GM has abuse maagement built into the pcm and ecm that will over ride that button. Try doin a burn out on dry pavement, it may let the tires turn over a few times but thats it. I knew of guys that would try to override it by unpluggin their abs module not allowing the computer to read tire speed but it's only a temp fix, plus your DIC goes nuts and it can throw your car into limp-home mode. A tune was the only way I could get the GXP to release its grip on the world. JME