Check your rear brakes and inside the rear Rotors. There are ABS scanners and if Autozone or Oreillys have that type of scanner, they will scan for free.
Because the Trac Control is on the Rear axle all of your problems are probably rearward. What usually happens is the Emergency brake material and the Rotor pads wear down and blind the sensors. Sometimes the Trac Control will destroy the brake linings. The Trac Control works by applying the rear brake to the fastest spinning wheel in an effort to match each rear wheels speed.
When the sensors have debris flying in front of them, they miscount and include the debris in figuring RPM. Someone needs to disassemble and inspect the back brakes.
SOURCE: low trac light
I had the exact same problem with my 2004 Cavlier. I took it in and the dealer said it was a voltage problem with my speed regulator located in one of my wheel bases. I had it replaced under my extended warenty. I suguesst taking you car to a mechnanic as soon as possible, cause it could be that sensor, or an electrical issue all together. Especially if it is that sensor, since it effects your braking system, traction system, and the overall drivability of the car.
SOURCE: trac off light and abs light on
you have a damaged, dirty or defective wheel speed sensor. This can only be determined by an experiened mechanic. Hopefully this helps
SOURCE: service engine soon/ABS/Trac lights are staying on
Have the ABS codes scanned. This will get you started in the right direction. Possibility is that one or more of the wheel speed sensors is not working or intermittent - could be wiring or connectors on these as well. Another possibility is the EBCM, Electronic Brake Control Module. I believe the EBCM will throw 1216 code in many cases. THese can be rebuilt online for about $150.00.
The more likely problem is the wheel speed sensors. THese are an integral part of the wheel hub. About $100.00 each for the part. About $250.00 each to have them replaced. They can be tested with an AC voltmeter by spinning the wheel. Also, they should read roughly 850 ohms resistance. The ABS codes will tell you which ones are not reporting.
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