Jameson, 38, whose given name is Jenna Marie Massoli, was taken into custody by Westminster police May 25 after her Range Rover struck the pole.
Jameson's attorney entered the guilty plea for his client. The charges were misdemeanors, and Jameson was not required to appear in court.
Jameson was originally charged with three misdemeanor counts, including driving under the influence of alcohol/drugs, having a blood-alcohol level over the state legal limit and driving on a suspended license. The suspended license charge was dropped Thursday.
The actress-turned-author must serve three years informal probation, pay $340 in fines, enroll in a first-time offender DUI course, and participate in a victim impact panel.
Jameson suffered minor injuries in the accident near Springdale Street and Westminster Boulevard.
Jameson currently resides in Huntington Beach, according to her Twitter page.This story was reported by Times Staff Writer Richard Winton.