this morning the wife left the house and noticed that the 4x4 low light was flashing and was engaged. The truck has never been in 4wheel drive and the slector switch has never been turned. I limped the truck over to the dealership at 20mph,because it wouldn't go any faster than that. While i was sitting in the service drive the light started flashing 4wheel high. The truck only has 500 miles on it and all on the Hwy.:dunno: What would make the computer engage the 4wheel drive???