11/16/10 purchased 2008 Trail Blazer, shortly after purchase traction light came on and stayed on. Took in to service where I was told couldn't help me that day, make an appointment to have vehicle scanned. Took back light wasn't on and couldn't get code. Believe in January 2011 got the code and sensor had to be replaced, job done. Light came back on, scanned said it was module which was the other code that was given before but didn't fix module when doing sensor so took back in for module to be replaced. The day I pick up from shop going home light came back on. Called dealer & told to bring in next day. Did so but no code but vehicle was kept, GM called and supposedly all procedures were followed by GM and nothing could be found. On 3/18/11 light back on & again on 3/22/11. Dealer scanned vehicle again said it was same code as last one which was the module, that had been replaced and told nothing more they can do, have to take vehicle as it is. NOTE: Light clears self when engine is shutoff.