After driving home last night in the rain/ice mix, i backed LaTundra up the driveway for the night. This morning after de-icing it and ready for an icey drive to work, i put it into drive and my 4x4 low light was blinking and the TRAC off light and check engine light was on. i thought it might be just be cold and wet and freezing thing but after rolling out of my driveway the truck WAS in fact in LOW gear I didn't use any 4 x 4 option last night. What could possibly cause this??? Surely Tundra drivers in the northern states could possibly have had this issue. LaTundra is 3yrs old and has giving me zero issues at this point. i put it back in the drive and started de-icing the wifey's vehicle to go to work. Could the ice buildup somewhere underneath somehow make the truck engage into 4 X 4 LOW ??? if so what percautionary measures should i take?