For people selecting TCM tuning PPEI needs the operating system number from the TCM which is not retrievable without the Autocal first. If you do not plan on using the Edge Insight please select the DSP5 switch.įor 2006-2007 model years, the DSP5 Switch is the only method to change tunesįor those with an automatic transmission equipped Duramax, you have the option to add PPEI's exclusive TCM (Transmission Control Module) tuning that will deliver a crisp shift pattern optimized to work in tandem with their engine tuning calibration. PPEI needs to know if you plan using the Edge Insight, because it must be programmed into the AutoCal. ![]()
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