One problem related to transmission shudder has been reported for the 2017 Cadillac XTS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Cadillac XTS based on all problems reported for the 2017 XTS.
Xt5 has a transmission shudder, between 16mph and 50mph, with the aisin af50-8 transmission. Gm reports no problem with the aisin. Cadillac technician drove vehicle and did notice shudder. Next step, involve gm engineer. If he doesn't find an issue, I have to live with the shudder.