[ChevyGuy]

Trunk release AND lights? Time to start following the wiring. I think something got unplugged. Or, replugged the wrong way.

 

[ChevyGuy]

I dug though my manual for my '13 and can't find any connectors in common with the trunk release and the brake/tail lights. The only thing in common is the BCM. But if that was bad, it would be odd that everything going wrong is in the back of the car.

Definitely check the fuses, but it would take more than one fuse to take out both rear brake lights.