I have a 2001/2 Spec C5. I want to buy a scan tool Preferrably PC based so I can reset all my codes if and when. You can get most of the codes up on the dash.
The best PC based scan tool is by EASE (OBD2). It has a bidirectional cable and you not only can scan and reset codes, but also do CASE Learn procedures, etc. It is OEM based and licensed by GM, it has modules for scanning PCM, BCM, etc like a tech 2. If you want to reflash GM PCM updates there are modules for that also. Pricing runs from 350 on up.