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Soo my Chevy cavaliar just got back from a shady mechanic and he fixed the problem.. Cracked heads... and now every now and then driving all of a sudden the Trac off light will come on and the car starts having problems shifting gears! any ideas?  

the traction control light coming on...    indicates a trouble code has been set....  the only way to tell whats wrong is to access the trouble code with a scan tool...  

then follow the trouble shooting charts on line or in the factory service manual...

there are a lot years of those chevys made...  if you need more help when you post a code...  post year , make , model, engine ,, and which transmission if you know it...


the traction control unit uses the antilock brake wheel speed sensors... along with a bunch of other things...   including some of the sensors from the air bag system...  

autozone.com will have some data on the system...    but you did not post a year.. or an engine..

eautorepair.net   is mitchell manuals. site..

alldatadiy.com is alldatas site...   both have factory repair infomation...