I'm getting an error message when I try to set up my 03 Duramax. It tells me unable to connect to vehicle. It gives me a retry option. This happens about 3 or 4 times then it says Error E 81 Contact Flashpaq. I unhooked the tuner and now my truck won't crank over at all. So I'm stuck 3 hours away from home and have to be back at work monday morn. It's saturday evening. Should I be calling the tow truck?