Pontiac Repair: Problems, rear hubs, speed sensors

Question
I have a 1999 Grand Prix GT 3.8 V6 and my trac light, abs light, and my srs air bag light will pop on and off and i put it on a scan tool and it didnt show any codes. So my question is what would cause them to come on and off and is there anything that i can do about it?

Answer
Hi Andrew.
if the light is on and stays on there will be codes set. aftermarket fits all code readers don't work on all cars even know they say they do. Are you sure it's the SIR not a Service Vehicle soon? the most common cause for trac and abs codes are a wheel sopeed sensor or the jumper harness that plugs into the speed sensor it's 80/20 as to front hubs VS rear hubs (the speed sensors are parts of the hub) and 90/10 90 bing a bad hub and 10 a wire harness. stop by one of the big box auto parts stores and have the car scanned they do it for free maybe they have a better reader then you do. Start there untill you know what the code(S) are it's just a guess! good luck :-)