You should apply the parking brake, place the transmission in the park position for automatic transmission or neutral for manual transmission, install a scan tool, clear all BCM DTCs before proceeding, turn on the ignition, with the engine off, select Computer/Integrating Systems menu item, select Module Setup menu item, select BCM menu item, select the BPP Sensor Calibration procedure and follow the directions displayed on the screen.
By BobGM Specialist
29/10/2022