#Tsb 18 na 355 update#
GM does not want the expense of replacing the torque converters so very few are able to get this under warranty, and it is just the same design they replace it with, again NOT addressing the cause, only the symptoms. 18-NA-355 A8 Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH JanuTSB (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. ONLY a good proper designed aftermarket converter can correct the cause. The shudder is from the fluid aerating and then it cannot provide the clamping pressure for the clutches and steels, and the metal HCI2000SS found is from the damaged caused by the shudder, and all will have this damage depending on how long the shudder was present. The flush is only a bandaid intended to get you past the warranty period, and then it is no longer a liability to the auto maker. The symptom is from the stock converters poor design.
Now, on the shudder issue and the fluid flushes. It is their responsibility, but it does not make the dealer or the tech any additional compensation, so the "run around" is usually given. Techs are paid flat rate, so if there is a mistake they need to fix it with no pay for fixing it as they received pay for the first fix. I had the tranny fluid flushed at 16,000 miles and replace at dealership last month.ScatPack is correct. Mexico and Export Regions should follow Bulletin. Please note, the TSB covers Cadillac (ATS, CTS, CT6, Escalade), Chevrolet (Camaro, Colorado, Corvetee, Silverado), and GMC (Canyon, Sierra, Yukon), the production dates applicable are different for each model, I only referenced the Colorado and Canyon dates above.Įmulous74 wrote:The TSB #18-NA-355: Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed - (July 29, 2019) Service Bulletin Bulletin No.: 18-NA-355 Date: May, 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). Mobil 1 Synthetic LV ATF HP (Available only through Local GM Oil Distributors) These vehicles are already equipped with the latest HP fluid. If a customer presents a vehicle with a similar complaint, follow normal SI diagnostics.Diagnosis beyond the customer compliant is not required if vehicle was built prior to production dates indicated above.įor vehicles built after the production dates listed above. The condition may be described as if they are driving over rumble strips or a concrete road surface with rough expansion joints.Ĭause: This condition may be due to Torque Converter Clutch (TCC) Shudder.Ĭorrection: Vehicles that are presented with TCC shudder should have the appropriate fluid exchange procedure completed.Involved Region or Country: United States, Canada, Middle East Operations (MEO)Ĭondition: Some customers may comment that their vehicle is experiencing 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.
So your vehicle built after Madoes not apply to this TSB. The Date Break point (for the Chevy Colorado and GMC Canyon) is from 2017 SOP (Start of Production) to March 1, 2019. The TSB #18-NA-355: Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed - (July 29, 2019)
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