One problem related to battery dead has been reported for the 2015 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Chevrolet Impala based on all problems reported for the 2015 Impala.
Service side detection sensors. I own a chevy cruse,chevy Impala,and a GMC acadia and all 3 of these cars have the same problem. Water,salt and dirt get inside of these sensors and they short out. On the Impala they shorted out and I could not start the car the next day. The battery died. Went to the dealership and they disconnected them till the parts came in. Still waiting for the parts. I was told that this will only happen again there is no permanent fix. This is a $1400 repair. Not happy!.