The transmission drive selector module may fail resulting in the loss of gear selection capability. In most cases this condition will leave the vehicle stranded and require replacement of the drive selector module.Google+
Car Problem Reports
Mercedes-Benz CL63 AMG The Transmission Drive Selector Module May Fail
Mercedes-Benz CL63 AMG Problem
Visitor, 2014 Mercedes-Benz CL63 AMG
Transmission section faiulre. cannot select a gear unless engine is turned off and then restarted. Needs a new transmission selector module. Thank God it is under warranty. This happened after my AC compressor went bad and was replaced... so much for a new car.