20-NA-142

Service Bulletin
Bulletin No.:
20-NA-142
Date:
May, 2022
TECHNICAL
Subject:
Shudder/Surging While Driving
Attention: This bulletin only applies to vehicles with 50,000 km (30,000 miles) or less. For vehicles
with over 50,000 km (30,000 miles), the torque converter and transmission oil filter
should be replaced following published Service Information.
Brand:
Model:
Model Year:
from
Express
Suburban
2015
Silverado
Silverado LD
Silverado 2500/3500
Chevrolet
Silverado 1500
(New Model)
Silverado 1500 - LTD
(RPO J21, VIN Digit
12 = 4 or less)
Silverado 1500 - New
(RPO J22, VIN Digit
12 = 5 or greater)
Tahoe
Savana
Sierra
Sierra Limited
Sierra 2500/3500
GMC
Sierra 1500
(New Model)
Sierra 1500 - Limited
(RPO J21, VIN Digit
12 = 4 or less)
Sierra 1500 - New
(RPO J22, VIN Digit
12 = 5 or greater)
Yukon
to
VIN:
from
to
Engine:
Transmission:
2022
2018
2019
2019
2022
2019
2021
2022
2022
2015
2022
2015
2019
MYC, MYD
2022
2018
2019
2022
2019
2021
2022
2022
2015
2022
Involved Region or Country
North America, Russia, Middle East, Israel, Palestine, Chile, Columbia, Ecuador,
Paraguay, Peru and Thailand.
Condition
Some customers may comment that a surging condition is felt when driving.
Some technicians may find while performing Torque Converter Diagnosis per Service
Information, may identify the surging as a torque converter shudder condition.
Cause
This condition may be caused by additives in the transmission fluid may have been
depleted during vehicle operation.
– Some of these additives assisted with regulating a consistent slip rate of the clutches.
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
May, 2022
Bulletin No.: 20-NA-142
Note: This bulletin should only be used on vehicles with 50,000 km (30,000 miles) or
less. For vehicles with over 50,000 km (30,000 miles) the torque converter and
transmission oil filter should be replaced following published Service Information.
1. Raise the vehicle.
2. Remove the transmission pan.
Correction
5360216
3.
4.
5.
6.
7.
8.
9.
10.
• If metallic debris is present (similar to graphic above), remove transmission and
replace the torque converter and replace the transmission filter. Refer to Torque
Converter Replacement in SI.
• If metallic debris is not present drain and clean the oil pan and reinstall
transmission oil pan.
Fill the transmission with 6 quarts of DEXRON VI Transmission Fluid following
published Service Information.
Lower the vehicle to a safe level on the hoist and operate the transmission through
all 6 gear forward ranges, reverse and neutral.
Remove transmission oil pan and drain, reinstall the oil pan.
Fill the transmission with 6 quarts of DEXRON VI Transmission Fluid following
published Service Information.
Lower the vehicle to a safe level on the hoist and operate the transmission through
all 6 gear forward ranges, reverse and neutral.
Remove transmission oil pan and drain, clean pan and replace the transmission
filter.
Fill the transmission with 6 quarts of DEXRON VI Transmission Fluid.
Set the fluid level following published Service Information.
Service Procedure
Vehicles Equipped with a Fluid Fill Tube
Note: Refer to TSB 21-NA-199 to verify in the Thermal
Bypass Valve (TBV) requires updating.
1. Remove the transmission Thermal Bypass Valve
(TBV) and or cooler lines.
2. Install DT-53040 Adapter, Trans Flushing Tool to
the cooler line ports on the transmission reusing
the existing cooler line seal.
3. Place the drain hose from DT-53040 into
GE-47716-2 Graduated Bucket.
4. Lower the vehicle.
5. Through the transmission fluid fill tube add 6 quarts
of DEX VI Transmission fluid.
6. Start the engine and drain 4 quarts of transmission
fluid into the GE-47716-2 Graduated Bucket then
shut the engine off immediately.
7. Through the transmission fluid fill tube add 4 quarts
of DEX VI Transmission fluid.
8. Start the engine and drain 4 quarts of transmission
fluid into GE-47716-2 Graduated Bucket then shut
the engine off immediately.
9. Through the transmission fluid fill tube add 4 quarts
of DEX VI Transmission fluid
10. Raise the vehicle, remove the DT-53040 and
reinstall the Thermal Bypass Valve (TBV) and or
cooler lines installing a new Cooler Line Seal.
11. Tighten the bolt (2) to 22 nm (16 lb ft).
Bulletin No.: 20-NA-142
May, 2022
Page 3
12. Lower the vehicle.
13. Set the fluid level to the proper level following
Service Information.
Initial TransFlow Flush Machine Shop
Important: The prepping procedure only needs to be
completed if the DT-45096 supply reservoir does not
have DEX VI fluid in it.
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).
4. Remove the transmission oil thermal bypass valve/
cooler pipe assembly from the transmission.
5. Install the DT-53040 Adapter Block Assembly to
the transmission, reusing the seal from the
transmission oil cooler pipe assembly.
6. Tighten the bolt (2) to 22 nm (16 lb ft).
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
1. Fill the DT-45096 with 17 quarts of DEX VI fluid.
2. Raise the vehicle on a hoist.
5181401
7. Place the hose in the GE-47716-2 Graduated
Measuring Bucket, utilizing a Spring Clamp to
retain the hose.
8. Remove the level set plug from the transmission.
Page 4
May, 2022
Bulletin No.: 20-NA-142
Important: DO NOT over tighten the DT-51190 as it
can be damaged by excessive torque. DO NOT exceed
9 Y (80 lb in).
5122324
9. Install the DT-51190/DT-45096-31 assembly and
hand tighten as shown in the graphic above.
10. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter.
11. Lower the vehicle.
12. Connect the DT-45096 to the vehicle battery 12
volts and connect shop air to the air connection.
5181027
13. Switch the DT-45096 TransFlow to Flow and add 6
quarts of DEX VI to the transmission. (Reducing
fluid level in the TransFlow from 17–11).
14. Switch the TransFlow to Idle.
Bulletin No.: 20-NA-142
May, 2022
15. Utilizing the graduated bucket, start the engine and
run 30- 45 seconds until 4 quarts of fluid is
expelled.
16. Shut the engine off immediately.
17. Switch the DT-45096 TransFlow to Flow and add 4
quarts of HP to the transmission (Reducing fluid
level in the TransFlow from 11–7).
18. Switch the DT-45096 TransFlow to Idle.
19. Utilizing the graduated bucket, start the engine and
run 30- 45 seconds until 4 quarts of fluid is
expelled.
20. Switch the DT-45096 TransFlow to Flow (Reducing
fluid level in the TransFlow from 7–2).
21. Shut the engine off.
22. Raise the vehicle.
23. Disconnect the DT-45096 TransFlow feed (supply)
line from the DT-45096-31.
24. Using care, remove DT-45096-31/DT-51190 as an
assembly.
26. Tighten the bolt (2) to 22 nm (16 lb ft).
Note: Review TSB 21-NA-199 to see the Thermal
Bypass Valve (TBV) needs to be updated.
Page 5
30. Set the fluid level following published Service
Information procedures.
Parts Information
Causal
Part
27. Install the level set plug. Tighten the plug to 9 nm
(80 lb in).
28. Remove the DT-53040 Adapter and install the
Thermal Bypass Valve/Cooler Line Set using a
new seal.
29. Lower the vehicle leaving the wheels off the
ground. Start and run the engine through all
forward gears and reverse.
Description
Part
Number
N/A
Drum, 55
Gallon (U.S.)
19293024/
19420008
(Available
through local
GM Oil
Distributor)
N/A
Drum, 208 Liter
(Canada)
19420144
N/A
3 - 4.73 Liter
Containers
(Canada)
19420143
N/A
6 - 1 Liter
Containers
(Canada)
19420142
N/A
1 Qt (U.S.)
88864060/
19421240
(Available
through local
GM Oil
Distributor),
88865601
(GM CCA
Stock Order)
N/A
Kit, Filter
24236933
N/A
Seal, Trans Fluid
Cooler Piper
Fitting
23135703
Qty
As Required
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
8481018*
Automatic Transmission Fluid, Fluid Pan and/or Filter
Replacement
1.2 hr
Add
Fluid Exchange Procedure for Vehicles Equipped with a Fluid
Fill Tube
0.6 hr
Add
2019 – 2022 Silverado 1500/Sierra 1500 (New Body Style
T1XX) Pan Removal, Inspection and Filter Replacement
1.5 hr
Add
Fluid Exchange Procedure for 2019 – 2022 Silverado 1500/
Sierra 1500 (Not Equipped with a Fluid Fill Tube)
1.0 hr
*This is a unique Labor Operation for Bulletin use only.
Page 6
May, 2022
Bulletin No.: 20-NA-142
Version
9
Modified
Released July 06, 2020
Revised July 20, 2020 - Update Parts Information Section.
Revised September 08, 2020 - Removed the 1 gallon p/n 88865765 from the Parts
Information section.
Revised October 15, 2020 - Added 2020 to Model Year.
Revised November 19, 2020 - Added Tahoe to Models section, changed 2 part #’s and
added regions.
Revised January 11, 2021 - Update U.S. part numbers in the Parts Information section.
Revised February 09, 2021 - Updated Procedure in Correction section, Removed Service
Procedure section and Updated Labor Operation Time.
Revised September 13, 2021 - Added Attention statement, Note to Correction section
and Removed Reference to PIP5504F from Condition section.
Revised May 18, 2022 - Added 2021–2022 to Model Years, Added Service Procedure
section, Added Pipe Seal to Parts section and Updated Warranty Information 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.
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