P0513 invaild skim
what is it
looked cant find it

 

Your ECM isn't agreeing with your key fob. Mine does it to, but you can have it reprogrammed by the dealer, but it's no big deal. Truck will still run.

 

There is no need to worry about that code. 9 out of 10 vehicles that come in the shop have that code. as long as ur truck starts i wouldnt worry about it. If ur vehicle doesnt start some of the time there is a TSB to replaced the WCM (wireless control modual) with an updated part.