Did you plead no contest at your arraignment? What is your reason for wanting to take it back now? While you are still within the time frame to do so, you have to have some reason other than "I didn't like the consequences." Talk with an attorney to see if this is even a possibility now - and next time, don't try to do this yourself.
Mr. Feasel is a former prosecutor in San Mateo County (CA) with over 10 years of criminal law experience. Nothing stated on this site shall in anyway be construed as legal advice, or as creating any attorney/client relationship. If you would like to hire Mr. Feasel to further investigate your situation, feel free to contact him thru this site.
The odds of you or an attorney being a successful in withdrawing a plea in a traffic case are slim and none. Unless you were somehow mislead into pleading no contest nothing is changing that plea. It would be an extraordinary circumstance to get this plea withdrawn. Good Luck Ron Bamieh