Hello, I have a 03 f150 4.6L. When my key is in the on position I hear an electrical hum coming from under the truck. I used an audio inductive amplifier to trace the humming to the white wiring harness in the center of the picture. It is located on the back of the transmission on the passenger side. Can someone tell me if this is a sensor or a solenoid? If it's a solenoid which one? My truck seems to be operating fine, but my experiences with electrical components tell me that there may be a future problem with this. Any advice will be greatly appreciated.