts Information section.
Revised May 21, 2019 – Added Date Breakpoints in Models section, Fluid Exchange
Procedure for V8 Camaro, additional information to TCC Shudder condition paragraph at
the end of each procedure, added missing 4 quarts of HP fluid to the vehicles with Rear
Differential Cooler sections and added Pico and GDS screen shots.
Revised July 08, 2019 – Updated the Warranty Information section, removed all of the
Diagnostic and Pico testing information.
Revised July 29, 2019 – Update Labor Operation time to 1.1 hrs.

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