-15 degrees yesterday morning - turned the key and the 4x4 light came on and the Trans Fail Prog warning appeared. I turned it off waited a moment and started it again with no warning messages. Drove it slow for first few miles (no stationary warm-up) and noticed four flat spots on tires - nice ride! This thing hates the cold. '07 Hummer H3 and '99 Jeep Wrangler both started without issue and they are outside all night. Come on Spring!