OBD2 code reader $40 ??

Any info about code reader obd2 (car tool U10 tech and other as CreaddEr) sold for around $40 on Ebeay ? works good on GM or not?
Denis

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D. Gignac wrote:

AutoZone will read the codes and give you a print out free. Of course, this will not help you if you don't live near an AutoZone store.
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