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Does anyone know of a way to make trouble codes display without the OBD2 code readers? A couple of friends who own Dodges and Audi's say if you click you ignition on 3 times a code displays in the information panel. Does anyone know if this applies to GM trucks? If it does, does anyone know where i can look at or download the code book to figure out what the codes mean? Any help appreciated.
 

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