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They are calibration updates we put into your computer for making your driving experience even better. Downloadable from our GM link TIS2000. This is dealer performed. Every so often GM releases new calibration for PCMs to help manage the over system of a component or components. As you see, there is an update to eliminate wheel hop.
Since GM is closing us down soon, I like sharing their info with everyone. Boy do I love copy and paste.
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