Yup it is pretty cool! I have had to use it to find a code already when I had a ETC- ie drive by wire light come on. It was just like you said three clicks of the key , and up came my code. I was able to then go fishing the net for TSB's , and right away I was able to find a TSB concerning a reflash. (this is for a Hemi 2500)
There is another self check , and it involves holding the trip/odo button down turning the key to "on" for a couple of seconds. This will run the guages through a complete self diagnostic. You have to try this because it is a trip. I only found this because that is what someone told me was how you recover the total hours the truck is on.
There is another self check , and it involves holding the trip/odo button down turning the key to "on" for a couple of seconds. This will run the guages through a complete self diagnostic. You have to try this because it is a trip. I only found this because that is what someone told me was how you recover the total hours the truck is on.