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Re: GM C3 question..is Diagnostic Mode hardwired in ECM?
Posted to Technical Discussion Forum on 5/20/2003

Well, for a 22-year-old PROM, you could try that Ohio Valley Speedo outfit, or (if you plead real well) you might get Hypertech to burn you one. Hypertech kept all its old PROM programs -- OEM and modified -- and might be convinced to drag one off an old hard ... Login to read more.