20-NA-142

Bulletin No.:
Service Bulletin
Date:
20-NA-142
August, 2023
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
to
2015
2020
Express
Suburban
Silverado LD
Chevrolet
2022
2022
Tahoe
2015
2020
2015
2019
2022
2018
2019
2023
Sierra 1500
(New Model)
2019
2021
Sierra 1500 - Limited
(RPO J21, VIN Digit
5 = 8/9)
2022
2022
Yukon
2015
2020
Copyright 2023 General Motors LLC. All Rights Reserved.
Transmission:
2019
Silverado 1500 - LTD
(RPO J21, VIN Digit
5 = W/Y)
Sierra 2500/3500
Engine:
2023
2021
Sierra
GMC
2019
2019
Sierra Limited
to
2018
Silverado 1500
(New Model)
Savana
from
2022
Silverado
Silverado 2500/3500
VIN:
MYC, MYD
Page 2
August, 2023
Bulletin No.: 20-NA-142
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.
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
• 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, replace transmission
fluid filter and reinstall transmission oil pan following Service Information and
follow the Service Procedure below that corresponds with the vehicle fill setup.
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
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
Bulletin No.: 20-NA-142
August, 2023
Page 3
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).
12. Lower the vehicle.
13. Set the fluid level to the proper level following
Service Information.
Service Procedure: Vehicles equipped
with a level set plug
Initial TransFlow Flush Machine Setup
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
August, 2023
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
August, 2023
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 fluid 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.
Note: Review TSB 21-NA-199 to see the Thermal
Bypass Valve (TBV) needs to be updated.
25. Install the Thermal Bypass Valve (TBV) and or
cooler lines installing a new Cooler Line Seal.
26. Tighten the bolt (2) to 22 nm (16 lb ft).
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.
30. Set the fluid level following published Service
Information procedures.
Page 5
Parts Information
Note: Only select the parts that coincide with the repair
performed. Replace the part with the P/N outlined in the
Electronic Parts Catalog (EPC) in accordance with the
vehicle VIN.
Causal
Part
Description
Part
Number
Qty
N/A
Drum, 55
Gallon (U.S.)
19293024/
19420008
(Available
through local
GM Oil
Distributor)
N/A
Drum, 208 Liter
(Canada)
19421427
N/A
3 - 4.73 Liter
Containers
(Canada)
19421426
N/A
6 - 1 Liter
Containers
(Canada)
19421425
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
1
N/A
Seal Exh /Dounut
20987829
(LC8 L20
L96
LV1 L8T)
1
N/A
Seal/Metal
O-Ring
15077362
(LC8 L20
L97
LV1 L8T)
1
N/A
Gasket
15027074
(LC8 L20
L97
LV1 L8T)
1
N/A
Gasket
55597347
(LWN
(Diesel)
1
N/A
Seal/Metal
O-Ring
15077362
(L83
L86 LV3)
1
N/A
Seal Exh /Dounut
15035747
(L83
L86 LV3)
1
N/A
Seal/Metal
O-Ring
15077362
(L83 LV3)
1
N/A
Seal Exh /Dounut
15035747
(L82 LV3)
1
N/A
Seal Exh /Dounut
15035747
(L82 LV3)
1
As Required
Page 6
Causal
Part
August, 2023
Description
Part
Number
N/A
Seal/Metal
O-Ring
15077362
(L82 LV3)
1
N/A
Seal/Metal
O-Ring
15077362
(L96
LC8 L8T)
1
N/A
Seal Exh /Dounut
20987829
(L96
LC8 L8T)
1
Bulletin No.: 20-NA-142
Qty
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*
All Automatic Transmission Fluid, Fluid Pan and/or Filter
Replacement
1.2 hr
Add
For Only 2019 – 2022 Silverado 1500/Sierra 1500 (New Body
Style T1XX) Pan Removal, Inspection and Filter Replacement
1.5 hr
Add**
Fluid Exchange Procedure for All Vehicles That Are Not
Equipped with a Fluid Fill Tube
1.0 hr
Add
Fluid Exchange Procedure for All Vehicles That Are Equipped
with a Fluid Fill Tube
0.6 hr
*This is a unique Labor Operation for Bulletin use only.
**For 2019 – 2022 Silverado 1500/Sierra 1500 are not supplied with a fluid fill tube and may require additional work.
Version
13
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.
Revised June 15, 2022 - Updated 2022 Silverado/Sierra Models, Updated Correction
section and Revised Service Information Titles.
Revised November 29, 2022 - Updated Parts Information and Warranty Information
sections.
Revised January - 11, 2023 - Changed HP to Fluid in Step 17.
Revised July 26, 2023 - Added 2023 to Applicable Vehicles and Updated the 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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