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The trac light probably came on because the engine light came on. You would need to get the computer scanned for trouble codes, and find out if you are missing spark to the plugs or fuel to the injectors to proceed with testing.
If you had the car scanned with a generic OBDII code reader (Which is what they use at all the parts stores) this is probably why it is not showing any codes. You have "Vehicle Specific" codes. This means that the problem with your Check Engine light is not a problem that will generate a "generic" OBD code. A generic OBD code reader will not read codes from your Antilock Brake System or your Traction Control System at all... You need to have it scanned professionally by someone who has the proper equipment and software to access the Controller Area Network (CAN) in your vehicle.
There are wheel speed sensors that are located in each hub. These sensors are usually responsible for the ABS/trac off/low trac lights coming on. There are couple of things that could cause one or all of these sensors to activate the "Trac Off" light. Such as a bad sensor or an issue with the hub bearings.
However the most common cause of this is a problem with the wiring. Since the sensors are subject to the elements they tend to fail due to corrosion. In fact this is an on going issue with 2000 - 2005 Grand Am's and Grand Prix's. If you have mechanical ability you should inspect the connections and sensor. Clean the and use some Die-electric spray on the connections. Then disconnect the battery for at least 15 minutes to reset everything and wait to see if it returns. If it does you might want to go to a mechanic because this can also effect the ABS system. Hope this helps.
I asked the mechanic when I got the new tires put on and he said this could be 'fixed' by repacking the bearings. This is plausible if one or more are dragging and causing the sensors to detect too much variation in the speeds.
Since the new tires have been on, only a few errors and not any lately even with a sharp turn. The temperature seems to have an effect.
i will ask more mechanics in the next few weeks and report.
I have this same problem and had it checked. It is the wheel sensor. Mine is the passenger front right wheel sensor. According to the mechanic I take it to the GrandAm's are known for this. The part is about $40.