When using a code reader that just shorts the terminals together, you are limited as to the information thats available. They will give you an idea of where the problem is, but youve just touched the surface of whats available to you. The next step up in code readers is a device like the AutoXray. These types of readers provide you with any errant codes, along with actual data from the various sensors. This can narrow down a trouble area. With this type of code reader, the problem code is mentioned in English instead of a numerical code. The AutoXray scanner will run a couple hundred dollarsmoney well spent if it saves you a trip or two to the shop. Even if your Corvette does go to the shop, knowing where the problem lies provides you some form of insurance against the size of the bill.