Bulletin No.: 18-NA-161 October, 2019 Page 3 Correction 1 Important: The following steps must be completed in order. Grasping or attempting to rotate cables could affect readings and should be doneafter performing the voltage drop measurement. Note: When checking voltage drop, the voltage drop should be performed with the fuel BigTallVandy said: TSB's are simply guidance documents to assist service personnel in quickly diagnosing and repairing previously identified issues. They are not related to a vehicle's warranty. If a problem is addressed by a TSB and the vehicle is still under warranty, it is repaired free of charge to the owner.HenryT · #6 · Mar 1, 2019. Jazzman53 said: GM has stopped doing the torque converter replacements, cancelled the TSB you referenced, and replaced the TSB with #19-NA-355, which applies to 2017-2019 8 speeds. Latter-built 19's already have the new part number TC but some of the earlier build ones don't.Chevrolet TSB 18-NA-177. Some customers may comment on any of the following conditions: 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. A shudder feeling that may be described as driving over rumble strips or rough pavement.General Motors (GM) has been ordered to pay more than $100 million to classes of vehicle owners who argue the company sold vehicles with defective engines. A federal jury in California delivered the verdict against GM after less than one day of deliberation. It will benefit three classes of around 38,000 GM vehicle owners from California, North ...CAUSE Road test has shudder when the torque converter is applied. Command TCC on and shudder goes away. Checked fluid level and found condition is full and in good condition. Checked bulletins found #18-NA-355 said to flush and drain fluids in the transmission. CORRECTION Flush and drain fluids for transmission shake/shudder repair.mitch22 Discussion starter · Sep 20, 2020. Cadillac Dealership here in AZ is wanting to do a full transmission service, flush, change the filter and reflush the trans on my 2016 escalade. He said it'd be about 20qts of the new Mobil 1 oil, pan gasket and filter.The issue about the TCC shudder that many of us have experienced, and apparently carried over to a variety of GM models with the same trans assembly, seems to pretty accurately described in TSB #18-NA-355 (22 pages). I got the TSB number, because the dealer printed it in my service invoice (N/C, since I am under the powertrain warranty).Tl* the contact owns a 2016 chevrolet corvette. the contact stated that there was leakage of air on the front passenger side. after opening the convertible top, the front driver side had a leakage of air. the vehicle was taken to the dealer more than four times, but the vehicle could not be repaired. the manufacturer was notified several times ...Mar 29, 2023 · The TSB 18-NA-355 states that General Motors knew about the Transmission Shudder as early as 2015, but only created the TSB in August 2019, "and this shows that General Motors suppressed information and decided to send vehicles to consumers anyway. According to the TSB Cadillac, Camaro, and GMCPI1178F warns Service Technicians about premature ... Helpful websites. 18-NA-177 - RevBase - Chevrolet Bulletin RE: Procedure to confirm that shudder in Chevy Colorados and GMC Canyons is transmission related and if confirmed, directive to effect ...Mexico and Export Regions should follow Bulletin 19-NA-018. Note: This procedure should only be completed once per vehicle. Any vehicle that returns with suspect shudder should be diagnosed utilizing published diagnostics, GDS, PICO Scope or other diagnostic tools. Sometimes shudder is not caused by the torque converter clutch (TCC).If you do not get it done by then, you will have to pay for the repair yourself. Bottom Line: Free if you get the work done before the expiration date. Recalls. When cars come in for service, shops keep track of what the problems are and what customers are saying about their vehicles. When enough safety- or emissions-related problems have been ...The TSB 18-NA-355 states that General Motors knew about the Transmission Shudder as early as 2015, but only created the TSB in August 2019, "and this shows that General Motors suppressed information and decided to send vehicles to consumers anyway. According to the TSB Cadillac, Camaro, and GMCPI1178F warns Service Technicians about premature ...Jun 5, 2018 · Chevrolet TSB 18-NA-177. Some customers may comment on any of the following conditions: 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. A shudder feeling that may be described as driving over rumble strips or rough pavement. For further information and the fluid exchange procedure, refer to GM corporate Technical Service Bulletin (TSB) 18-NA-355, available in Service Information. The Kit includes: • DT-52263-1 Block Assembly (with 10 foot long fluid drain hose and spring clamp)18-NA-355 18-NA-355 Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed 1/17/2019 ATS Luxury ATS Premium Luxury ATS Premium Performance ATS-V CT6 Luxury CT6 Platinum CT6 Plug-In CT6 Premium Luxury CTS Luxury CTS Premium Luxury CTS Vsport CTS Vsport Premium CTS Vsport Premium Luxury CTS-VTechnical Bulletin - #18-NA-355 - Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed - (Mar 30, 2020) - For 2017 Cadillac CT6. This bulletin is found in the CT6 Service Manual (Europe, Korea, N America, Other IO). Technical Service Bulletins. Technical Service Bulletins (TSBs) are recommended steps and procedures for repairing vehicles. A TSB is issued by an automaker when there is a growing trend with an unanticipated problems. The Silverado 2500 has been assigned 4536 TSBs, the most of any Chevrolet vehicle.Shudder TSB 18-NA-355 has been updated 7/19. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done.Page 4 April, 2020 Bulletin No.: 18-NA-355 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 (16lbft). 7. Place the hose (3) in the GE-47716-2 GraduatedJan 17, 2019 · 18-NA-355 18-NA-355 Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed 1/17/2019 ATS Luxury ATS Premium Luxury ATS Premium Performance ATS-V CT6 Luxury CT6 Platinum CT6 Plug-In CT6 Premium Luxury CTS Luxury CTS Premium Luxury CTS Vsport CTS Vsport Premium CTS Vsport Premium Luxury CTS-V Sep 1, 2020 · #18-NA-355 is the procedure that fixed my shudder issue. It took me three trips to the Dealership, and a test drive by the Service Manager for them to perform the TSB. 2017 Colorado Z71 V6 4WD Crew Cab -Leer bed cap. The auto manufacturers had no legal obligation to repair the cars. Technical Service Bulletins are issued by manufacturers when there is a problem found in a number of cars which does not have an ...Feb 24, 2021 · This video is just a walk through of what you might be dealing with if you feel an unusual shudder.Subject: Shake and/or Shudder During Light Throttle Acce... Chevrolet TSB 18-NA-355 Make: Chevrolet Number: 18-NA-355 Title: Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed Date: 1/17/2019 Models: 2017-2019 Camaro LS; 2016-2019 Camaro LT; 2016-2019 Camaro SS; 2017-2019 Camaro ZL1; 2017-2019 Colorado; 2017-2019 Colorado LT; 2017-2019 ...Jan 9, 2012 · If you do not get it done by then, you will have to pay for the repair yourself. Bottom Line: Free if you get the work done before the expiration date. Recalls. When cars come in for service, shops keep track of what the problems are and what customers are saying about their vehicles. When enough safety- or emissions-related problems have been ... This video is just a walk through of what you might be dealing with if you feel an unusual shudder.Subject: Shake and/or Shudder During Light Throttle Acce...Norcalace · #17 · May 6, 2022. MrYgrmstr said: My car is at the dealer for the next several days to fix the dreaded A8 shudder and a flaky infotainment screen. Man I hope it all gets resolved. As the title states, fingers crossed 🤞🏻. There is a Service Bulletin that covers your issue. It’s Bulletin # 18-NA-355.Rudy's bundled a complete 8L90 Transmission service kit for your GM Truck and SUV. Keep your transmission operating at top notch with all the necessary filters and fluids! Service your transmission with the new updated transmission fluid per GM TSB 18-NA-355. All filters and gaskets are genuine ACDelco parts.Jan 17, 2019 · Chevrolet TSB 18-NA-355 Make: Chevrolet Number: 18-NA-355 Title: Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed Date: 1/17/2019 Models: 2017-2019 Camaro LS; 2016-2019 Camaro LT; 2016-2019 Camaro SS; 2017-2019 Camaro ZL1; 2017-2019 Colorado; 2017-2019 Colorado LT; 2017-2019 ... Rudy's bundled a complete 8L90 Transmission service kit for your GM Truck and SUV. Keep your transmission operating at top notch with all the necessary filters and fluids! Service your transmission with the new updated transmission fluid per GM TSB 18-NA-355. All filters and gaskets are genuine ACDelco parts.Technical Bulletin - #18-NA-355 - Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed - (Mar 30, 2020) - For 2017 Cadillac CT6. This bulletin is found in the CT6 Service Manual (Europe, Korea, N America, Other IO). Took to Chevy dealership in Dec. of 2019 (@30,000 mi.) to have TSB 18-NA-355 performed. The. Mobil 1 Synthetic LV ATF HP transmission fluid swap was successful until last week when I hit around 52,000 mi. and the same problems began to emerge.. Just took the truck back in for service today.Illinois. Oct 25, 2021. #16. AngryScientist said: 18 Chevy Colorado V6/8-sp trans. 29000 miles. Just developed the dreaded, well known shudder issue on light acceleration. There is a TSB out there to flush the trans with new Mobil 1 Synthetic LV ATF HP fluid; which allegedly corrects the issue in the torque converter clutch area if the wear is ...Bulletin No.: 18-NA-161 October, 2019 Page 3 Correction 1 Important: The following steps must be completed in order. Grasping or attempting to rotate cables could affect readings and should be doneafter performing the voltage drop measurement. Note: When checking voltage drop, the voltage drop should be performed with the fuelService 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).Shudder TSB 18-NA-355 has been updated 7/19 I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures.Sep 12, 2021 · According to the Technical Service Bulletin (TSB 18-NA-355), flushing factory-used transmission fluid and swapping it for Mobil 1 Synthetic LV ATF HP fluid may improve the situation. If there is no noticeable improvement after transmission fluid flush, the torque converter could be glazed, especially if it was used with this issue for a long time. TSB-NA-355 was reference on the paperwork. All is good for now Bill 2023 GMC Canyon Denali | 1-20 - 1100 ordered | 2-24 - 3800 Built | 4-27 - 6000 Delivered 2023 Chevy Camaro 2SS 1LE 2018 GMC Canyon Denali Crew Cab 4WD V6 (sold) 2015 GMC Canyon SLT Crew Cab 4WD (sold) 2004 Chevy Colorado Z71 Crew Cab 4WD (sold)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.Shudder TSB 18-NA-355 has been updated 7/19. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done.Apr 27, 2020 · Which revision of 18-NA-355 was followed and which fluid was used? It matters. Reply. steven says: May 5, 2020 at 6:42 am #16-NA-361 Document ID:4605342 The latest fluid was used. Reply. Oct 10, 2019 · TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. With that said I was able to get mine replaced with the fluid/flush. It's likely dealer dependant. In my case the dealer saw the metal shavings in the fluid from the torque converter clutches, so they told GM, and they said to go ahead and replace it Repeat steps 2 and 3, clean the transmission oil pan and magnet....." (3rd time the pan gets dropped) Version 1 dtd Jan 17, 2019: View attachment TSB # 18-NA-355 Part 1.pdf View attachment TSB # 18-NA-355 Part 2.pdf (this is the one with Corvette specific procedure, pg 25) TSB #18 NA 355 wasStarted experiencing the Transmission Shudder. GM refers to it as SERVICE BULLETIN 18-NA-355. Chevrolet Colorado 2017-2019. Condition: may be described as driving over low rumble strips or Highway with rough expansion joints. Cause: may be due to Torque Converter Clutch Shudder. Correction: Should have the appropriate fluid exchange procedure ...Which revision of 18-NA-355 was followed and which fluid was used? It matters. Reply. steven says: May 5, 2020 at 6:42 am #16-NA-361 Document ID:4605342 The latest fluid was used. Reply.BigTallVandy said: TSB's are simply guidance documents to assist service personnel in quickly diagnosing and repairing previously identified issues. They are not related to a vehicle's warranty. If a problem is addressed by a TSB and the vehicle is still under warranty, it is repaired free of charge to the owner.Discussion Starter · Jul 11, 2021. I've read about both some quick and painless service appointments, and some not so easy ones as well. I'll drop my truck off tomorrow for the initial diagnostic, which I already know is the infamous shudder/shake. I'd also like an RFB, alignment, tire rotation, and a new TC if they deem appropriate.Sep 18, 2019 · C7 General Discussion - LATEST TSB 18-NA-355 for AUTO TRANS SHUDDER - I found and attached the latest TSB 18-NA-355 regarding automatic transmission shudder. It was on the NHTSA website. The latest update is July 29, 2019. I also found another bulletin that applies, see attached TSB 19-NA-142 Sep 1, 2020 · #18-NA-355 is the procedure that fixed my shudder issue. It took me three trips to the Dealership, and a test drive by the Service Manager for them to perform the TSB. 2017 Colorado Z71 V6 4WD Crew Cab -Leer bed cap. Rudy's bundled a complete 8L90 Transmission service kit for your GM Truck and SUV. Keep your transmission operating at top notch with all the necessary filters and fluids! Service your transmission with the new updated transmission fluid per GM TSB 18-NA-355. All filters and gaskets are genuine ACDelco parts.Repeat steps 2 and 3, clean the transmission oil pan and magnet....." (3rd time the pan gets dropped) Version 1 dtd Jan 17, 2019: View attachment TSB # 18-NA-355 Part 1.pdf View attachment TSB # 18-NA-355 Part 2.pdf (this is the one with Corvette specific procedure, pg 25) TSB #18 NA 355 wasMar 16, 2021 · Started experiencing the Transmission Shudder. GM refers to it as SERVICE BULLETIN 18-NA-355. Chevrolet Colorado 2017-2019. Condition: may be described as driving over low rumble strips or Highway with rough expansion joints. Cause: may be due to Torque Converter Clutch Shudder. Correction: Should have the appropriate fluid exchange procedure ... Shudder TSB 18-NA-355 has been updated 7/19. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done.Dec 13, 2018 · I just took my vehicle into the dealership and they performed the testing required per TSB 18-NA-355. They could not get the pco-scop to register a high enough vibration so they would not warranty the repair. I believe this was because the last TSB 16-na-175 fixed most of the vibration and the small vibrations would not register per 18-na-355. Page 2 March, 2019 Bulletin No.: 18-NA-355 Shudder Test Refer to the table below for conditions pertaining to specific applications. In each vehicle, constant throttle input on a smooth grade is desirable. PicoScope Measured Frequency is the approximate vibration frequency where TCC Shudder can be found, discussed in detail below.Mexico and Export Regions should follow Bulletin 19-NA-018. Note: This procedure should only be completed once per vehicle. Any vehicle that returns with suspect shudder should be diagnosed utilizing published diagnostics, GDS, PICO Scope or other diagnostic tools. Sometimes shudder is not caused by the torque converter clutch (TCC).Title: #18-NA-355 - Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed - (Mar 30, 2020) Vehicle: 2016 Chevrolet Silverado - 4WD The document preview is shown on the right. To view the entire document you need to have a subscription. Subscribe Apr 13, 2020 · Took to Chevy dealership in Dec. of 2019 (@30,000 mi.) to have TSB 18-NA-355 performed. The. Mobil 1 Synthetic LV ATF HP transmission fluid swap was successful until last week when I hit around 52,000 mi. and the same problems began to emerge.. Just took the truck back in for service today. 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: Jan 9, 2012 · If you do not get it done by then, you will have to pay for the repair yourself. Bottom Line: Free if you get the work done before the expiration date. Recalls. When cars come in for service, shops keep track of what the problems are and what customers are saying about their vehicles. When enough safety- or emissions-related problems have been ... Jul 29, 2019 · Shudder TSB 18-NA-355 has been updated 7/19. 96258 Views 354 Replies 83 Participants Last post by DieselDrax , Sep 26, 2022 Jump to Latest. B. BevyofChevys Discussion starter · Jul 29, 2019. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require ... Bulletin No.: 18-NA-355 April, 2020 Page 3 4733125 • DT-45096-31 TransFlow Adapter (one of two pieces from DT-45096-30) 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 toService 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).My car was due for an oil change so I thought I would get the Thunk taken care of. I went in armed with the TSB #18-NA-355 dealing with the triple flush of fluids. However, the Corvette Tech specialist at the dealer said he would perform a complete diagnostic test before considering the TSB.Apr 13, 2022 · Norcalace · #17 · May 6, 2022. MrYgrmstr said: My car is at the dealer for the next several days to fix the dreaded A8 shudder and a flaky infotainment screen. Man I hope it all gets resolved. As the title states, fingers crossed 🤞🏻. There is a Service Bulletin that covers your issue. It’s Bulletin # 18-NA-355. Apr 13, 2020 · TSB 18-NA-355 was updated July 2019 negating the need for the picoscope diagnosis (see the bottom section in your link), and dealerships were directed to flush their existing stock. Both versions of 18-NA-355 used the same exact Mobil 1 fluid (or the TSB would have had a different number), which my dealership began using Jan 2019. Posts: 23. TSB 18-NA-355 - After effects. Just recently had the 18-NA-355 service bulletin for my 17 SS A8 and noticing the transmission is acting much better but slightly different? The shudder is gone completely which is awesome but i am noticing the RPMs are idling a bit higher around 1800-2000 rpm in 8th at 65-70 vs 1500ish prior to the TSB.If TCC shudder is present, a vibration peak will appear within +/- 2 Hz of the frequency listed in Bulletin #18-NA-355. Refer to the bulletin for additional information, including required shudder test conditions for each vehicle being diagnosed as well as the fluid exchange procedures. Fig. 11 Fluid ExchangeHad New TSB #18-NA-355 (A8 Shudder) Done. FYI, if paying out of pocket for this it is 3 hours of labor versus the 1.6 in the bulletin. It took every bit of those 3 hours. I watched. GM evidently doesn’t reimburse dealers for full labor time on warranty work; hence the 1.6 hrs in the bulletin vs 3 if paying out of pocket.Mar 29, 2023 · The TSB 18-NA-355 states that General Motors knew about the Transmission Shudder as early as 2015, but only created the TSB in August 2019, "and this shows that General Motors suppressed information and decided to send vehicles to consumers anyway. According to the TSB Cadillac, Camaro, and GMCPI1178F warns Service Technicians about premature ... Cost to replace the torque converter in a Camaro SS with the 8-speed automatic transmission. It was replaced due to the shudder as per TSB 18-NA-355💠My Inst...TSB 18-NA-355 was updated July 2019 negating the need for the picoscope diagnosis (see the bottom section in your link), and dealerships were directed to flush their existing stock. Both versions of 18-NA-355 used the same exact Mobil 1 fluid (or the TSB would have had a different number), which my dealership began using Jan 2019.18-NA-355 TSB (Technical Service Bulletin) which I think is for the transmission fluid flush, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 ” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Affected vehicles include Chevrolet, GMC and Cadillac vehicles, as follows.This problem currently affects 11 different models across 3 different OEM brands for the model years between 2015 and 2019. After implementing several fluid revisions, GM’s latest solution (TSB 18-NA-355) is lengthy, complicated and expensive. ItFeb 20, 2019 · In fact, 16-NA-175 refers readers to 18-NA-355 for service instructions. 18-NA-355 lists the PN for Mobil 1 Synthetic LV ATF HP as 19417577 for quart containers and 19417904 for 55-gal. drums but, as you stated above, both numbers are incorrect. The correct PN for the quart containers is 19353429. Mar 29, 2023 · The TSB 18-NA-355 states that General Motors knew about the Transmission Shudder as early as 2015, but only created the TSB in August 2019, "and this shows that General Motors suppressed information and decided to send vehicles to consumers anyway. According to the TSB Cadillac, Camaro, and GMCPI1178F warns Service Technicians about premature ... Page 2 March, 2019 Bulletin No.: 18-NA-355 Shudder Test Refer to the table below for conditions pertaining to specific applications. In each vehicle, constant throttle input on a smooth grade is desirable. PicoScope Measured Frequency is the approximate vibration frequency where TCC Shudder can be found, discussed in detail below.Page 2 March, 2019 Bulletin No.: 18-NA-355 Shudder Test Refer to the table below for conditions pertaining to specific applications. In each vehicle, constant throttle input on a smooth grade is desirable. PicoScope Measured Frequency is the approximate vibration frequency where TCC Shudder can be found, discussed in detail below.I just took my vehicle into the dealership and they performed the testing required per TSB 18-NA-355. They could not get the pco-scop to register a high enough vibration so they would not warranty the repair. I believe this was because the last TSB 16-na-175 fixed most of the vibration and the small vibrations would not register per 18-na-355.C7 General Discussion - LATEST TSB 18-NA-355 for AUTO TRANS SHUDDER - I found and attached the latest TSB 18-NA-355 regarding automatic transmission shudder. It was on the NHTSA website. The latest update is July 29, 2019. I also found another bulletin that applies, see attached TSB 19-NA-142Oct 10, 2019 · TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. With that said I was able to get mine replaced with the fluid/flush. It's likely dealer dependant. In my case the dealer saw the metal shavings in the fluid from the torque converter clutches, so they told GM, and they said to go ahead and replace it Drives: 2018 2SS. Join Date: Aug 2017. Location: Western PA. Posts: 133. July Update #18-NA-355. Anyone have a copy or link to the most recent shudder TSB? Looks like no diagnosis required if built before March 2019 based on the July update. Only customer complaint needed for dealers to perform the flush. I think I may have the start of the ...Apr 13, 2020 · Took to Chevy dealership in Dec. of 2019 (@30,000 mi.) to have TSB 18-NA-355 performed. The. Mobil 1 Synthetic LV ATF HP transmission fluid swap was successful until last week when I hit around 52,000 mi. and the same problems began to emerge.. Just took the truck back in for service today. Aug 14, 2019 · As of August 7th, GM dealers should also be flushing all potentially affected new vehicles on the lot. According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Dec 13, 2018 · Hi John. My local GM dealer recently (1/24/19) diagnosed my 2016 Camaro SS with the same code as your Corvette (18-NA-355). I google searched it and found your post. They flushed and changed my transmission oil (13K miles) and the shudder has greatly improved. However, I am noticing some new hesitations as the transmission shifts in lower gears. Page 4 April, 2020 Bulletin No.: 18-NA-355 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 (16lbft). 7. Place the hose (3) in the GE-47716-2 Graduated18-NA-355 TSB (Technical Service Bulletin) which I think is for the transmission fluid flush, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 ” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Affected vehicles include Chevrolet, GMC and Cadillac vehicles, as follows.Shudder TSB 18-NA-355 has been updated 7/19 I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures.Jan 4, 2022 · They were not willing to admit that this is a widespread problem. I showed them the TSB 18-NA-355 that describes the problem. They said a new TSB was released in 2022, TSB 16-NA-361, where it states that this is normal operation and replacing any transmission components will not resolve the problem. 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I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done.. Hbo max can
rust oleum tub tile refinishing kit storesSep 18, 2019 · C7 General Discussion - LATEST TSB 18-NA-355 for AUTO TRANS SHUDDER - I found and attached the latest TSB 18-NA-355 regarding automatic transmission shudder. It was on the NHTSA website. The latest update is July 29, 2019. I also found another bulletin that applies, see attached TSB 19-NA-142 Noticed the shudder at just under 1200 miles, Dec '18, purchased car new 2/18. Had oil change and 18-na-355 done 2/19 at about 1400 miles. 5575 miles now, still no shudder. Shifts perfectly, quick, crisp.Page 4 April, 2020 Bulletin No.: 18-NA-355 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 (16lbft). 7. Place the hose (3) in the GE-47716-2 GraduatedI just took my vehicle into the dealership and they performed the testing required per TSB 18-NA-355. They could not get the pco-scop to register a high enough vibration so they would not warranty the repair. I believe this was because the last TSB 16-na-175 fixed most of the vibration and the small vibrations would not register per 18-na-355.Shudder TSB 18-NA-355 has been updated 7/19. 96258 Views 354 Replies 83 Participants Last post by DieselDrax , Sep 26, 2022 Jump to Latest. B. BevyofChevys Discussion starter · Jul 29, 2019. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require ...Illinois. Oct 25, 2021. #16. AngryScientist said: 18 Chevy Colorado V6/8-sp trans. 29000 miles. Just developed the dreaded, well known shudder issue on light acceleration. There is a TSB out there to flush the trans with new Mobil 1 Synthetic LV ATF HP fluid; which allegedly corrects the issue in the torque converter clutch area if the wear is ...The issue about the TCC shudder that many of us have experienced, and apparently carried over to a variety of GM models with the same trans assembly, seems to pretty accurately described in TSB #18-NA-355 (22 pages). I got the TSB number, because the dealer printed it in my service invoice (N/C, since I am under the powertrain warranty).Transmission flush fixed the shudder. (Tsb 18-NA-355) Took my 2018 Colorado WT in for the flush at the Chevy service center I get all my routine work done at. It was all covered under warranty as I only have 18,900 miles on it. Glad the flush fixed the issue. Runs smooth now, and the shifting is like night and day. The whole process took about ... Took to Chevy dealership in Dec. of 2019 (@30,000 mi.) to have TSB 18-NA-355 performed. The. Mobil 1 Synthetic LV ATF HP transmission fluid swap was successful until last week when I hit around 52,000 mi. and the same problems began to emerge.. Just took the truck back in for service today.Page 4 April, 2020 Bulletin No.: 18-NA-355 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 (16lbft). 7. Place the hose (3) in the GE-47716-2 Graduated18-NA-355 TSB (Technical Service Bulletin) which I think is for the transmission fluid flush, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 ” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Affected vehicles include Chevrolet, GMC and Cadillac vehicles, as follows.18-NA-355 TSB (Technical Service Bulletin) which I think is for the transmission fluid flush, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 ” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Affected vehicles include Chevrolet, GMC and Cadillac vehicles, as follows.If I am reading the 18-NA-355 that you posted for the c-7 corvette right, it looks likes if your corvette was made AFTER Feb. 1st of 2019 you should have the new fluid in it ? Yes, that's correct. Also 18-NA-355 TBS I posted is the latest version dated April 2020 which replaced the August 2019 version that was also posted above.Apr 21, 2023 · This problem currently affects 11 different models across 3 different OEM brands for the model years between 2015 and 2019. After implementing several fluid revisions, GM’s latest solution (TSB 18-NA-355) is lengthy, complicated and expensive. It Apr 27, 2021 · C7 General Discussion - 18-NA-355 Shudder - Does Service Bulletin 18-NA-355 cover all 2017 model year Corvettes built before 2/1/19? Or does it only cover certain VIN’s? (M5U trans) Both my dealer and the Chevy customer assistance phone line say my vehicle is not covered because of my VIN. June 27, 2022 Sponsored by Lubegard General Motors has published multiple technical service bulletins pertaining to torque converter clutch shudder issues in their 8-speed transmissions. This problem currently affects 11 different models across 3 different OEM brands for the model years between 2015 and 2019.For example, the GM service bulletin 18-NA-355 for the 8-speed 8L90 transmission recommends flushing the transmission to fix 'Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH'. If you have the 6-speed transmission check if the TSB 21-NA-199 has been done to your truck, as it helps to keep the transmission cooler.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: May 6, 2022 · The issue about the TCC shudder that many of us have experienced, and apparently carried over to a variety of GM models with the same trans assembly, seems to pretty accurately described in TSB #18-NA-355 (22 pages). I got the TSB number, because the dealer printed it in my service invoice (N/C, since I am under the powertrain warranty). Jul 29, 2019 · TSB-NA-355 was reference on the paperwork. All is good for now Bill 2023 GMC Canyon Denali | 1-20 - 1100 ordered | 2-24 - 3800 Built | 4-27 - 6000 Delivered 2023 Chevy Camaro 2SS 1LE 2018 GMC Canyon Denali Crew Cab 4WD V6 (sold) 2015 GMC Canyon SLT Crew Cab 4WD (sold) 2004 Chevy Colorado Z71 Crew Cab 4WD (sold) TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. With that said I was able to get mine replaced with the fluid/flush. It's likely dealer dependant. In my case the dealer saw the metal shavings in the fluid from the torque converter clutches, so they told GM, and they said to go ahead and replace itRepeat steps 2 and 3, clean the transmission oil pan and magnet....." (3rd time the pan gets dropped) Version 1 dtd Jan 17, 2019: View attachment TSB # 18-NA-355 Part 1.pdf View attachment TSB # 18-NA-355 Part 2.pdf (this is the one with Corvette specific procedure, pg 25) TSB #18 NA 355 wasJan 17, 2019 · 18-NA-355 18-NA-355 Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed 1/17/2019 ATS Luxury ATS Premium Luxury ATS Premium Performance ATS-V CT6 Luxury CT6 Platinum CT6 Plug-In CT6 Premium Luxury CTS Luxury CTS Premium Luxury CTS Vsport CTS Vsport Premium CTS Vsport Premium Luxury CTS-V According to the Technical Service Bulletin (TSB 18-NA-355), flushing factory-used transmission fluid and swapping it for Mobil 1 Synthetic LV ATF HP fluid may improve the situation. If there is no noticeable improvement after transmission fluid flush, the torque converter could be glazed, especially if it was used with this issue for a long time.Shudder TSB 18-NA-355 has been updated 7/19. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done.The GM 8L45 eight-speed automatic transmission. According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and ...Dec 13, 2018 · 18-NA-355 and 19-NA-121 have been updated effective July 9, 2019 to eliminate the diagnostics portion within the TSB's and the labor times have been updated to reflect the removal of the diagnostic procedures. Vehicles presented with suspected shudder within the published build dates should have the prescribed fluid exchange procedure performed. Oct 10, 2019 · TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. With that said I was able to get mine replaced with the fluid/flush. It's likely dealer dependant. In my case the dealer saw the metal shavings in the fluid from the torque converter clutches, so they told GM, and they said to go ahead and replace it Technical Service Bulletins. Technical Service Bulletins (TSBs) are recommended steps and procedures for repairing vehicles. A TSB is issued by an automaker when there is a growing trend with an unanticipated problems. The Silverado 2500 has been assigned 4536 TSBs, the most of any Chevrolet vehicle.Had New TSB #18-NA-355 (A8 Shudder) Done. FYI, if paying out of pocket for this it is 3 hours of labor versus the 1.6 in the bulletin. It took every bit of those 3 hours. I watched. GM evidently doesn’t reimburse dealers for full labor time on warranty work; hence the 1.6 hrs in the bulletin vs 3 if paying out of pocket.Service Procedure outlined in TSB 18-NA-355 for all models except the 2019 Chevrolet Silverado 1500 and GMC Sierra 1500 (New Body Style). For the 2019 Chevrolet Silverado 1500 and GMC Sierra 1500 (New Body Style), refer to bulletin 19-NA-121.TSB 18-NA-355. Note: Required tool kit DT-52263 is shipping from Bosch. All DT-52263 tool kits will ship from Bosch no later than February 14, 2019. If you encounter a vehicle with Torque Converter Clutch (TCC) Shudder prior to receiving tool kit DT-52263 please postpone the repair until you receive your tool kit. Performing repairs other The Technical Service Bulletin (TSB) #17-01-046 for this recall was published on June 3, 2017.2 Refer to . Hyundaitechinfo.com for the latest TSB.Started experiencing the Transmission Shudder. GM refers to it as SERVICE BULLETIN 18-NA-355. Chevrolet Colorado 2017-2019. Condition: may be described as driving over low rumble strips or Highway with rough expansion joints. Cause: may be due to Torque Converter Clutch Shudder. Correction: Should have the appropriate fluid exchange procedure ...For example, the GM service bulletin 18-NA-355 for the 8-speed 8L90 transmission recommends flushing the transmission to fix 'Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH'. If you have the 6-speed transmission check if the TSB 21-NA-199 has been done to your truck, as it helps to keep the transmission cooler.Page 2 March, 2019 Bulletin No.: 18-NA-355 Shudder Test Refer to the table below for conditions pertaining to specific applications. In each vehicle, constant throttle input on a smooth grade is desirable. PicoScope Measured Frequency is the approximate vibration frequency where TCC Shudder can be found, discussed in detail below. 18-NA-355 18-NA-355 Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed 1/17/2019 ATS Luxury ATS Premium Luxury ATS Premium Performance ATS-V CT6 Luxury CT6 Platinum CT6 Plug-In CT6 Premium Luxury CTS Luxury CTS Premium Luxury CTS Vsport CTS Vsport Premium CTS Vsport Premium Luxury CTS-VIllinois. Oct 25, 2021. #16. AngryScientist said: 18 Chevy Colorado V6/8-sp trans. 29000 miles. Just developed the dreaded, well known shudder issue on light acceleration. There is a TSB out there to flush the trans with new Mobil 1 Synthetic LV ATF HP fluid; which allegedly corrects the issue in the torque converter clutch area if the wear is ...May 6, 2022 · The issue about the TCC shudder that many of us have experienced, and apparently carried over to a variety of GM models with the same trans assembly, seems to pretty accurately described in TSB #18-NA-355 (22 pages). I got the TSB number, because the dealer printed it in my service invoice (N/C, since I am under the powertrain warranty). I just took my vehicle into the dealership and they performed the testing required per TSB 18-NA-355. They could not get the pco-scop to register a high enough vibration so they would not warranty the repair. I believe this was because the last TSB 16-na-175 fixed most of the vibration and the small vibrations would not register per 18-na-355.Jun 18, 2019 · Here is the tsb Bulletin #18-NA-355. Yes for both 8 speeds with shudder. The complains have declined much since this came out. There have been a few that it did not work for but they may have had ... Torque converter clutch shudder issue per TSB# 18-NA-355 (July/8/2019) Doc ID: 5181942 replaces TSB 16-NA-175 & 18-NA-177 Learning Center Course 10218.12V All gave some, some gave all, protesters gave nothing.Jul 28, 2019 · Evidently that one and 18-NA-355 have just been updated with the new information and keep their #s. 2017 GMC Canyon Denali V6 CCSB 4X4 [/QUOTE The TBS # on the work order for my 2019 Colorado was 18-NA-355. 20 qts triple flush 7/29/2019 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.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.Jul 29, 2019 · TSB-NA-355 was reference on the paperwork. All is good for now Bill 2023 GMC Canyon Denali | 1-20 - 1100 ordered | 2-24 - 3800 Built | 4-27 - 6000 Delivered 2023 Chevy Camaro 2SS 1LE 2018 GMC Canyon Denali Crew Cab 4WD V6 (sold) 2015 GMC Canyon SLT Crew Cab 4WD (sold) 2004 Chevy Colorado Z71 Crew Cab 4WD (sold) Sep 6, 2019 · My car was due for an oil change so I thought I would get the Thunk taken care of. I went in armed with the TSB #18-NA-355 dealing with the triple flush of fluids. However, the Corvette Tech specialist at the dealer said he would perform a complete diagnostic test before considering the TSB. Oct 10, 2019 · TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. With that said I was able to get mine replaced with the fluid/flush. It's likely dealer dependant. In my case the dealer saw the metal shavings in the fluid from the torque converter clutches, so they told GM, and they said to go ahead and replace it The GM technical service bulletin (TSB) is 18-NA-355 for this procedure effecting 8-speed Colorado and Canyon trucks from SOP {Start Of Production} in 2017, through March 1, 2019 for trucks with a S or T as the 5th digit of the VIN.Jul 29, 2019 · Shudder TSB 18-NA-355 has been updated 7/19. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done. Jun 23, 2017 · Additionally, Hyundai increased the warranty for the engine “short block” (cylinder block, crankshaft, pistons, and connecting rods) to 10 years/120,000 miles for both original and subsequent owners of 2011 and 2012 Sonatas manufactured at Hyundai Aug 5, 2019 · Shudder TSB 18-NA-355 has been updated 7/19 I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. 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:Took to Chevy dealership in Dec. of 2019 (@30,000 mi.) to have TSB 18-NA-355 performed. The. Mobil 1 Synthetic LV ATF HP transmission fluid swap was successful until last week when I hit around 52,000 mi. and the same problems began to emerge.. Just took the truck back in for service today.Apr 13, 2020 · Has the TSB 18-NA-355 Transmission Fluid Exchange fix your transmission shutter issues. We've linked to so many versions of TSBs it's easy to be looking at one when you think it's the other. I believe the one dated August 2019 is the most recent, with the last revisions in July, unless someone has found one that's even more recent. 18-NA-355 and 19-NA-121 have been updated effective July 9, 2019 to eliminate the diagnostics portion within the TSB's and the labor times have been updated to reflect the removal of the diagnostic procedures. Vehicles presented with suspected shudder within the published build dates should have the prescribed fluid exchange procedure performed.Aug 5, 2019 · Shudder TSB 18-NA-355 has been updated 7/19 I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. Oct 4, 2017 · TSB 18-NA-355. Note: Required tool kit DT-52263 is shipping from Bosch. All DT-52263 tool kits will ship from Bosch no later than February 14, 2019. If you encounter a vehicle with Torque Converter Clutch (TCC) Shudder prior to receiving tool kit DT-52263 please postpone the repair until you receive your tool kit. Performing repairs other Aug 14, 2019 · As of August 7th, GM dealers should also be flushing all potentially affected new vehicles on the lot. According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. I've read 18-NA-177 and the older 16-NA-175 and now have found that an updated version of 16-NA-175 has this cryptic advice: Important: Do NOT replace the torque converter or transmission assembly for this condition. Engineer reviews have proven that replacing the torque converter does not provide a long-term solution to TCC shudder. Transmission flush fixed the shudder. (Tsb 18-NA-355) Took my 2018 Colorado WT in for the flush at the Chevy service center I get all my routine work done at. It was all covered under warranty as I only have 18,900 miles on it. Glad the flush fixed the issue. Runs smooth now, and the shifting is like night and day. The whole process took about ... 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.Drives: 2018 2SS. Join Date: Aug 2017. Location: Western PA. Posts: 133. July Update #18-NA-355. Anyone have a copy or link to the most recent shudder TSB? Looks like no diagnosis required if built before March 2019 based on the July update. Only customer complaint needed for dealers to perform the flush. I think I may have the start of the ... Feb 24, 2021 · This video is just a walk through of what you might be dealing with if you feel an unusual shudder.Subject: Shake and/or Shudder During Light Throttle Acce... Apr 13, 2020 · Has the TSB 18-NA-355 Transmission Fluid Exchange fix your transmission shutter issues. We've linked to so many versions of TSBs it's easy to be looking at one when you think it's the other. I believe the one dated August 2019 is the most recent, with the last revisions in July, unless someone has found one that's even more recent. Apr 13, 2020 · TSB 18-NA-355 was updated July 2019 negating the need for the picoscope diagnosis (see the bottom section in your link), and dealerships were directed to flush their existing stock. Both versions of 18-NA-355 used the same exact Mobil 1 fluid (or the TSB would have had a different number), which my dealership began using Jan 2019. Jul 29, 2019 · Shudder TSB 18-NA-355 has been updated 7/19. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require diagnostic procedures. This is obviously big news for those of us who have had to jump through dealer hoops to get anything done. Shudder TSB 18-NA-355 has been updated 7/19. 96258 Views 354 Replies 83 Participants Last post by DieselDrax , Sep 26, 2022 Jump to Latest. B. BevyofChevys Discussion starter · Jul 29, 2019. I just caught wind of a very important update to the transmission shudder TSB. Apparently, as of July 9th, the TSB has been revised to no longer require ...It's also possible you will have some warranty left on the 2018. If it was a certified pre-owned, the powertrain warranty covers transmission/TC for 6 years 100k miles, otherwise I think the 2018 was 5 years 60k miles. I would personally get the '18 with zero hesitation. Just make sure you insist on them doing the flush per TSB 18-NA-355.BigTallVandy said: TSB's are simply guidance documents to assist service personnel in quickly diagnosing and repairing previously identified issues. They are not related to a vehicle's warranty. If a problem is addressed by a TSB and the vehicle is still under warranty, it is repaired free of charge to the owner.In January 2019, GM issued TSB 18-NA-355 entitled, “Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed.”Had New TSB #18-NA-355 (A8 Shudder) Done. FYI, if paying out of pocket for this it is 3 hours of labor versus the 1.6 in the bulletin. It took every bit of those 3 hours. I watched. GM evidently doesn’t reimburse dealers for full labor time on warranty work; hence the 1.6 hrs in the bulletin vs 3 if paying out of pocket.18-NA-355 18-NA-355 Shake And/Or Shudder During Light Throttle Acceleration Between 25 And 80 Mph (40 And 128 Km/H) At Steady Speed 1/17/2019 ATS Luxury ATS Premium Luxury ATS Premium Performance ATS-V CT6 Luxury CT6 Platinum CT6 Plug-In CT6 Premium Luxury CTS Luxury CTS Premium Luxury CTS Vsport CTS Vsport Premium CTS Vsport Premium Luxury CTS-VThe issue about the TCC shudder that many of us have experienced, and apparently carried over to a variety of GM models with the same trans assembly, seems to pretty accurately described in TSB #18-NA-355 (22 pages). I got the TSB number, because the dealer printed it in my service invoice (N/C, since I am under the powertrain warranty).. 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