4WD service light
 

I have an 07 6.7 3500 and it is not going into 4wd when i want it to. and it is going into 4wd when i dont want it to. the 4wd service light come on and off there is no rhyme or reason. the actuator clicks in and out when the truck is off and parked. like ill get back from town and unloading groceries and can hear it kicking in and out no keys in it and nothing turned on.