I went to visit my sister in the hospital and my caravan worked fine and now I went out in the freezing cold to start it and it won't go. I changed the battery in the remote and the battery in the car and now it won't start at all. Could this be because of the cold?

 

Most likely problem is the (WIN) wireless ignition module. Does the cluster show bad key or does the windows go down or the radio comes on? If none these work, then the problem is the win module. You would need the dealer for this problem.