20-NA-142 Service Bulletin/Repair Instructions

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

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