Jameson was arrested on May 25 after her Range Rover struck the pole in Westminster, resulting in minor injuries. Prosecutors in Orange County say tests showed her blood-alcohol level was .05 percent above the state legal limit.
Jameson was charged with three misdemeanor counts, including driving under the influence of alcohol or drugs, driving with a blood-alcohol level over the state legal limit and driving on a suspended license.
She entered her plea on Tuesday.
Jameson's attorney, John Marshall Kremer, told City News Service that his client declined to comment.
Jameson crossed into the mainstream after publishing a popular autobiography in 2004.