Service Bulletin Bulletin No.: 18-NA-355 Date: August, 2019
Bulletin No.:Service BulletinDate:18-NA-355August, 2019TECHNICALSubject:Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH(40 and 128 KM/H) at Steady SpeedAttention: This Bulletin only applies to vehicles sold in the U.S., Canada and Middle EastOperations (MEO). Mexico and Export Regions should follow Bulletin 19-NA-018.Model 162018fromtoEngine:(2.0L, 2.5L, 3.0L,3.6L, 5.3L, 6.2L)Transmission:(8L45, 8L90Automatic)Feb.1, 2019LCV, LGX, LTG,LT4, LF4M5N, M5T, M5ULGX, LGW, LTGM5N, b.1, 2019LGX, LTG, LT1M5T, M5UColorado20172019March1, 2019LGZM5TCorvette20152019Feb.1, 2019LT1, LT4M5USilveradoModels20152018EOPL83, L86, L8BM5U, M5XCanyon20172019March1, 2019LGZM5TSierraModels20152018L83, L86, L8BM5U, M5XYukonModels2015L86M5UChevroletGMCDate Breakpoint:SOPEOP2017Involved Region or CountryUnited States, Canada, Middle East Operations (MEO)ConditionSome customers may comment that their vehicle is experiencing a shake and/or shudderduring light throttle acceleration between 25 and 80 mph (40 and 128 km/h) steady statedriving when transmission is not actively shifting gears. The condition may be described as if they are driving over rumble strips or aconcrete road surface with rough expansion joints.CauseThis condition may be due to Torque Converter Clutch (TCC) Shudder.CorrectionVehicles that are presented with TCC shudder should have the appropriate fluidexchange procedure completed. Diagnosis beyond the customer compliant is notrequired 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 SIdiagnostics. These vehicles are already equipped with the latest HP fluid.Copyright 2019 General Motors LLC. All Rights Reserved.
Page 2August, 2019Special ToolsDT-52263 Transmission Fluid Exchange Kit: DT-52263-1 Block Assembly (includes fluid drainhose, spring clamp) DT-52263-2 Cooler Line Plug (qty 3) (use with reardifferential cooler and Camaro V8 non reardifferential cooler) DT-52263-3 ½” Cooler Line Flush Adapter for2019 Silverado and Sierra DT-52263-4 3/8” Hose Adapter (6” long with 2hose clamps) DT-52263-5 Radiator Cooler Drain Adapter3763203 DT-51190 Transmission Oil Fill AdapterGE-47716-2 Graduated Bucket1215917DT-45096 TransFlow Cooler Flush Machine4733125DT-45096-31 TransFlow Adapter (one of two piecesfrom DT-45096-30)5181938 Bulletin No.: 18-NA-355
Bulletin No.: 18-NA-355August, 2019Service ProcedurePage 31. Fill the DT-45096 with 20 quarts of HP fluid.2. Raise the vehicle on a hoist.Initial TransFlow Flush Machine SetupImportant: The prepping procedure only needs to becompleted if the DT-45096 supply reservoir hasDEXRON VI fluid in it and has not been converted touse the new blue label Mobil 1 Synthetic LV ATF HPfluid.Note: The prepping procedure only needs to becompleted if HP fluid is not in the supply reservoir.1. Connect the TransFlow adapter DT-45096-31 tothe supply line of the DT-45096 TransFlowmachine.51825413. Install the DT-45096-31 TransFlow adapter (1) tothe DT-51190 fluid fill adapter (2).51808842. Switch the DT-45096 TransFlow to Idle.3. Connect power leads to the vehicle 12-volt DCsupply.4. Turn the TransFlow main switch ON.5. Connect air supply to the DT-45096.6. Place the TransFlow supply hose with adapterDT-45096-31 into a waste reservoir using care notto spill the expelled fluid.7. Switch the DT-45096 TransFlow to Flow and allowall the fluid in the supply reservoir to be removedand placed in the waste reservoir.8. Switch the control switch back to idle.Fluid Exchange Procedure - Colorado, Canyon,Silverado, Sierra, Yukon Denali and EscaladeModels with an Accessible Transmission OilCooler Line Block AssemblyImportant: This procedure must be followed aspublished. The exchange process is required to obtainproper level of new blue label Mobil 1 Synthetic LV ATFHP fluid. Intermixing of other types of transmission fluidor aftermarket additive packages will result in a lowconcentration level of new fluid and will not providesatisfactory results.51805634. Remove the transmission oil cooler pipe assemblyfrom the transmission.5. Install the DT-52263-1 Adapter Block Assembly(1), reusing the seal from the transmission oilcooler pipe assembly.6. Tighten the bolt (2) to 22 Y (16 lb ft).7. Place the hose (3) in the GE-47716-2 GraduatedMeasuring Bucket, utilizing a Spring Clamp toretain the hose.
Page 4August, 2019Bulletin No.: 18-NA-35513. Shut the engine off immediately.14. Connect the DT-45096 to the vehicle battery12 volts and connect shop air to the air connection.37238448. Remove the level set plug (1) from thetransmission.Important: DO NOT over tighten the DT-51190 as itcan be damaged by excessive torque. DO NOT exceed9 Y (80 lb in).9. Install the DT-51190/DT-45096-31 assembly andhand tighten as shown in the graphic above.518102715. Switch the DT-45096 TransFlow to Flow and add4 quarts of HP to the transmission.5181020372383910. 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 QUARTSOF FLUID AS IT COULD CAUSE FLUID PUMPCAVITATION AND POSSIBLY DAMAGE THETRANSMISSION.12. Utilizing the graduated bucket, start the engine andrun 30- 45 seconds until 3 quarts of fluid isexpelled.16. Switch the DT-45096 TransFlow to Idle (Reducingfluid level in the TransFlow from 20–16).17. Switch the TransFlow DT-45096 to Flow and startthe engine:17.1. Add a maximum of 4 quarts of HP Fluid tothe transmission, turn the TransFlow switchto idle once 4 quarts have been added, whileallowing 4 additional quarts of oil to fill theDT-graduated bucket (Reducing fluid level inthe TransFlow from 16 – 12).
Bulletin No.: 18-NA-355August, 2019Note: DO NOT add additional transmission fluid untilthe 4 quarts of oil have been removed from thetransmission (Reducing fluid level in the TransFlowfrom 12–8).Page 524. If equipped, remove the Thermal By-Pass Blockfrom 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 thetransmission while allowing 5 additionalquarts of oil to fill the DT-graduated bucket(Reducing fluid level in the TransFlow from8 – 3).176257725. Install DT-45096-31 adapters (1) to thetransmission oil cooler lines.26. Connect the DT-45096 TransFlow to theDT-45096-31 adapters.518140118.19.20.21.22.17.4. Shut the engine off once 16 quarts of fluidhave been collected.17.5. Properly dispose of the expelledtransmission 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 anassembly.Remove the DT-51190 fluid fill adapter fromDT-45096-31 hose.Install the level set plug.TightenTighten the plug to 9 Y (80 lb in).23. Remove DT-52263-1 Adapter Block Assemblyfrom the transmission.521046127. Switch the DT-45096 TransFlow to Flush.28. Flush the vehicle cooler and lines using 2 quarts ofHP fluid. Flush 1 quart of fluid through the lines, thenswitch the hose connections and flush 1 quartof fluid in the opposite direction.29. Remove the DT-51190/DT-45096-31 assembly.30. If equipped, install the Thermal By-Pass Block fromthe cooler pipes on the Escalade, Silverado, Sierraand Yukon Models.
Page 6August, 201931. Install the transmission oil cooler pipe using a newcooler block seal.32. Partially lower the vehicle.33. Start the engine.34. Using care, shift the transmission through allforward ranges and Reverse.35. Shift the transmission into Park.36. Perform the Transmission Fluid Level andCondition Check outlined below in this procedure:36.1. Get the transmission fluid temperature to theproper temperature.36.2. Install the level set plug.TightenTighten the plug to 9 Y (80 lb in).The TCC shudder condition should be directionalimproved immediately after the fluid exchangeprocedure. It may take up to 320 km (200 mi) for theTCC shudder condition to be eliminated. It is not arequirement for the dealer to drive the vehicle 320 km(200 mi). The customer should be advised that the fulleffect will take up to 320 km (200 mi) and a minimum oftwo cold to operating temperature drive cycles.Fluid Exchange Procedure - Camaro (ExceptCamaro V8-See Procedure below for CamaroV8), CTS and ATS Not Equipped with a RearDifferential CoolerImportant: This procedure must be followed aspublished. The exchange process is required to obtainproper level of new blue label Mobil 1 Synthetic LV ATFHP fluid. Intermixing of other types of transmission fluidor aftermarket additive packages will result in a lowconcentration level of new fluid and will not providesatisfactory results.1. Fill the DT-45096 with 20 quarts of HP fluid.Bulletin No.: 18-NA-355
Bulletin No.: 18-NA-355August, 2019Page 74194576Note: The MAF sensor must stay connected so that noDTCs will set.2. Separate the engine upper air filter box (1) from thelower air filter housing to gain access to the uppertransmission oil cooler line.51813225181307Note: Upper air filter box removed for clarity.3. Remove the cooler line from the transmission oilcooler.4. Install end of the DT-52263-5 Radiator CoolerDrain Adapter (1) to the DT-52263-1 BlockAssembly.5. Install the DT-52263-5 Radiator Cooler DrainAdapter into the upper transmission oil cooler lineport of the transmission oil cooler.6. Install the DT-45096-31 adapter (3) over theremoved transmission oil cooler line (2) to preventany fluid spillage.
Page 8August, 2019Bulletin No.: 18-NA-3557. Place the hose in the GE-47716-2 GraduatedMeasuring Bucket, utilizing a Spring Clamp toretain the hose.8. Raise the vehicle.51825419. Install the DT-45096-31 adapter (1) to theDT-51190 fluid fill adapter (2).3723839Important: DO NOT overtighten the DT-51190 as itcan be damaged by excessive torque. Do notexceed 9 Y (80 lb in).11. Install the DT-51190/DT-45096-31 assembly andhand 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 OFFLUID AS IT COULD CAUSE FLUID PUMPCAVITATION AND POSSIBLY DAMAGE THETRANSMISSION.14. Utilizing the graduated bucket, start the engine andrun 30-45 seconds until 3 quarts of fluid isexpelled.15. Shut the engine off immediately.16. Connect the DT-45096 to the vehicle battery12 volts and connect shop air to the air connection.372384410. Remove the level set plug (1) from thetransmission oil pan.5181027
Bulletin No.: 18-NA-355August, 2019Page 9Important: ADDING TOO MUCH FLUID TO THETRANSMISSION MAY CAUSE FLUID TO BEEXPELLED FROM THE VENT SYSTEM. DO NOTOVERFILL THE TRANSMISSION.17. Switch the DT-45096 TransFlow to Flow and add4 quarts of HP to the transmission.518102018. Set the TransFlow switch to idle (Reducing fluidlevel in the TransFlow from 20–16).19. Switch the TransFlow DT-45096 to Flow and startthe engine:19.1. Add a maximum of 4 quarts of HP Fluid tothe transmission, turn the TransFlow switchto idle once 4 quarts have been added, whileallowing 4 additional quarts of oil to fill theDT-graduated cylinder (Reducing fluid levelin the TransFlow from 16–12).Note: DO NOT add additional transmission fluid untilthe 4 quarts of oil have been removed from thetransmission (Reducing fluid level in the TransFlowfrom 12–8).19.2. Repeat step 19.1.19.3. Add a maximum of 5 quarts of HP Fluid tothe transmission while allowing 5 additionalquarts of oil to fill the DT-graduated bucket(Reducing fluid level in the TransFlow from8–3).518140120.21.22.23.24.25.26.27.19.4. Shut the engine off once 16 quarts of oilhave been collected.19.5. Properly dispose of the collectedtransmission fluid.Remove the DT-52263-5 Radiator Cooler DrainAdapter and DT-52263-1 Block Adapter from thetransmission oil cooler.Remove the DT-45096-31 from the transmission oilcooler line and install the transmission oil coolerline using a new retaining clip.Install the engine upper air filter box back intoposition.Partially raise the vehicle.Start the engine.Using care, shift the transmission through allforward ranges and Reverse.Shift the transmission into Park.Perform the Transmission Fluid Level andCondition Check outlined below in this procedure:27.1. Get the transmission fluid temperature to theproper temperature.27.2. Raise the vehicle and remove the DT-51190/DT-45096-31 assembly.27.3. Install the level set plug.TightenTighten the plug to 9 Y (80 lb in).
Page 10August, 2019Bulletin No.: 18-NA-355The TCC shudder condition should be directionalimproved immediately after the fluid exchangeprocedure. It may take up to 320 km (200 mi) for theTCC shudder condition to be eliminated. It is not arequirement for the dealer to drive the vehicle 320 km(200 mi). The customer should be advised that the fulleffect will take up to 320 km (200 mi) and a minimum oftwo cold to operating temperature drive cycles.Fluid Exchange Procedure – Camaro V8 NotEquipped with a Rear Differential CoolerImportant: This procedure must be followed aspublished. The exchange process is required to obtainproper level of new blue label Mobil 1 Synthetic LV ATFHP fluid. Intermixing of other types of transmission fluidor aftermarket additive packages will result in a lowconcentration level of new fluid and will not providesatisfactory results.1. Fill the DT-45096 with 20 quarts of HP fluid.4194576Note: The MAF sensor must stay connected so that noDTCs will set.2. Separate the engine upper air filter box (1) from thelower air filter housing to gain access to the uppertransmission oil cooler line.
Bulletin No.: 18-NA-355August, 2019Page 1151813073723844Note: Upper air filter box removed for clarity.3. Remove the upper cooler line from thetransmission oil cooler.4. Install the DT-52263-2 Cooler Line Plug into theradiator cooler.5. Install the DT-52263-4 Hose onto DT-52263-1Block Assembly install the DT-52263-4 onto theremoved transmission oil cooler line.6. Place the hose of the DT-52263-1 in theGE-47716-2 Graduated Measuring Bucket,utilizing a Spring Clamp to retain the hose.7. Raise the vehicle.9. Remove the level set plug (1) from thetransmission oil pan.372383951825418. Install the DT-45096-31 adapter (1) to theDT-51190 fluid fill adapter (2).Important: DO NOT overtighten the DT-51190 as itcan be damaged by excessive torque. Do notexceed 9 Y (80 lb in).10. Install the DT-51190/DT-45096-31 assembly andhand 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 OFFLUID AS IT COULD CAUSE FLUID PUMPCAVITATION AND POSSIBLY DAMAGE THETRANSMISSION.13. Utilizing the graduated bucket, start the engine andrun 30-45 seconds until 3 quarts of fluid isexpelled.
Page 12August, 201914. Shut the engine off immediately.15. Connect the DT-45096 to the vehicle battery12 volts and connect shop air to the air connection.Bulletin No.: 18-NA-35518. Switch the TransFlow DT-45096 to Flow and startthe engine:18.1. Add a maximum of 4 quarts of HP Fluid tothe transmission, turn the TransFlow switchto idle once 4 quarts have been added, whileallowing 4 additional quarts of oil to fill theDT-graduated cylinder (Reducing fluid levelin the TransFlow from 16–12).Note: DO NOT add additional transmission fluid untilthe 4 quarts of oil have been removed from thetransmission (Reducing fluid level in the TransFlowfrom 12–8).18.2. Repeat step 18.1.18.3. Add a maximum of 5 quarts of HP Fluid tothe transmission while allowing 5 additionalquarts of oil to fill the DT-graduated bucket(Reducing fluid level in the TransFlow from8–3).5181027Important: ADDING TOO MUCH FLUID TO THETRANSMISSION MAY CAUSE FLUID TO BEEXPELLED FROM THE VENT SYSTEM. DO NOTOVERFILL THE TRANSMISSION.16. Switch the DT-45096 TransFlow to Flow and add4 quarts of HP to the transmission.5181401518102017. Set the TransFlow switch to idle (Reducing fluidlevel in the TransFlow from 20–16).18.4. Shut the engine off once 16 quarts of oilhave been collected.18.5. Properly dispose of the collectedtransmission fluid.19. Remove the DT-52263-4 and DT-52263-1 BlockAdapter from the transmission oil cooler line.20. Remove the DT-52263-2 Cooler Line Plug from thetransmission oil cooler at the radiator and installthe transmission oil cooler line using a newretaining clip.
Bulletin No.: 18-NA-355August, 2019Page 1321. Install the engine upper air filter box back intoposition.22. Partially raise the vehicle.23. Start the engine.24. Using care, shift the transmission through allforward ranges and Reverse.25. Shift the transmission into Park.26. Perform the Transmission Fluid Level andCondition Check outlined below in this procedure:26.1. Get the transmission fluid temperature to theproper temperature.26.2. Raise the vehicle and remove the DT-51190/DT-45096-31 assembly.26.3. Install the level set plug.TightenTighten the plug to 9 Y (80 lb in).The TCC shudder condition should be directionalimproved immediately after the fluid exchangeprocedure. It may take up to 320 km (200 mi) for theTCC shudder condition to be eliminated. It is not arequirement for the dealer to drive the vehicle 320 km(200 mi). The customer should be advised that the fulleffect will take up to 320 km (200 mi) and a minimum oftwo cold to operating temperature drive cycles.Fluid Exchange Procedure - Camaro, CTS andATS Equipped with a Rear Differential CoolerImportant: This procedure must be followed aspublished. The exchange process is required to obtainproper level of new blue label Mobil 1 Synthetic LV ATFHP fluid. Intermixing of other types of transmission fluidor aftermarket additive packages will result in a lowconcentration level of new fluid and will not providesatisfactory results.1. Fill the DT-45096 with 20 quarts of HP fluid.2. Raise the vehicle on a hoist.51822453. Remove the lower/front transmission oil coolerline (2) at the rear differential.4. Install the DT-52263-2 Cooler Line Plug (1) into therear differential to prevent fluid loss.5. Install one end of the DT-52263-4 hose (4) to theopen port of the DT-52263-1 Block Assembly (3).6. Install the other end of the DT-52263-4 hose to thetransmission oil cooler line.7. Place the hose in the GE-47716-2 GraduatedMeasuring Bucket, utilizing a Spring Clamp toretain the hose.51825418. Install the DT-45096-31 adapter (1) to theDT-51190 fluid fill adapter (2).
Page 14August, 2019Bulletin No.: 18-NA-35514. Shut the engine off immediately.15. Connect the DT-45096 to the vehicle battery12 volts and connect shop air to the air connection.37238449. Remove the level set plug (1) from thetransmission oil pan.518102716. Switch the TransFlow DT-45096 to Flow and add4 quarts of HP to the transmission.17. Set the TransFlow switch to idle (Reducing fluidlevel in the TransFlow from 20–16).18. Switch the TransFlow DT-45096 to Flow and startthe engine:18.1. Add a maximum of 4 quarts of HP Fluid tothe transmission, turn the TransFlow switchto idle once 4 quarts have been added, whileallowing 4 additional quarts of oil to fill theDT-graduated bucket (Reducing fluid level inthe TransFlow from 16–12).Note: DO NOT add additional transmission fluid untilthe 4 quarts of oil have been removed from thetransmission (Reducing fluid level in the TransFlowfrom 12–8).3723839Important: DO NOT over tighten the DT-51190 as itcan be damaged by excessive torque. Do notexceed 9 Y (80 lb in).10. Install the DT-51190/DT-45096-31 assembly andhand 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 OFFLUID AS IT COULD CAUSE FLUID PUMPCAVITATION AND POSSIBLY DAMAGE THETRANSMISSION.13. Utilizing the graduated bucket, start the engine andrun 30-45 seconds until 3 quarts of fluid isexpelled.18.2. Repeat step 18.1.18.3. Add a maximum of 5 quarts of HP Fluid tothe transmission w
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
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