Update on fix. Today I resolved my no sound issue by pure luck on my 2015 Silverado. The issue was in the chevy mylink Bluetooth. Here is what I did to solve my issue. 1. Open Bluetooth on phone 2. Select chevy mylink 3. Select gear icon 4. Unselect HD Audio When I did this the sound worked. Couldn't believe it was something this simple but surprised me the most is the experts had no answer. Hopefully this works for those with no sound using the Pandora app installed on the vehicle.
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