Unfortunately, the code from the .pdf did not work. The Xgauge doesn't return anything.
The onstar system returns a lot of information. Basically it runs some sort of on-board diagnostic system on the entire car. Some of the info I receve includes engine (throttle control, fuel control, air induction, ignition system, etc), transmission, emmissions, airbag, electrical, onstar itself, mileage, oil life, and more. It also lets me make phone calls, ask for directions, and get help if I crash. It's free for the first year. I'm not sure if I'll renew when my year is up.
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