I read on one of the forums that when Hypertech was doing the testing, a "hidden code" would form. You could find it and clear it, but it wouldn't automatically clear with the other codes. I'm pretty interested in this as well.

 

You bet they can see it! They can see how long and what HP the truck has ran out of stock settings as well. They can see any and everything that has to do with the performance of the truck. There is a ECM data log that is stored at all times in the computer that cant be cleared or erased by anything other than starscan. The only good thing is that not all techs no how to use the advanced features of starscan.