It means they read codes in your engine computer....that have almost nothing to do with the warning lights you have. You need someone friendly, like me, that works at a dealer OR has a GM Tech2 to read codes in the other computers on your truck.
It means they read codes in your engine computer....that have almost nothing to do with the warning lights you have. You need someone friendly, like me, that works at a dealer OR has a GM Tech2 to read codes in the other computers on your truck.
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