Originally Posted by Jhill

Why do people insist on trying to troubleshoot with zero information (scanner). Do you know how many things can set codes off in today's cars?

That being said what you are describing is a classic symptom of a wheel speed sensor harness going open while turning, extremely common on certain GM vehicles and typically the left front wheel (9 out of 10 times). Sometimes it happens so fast that the scanner will never show it in the data list (wheel speeds) and you will have no code as the system thinks it is doing its job (sees unequal wheel speeds and activates traction control). Yours having a light that is staying on is a awesome, that means it is trying to actually tell you something so get a scanner and see what it says.