Occasionally I get a check engine light. When I use the EFI Live V2 scanner to check the code I get nothing. I can clear the code and clear any problems but would like to know what the problem is. Any help would be appreciated. The check engine light usually comes on when I'm out and about. I don't haul my laptop around everywhere so I hope I don't have to have it hooked up to check the code. I don't need it to clear the code. The other day I started out and felt the truck stagger and the check engine light came on. When it did I lost power above 1/4 throttle. I had to pull over and attempt to check the code. No luck but I was able to clear the code and the truck ran fine after that. I am wondering if their is a problem with my V2. It has never been able to read a code.