The issue affects 2017and 2017-2018 , and models. It stems from an improperly sized steering shaft bore hole that can eventually allow the separation of the steering universal joint, which would make it impossible to steer the vehicle. There's no record of any crashes associated with the defect.
This issue affects just 4,992 vehicles. The fix involves replacing the steering shaft in its entirety and will be performed (like all recalls) free of charge. Mercedes expects to start notifying owners of affected vehicles soon, with recall work set to begin on May 31.
If you own one of the affected models, you can call Mercedes' customer service line for more information at 1-800-367-6372.