CEL light came on: U0001

[bboxall]

This morning I started the truck up cold, backed out of the garage and drove 2 miles to Walmart. I was in the store for about 20+ minutes and had a several bags to unload into the rear floor board. I close the truck doors but don't lock them and begin to push the shopping cart toward the closest rack. When I get by the front bumper of my truck I decide to REMOTE START it with the fob so it can cool the interior. The truck starts normally then runs 5 seconds and then shuts down. I find this interesting so when I get back to the truck and get it it starts with the push button and then throws the CEL light on. I drive around for about 15 miles testing the truck and it all seems fine but the CEL is stil on. When I get home I plug my scanner in to it and the error is U0001 High Speed CAN Bus. I decide to erase the code, it clears and hasn't shown up again.