ADAS calibration on a Gmc restores the aiming and reference points for cameras (and related sensors) after windshield replacement or ADAS-related service. In many Gmc trims, the windshield-mounted forward camera is the primary input for lane keep assist, lane departure warning, automatic emergency braking (AEB), adaptive cruise control, and forward-collision alerts. Because these systems rely on precise alignment and a clean optical path through the glass, calibration verifies the camera is "looking" at the road from the correct angle using OEM standards. There are two common procedures. Static calibration is done parked in a controlled space with OEM targets, exact measurements, proper tire pressure, correct ride height, and scan-tool commands. Dynamic calibration is performed on the road under manufacturer-defined conditions so the vehicle can relearn lane markings and distance cues. Some Gmc vehicles require one method; others require both depending on model year and ADAS package. A solid workflow typically includes VIN-based feature confirmation, a diagnostic pre-scan, completion of the required static/dynamic routine, and post-scan verification with documentation. Costs are usually in the hundreds, often about $300-$600, though complex systems can be higher. Bang AutoGlass explains the calibration path for your Gmc before installation so you know what's included and why.