We got a lot of snow and the service all wheel drive light came on I pulled over and now it’s off but there is the weird hum that only happens at a steady rate if you accelerate it goes away just as soon as your at a steady speed it comes back I have taken it to the dealership to get a peace of mind inspection and they came back with saying they don’t know what it is they think it’s the transmission and wanna look more into it after a couple hours they still didn’t know anything they said the inspection came back fine but could it be a hum caused by something to do with the all wheel drive system when driving shifts perfect and nothing makes me believe it’s the transmission