There are a ton of articles about this on different forums and those of us who have owned our trucks for any amount of time have dealt with them multiple times. There is a potential for broken and/or corroded wires all over the truck, corroded connectors, etc. Google the fault code you're getting and see what comes up. What you're giving us is vague information and you have to understand this is a complex system that when working is unstoppable but does need attention occasionally. I have attached the basic overview so you can see what you're dealing with. And also remember all the systems on the truck communicate together and take signals from each other for operation so a steering sensor error can affect the transmission and a transmission error can affect the suspension. Let us know what you find.