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  Something good about successful control module programming for GM vehicles: It’s becoming second nature for many repairs — reprogramming vehicle control modules with updated calibration files using the Service Programming System (SPS). The calibration files contain the data that manage vehicle control functions. The programming process uses Pass-Thru Programming through the Multiple Diagnostic Interface tool ( MDI / MDI 2 ). But successful reprogramming of an existing control module as well as programming a new module, including for installation of GM Accessories, requires that the programming process be followed properly every time, including correctly preparing the vehicle for programming, setting up the necessary tools, and reviewing the Service Information. Check the Service Information Every Time The Service Information should always be reviewed for the appropriate programming and set-up procedures of an individual module. Based on the control module being pro...