Problem Description and Possible Solution
Lack of audio or cell phone functionality may be related to the failure of the audio gateway module.
Problem DataRepairPal Verified
Average mileage: 7,600 (7,600–7,600)
5 people reported this problem
Audio (Radio, Phone, CD) intermittently goes silent. All software updated on auto and still recurs. Dealership says it needs input from Mercedes and that is where it stands. I am going to suggest that it try to replace gateway module based on these reports.