Hi, STORMY. Since we are not certified technicians, we are unable to speculate what could be causing the shudder in your XTS. If you are still experiencing issues, we recommend having the dealership take a more hands on approach to this concern. Our team would be happy to provide an additional layer of assistance and reach out to the dealer on your behalf. Should you like our help, please email
[email protected] with your contact information, VIN, mileage, preferred dealership. To learn more about GM’s privacy policy, please visit
https://www.gm.com/privacy-statement.html.
Cara F.
Cadillac Customer Care