OBD-II Scanner
OBD II is an open-source data protocol, mandated by the Feds. That means that ALL of the software
scanners are going to retrieve exactly the same information (unless you buy a GM-specific shop
maintenace computer & can access the GM corporate site).
There is a useful package here, if you already have a laptop of your own: http://www.obd-2.com/
When I bought mine it included the plug, data interface chip, and GUI for ~$125.
Note that while the data protocol is standard for all OBD II cars, GM, Ford, and Chrysler each came up
with a unique output signal, so one tool wouldn't be able to read all 3 brands. Go figure...

















