Still need to know what model ESC it is. It could also be helpful to know what motor and rig were talking about. A short video of the problem would be extremely helpful. Is the LED yellow or orange? Is it flashing or solid?
Not to be an ass but your description of the problem is like walking up to a mechanic and saying "Hey man, one of the lights on the dash of my car is lit up. The car starts but wont turn." When the mechanic asks you what kind of car you have you response is "Its a Dodge..." Its really hard to diagnose problems over the internet as it is but when you give next to no information to go on it becomes almost impossible.