'transmission problems? Can't identify source of engine noise

Hello, I work with Honda's daily, and I can't determine what a 2015 Pilot could do that would create the scenario you are speaking of. I would recommend seeing either a Honda dealership or trusted repair facility near you to have a technician road test the vehicle with you and give you some real time feedback as to what you may be experiencing, and further, what should be done to resolve the concern.