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Authentic GM software provides the most comprehensive diagnostic software for late model GM vehicles. The Tech 2 also supports onboard diagnostics and full bi-directional control when performing powertrain, chassis and body diagnostics. Note: Optional TIS software for ECU reprogramming and tester updates can be purchased direct from ACDelco . The Tech 2 Pro Optima gives you the same benefits as the Tech 2 pro, but in a streamlined package, making it more affordable. Features and Benefits: Authentic General Motors Tech 2 scan tool Full, dealer-level diagnostics Preloaded software that doesn’t e