Just picked up our 19 Redline from the dealership. Had the snow tires done as well as the shudder checked. Road test confirmed the issue. TCM update as well as fluid flush as per bulletin 18-NA-091. There was also another code on the invoice.
Mileage at service is 36618 Kilometres. Hopefully this is all that is needed. I will update if it returns.
2013 Traverse LT (traded)<br />2014 Traverse LT<br />2016 Traverse LT AWD, 2019 Traverse Red Line