Designed exclusively for GM vehicles (Buick, Chevy, Cadillac, Opel), this easy-to-use tool relearns your tire pressure sensors after tire rotations, sensor replacements, or when the warning light won't turn off. Simply put your car in TPMS learn mode, hold the tool against each tire valve stem, and press the button. The horn chirps. The sensors are reset. Plus, it doubles as a digital pressure gauge – accurate up to 150 PSI.