Tech2 is no longer used by GM. It has been replaced with a lap top, software and interface module. The change occurred about 2010, any new car platforms require the new technology. Make sure the tool you buy is compatible with your year model.
xm is a subscription, you can pay for it monthly as well as other billing periods. Call them up after your xm stops to enroll. They will want a credit card. Mention to them that you just bought the car and they usually will give you 30 or 90 days free. Sounds like the previous owner still has...
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