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The majority of affected vehicles are from the 2015 and 2016 model years. However, all C7's with the A8, 8L90 transmission built through January of 2019 are subject to the TC "shudder" problem. Vehicles built from February, 2019 have the latest Mobil 1 ATF and the updated transmission components. 2014 models are not affected as they are fitted with the A6, 6L80 transmission.