When the ABS (Anti-lock Braking System) light is on in a Pontiac Torrent, it indicates a fault or malfunction in the ABS system. This could be due to issues with the ABS sensors, hydraulic pump, or control module. It is recommended to have the vehicle diagnosed by a qualified mechanic using a diagnostic tool to identify the specific problem and perform the necessary repairs. Ignoring an illuminated ABS light may compromise the effectiveness of the braking system.