Hypertech 83009 HyperPAC 2003-2005 Chevrolet / GMC Pickup Trucks and 2002-2005 Hummer H2 Allows to power tune your vehicle for more horsepower and torque Plugs into your diagnostic port and collects all the necessary data from your vehicle Evaluates vehicle performance with unrivaled accuracy Monitors, displays and clears diagnostic trouble codes Lifetime Warranty