Fox wasn't in Superior Court as her attorney entered her plea to two misdemeanor counts of driving under the influence and driving with a blood-alcohol level over the legal limit of .08.
If convicted, the former "Dancing with the Stars" contestant could face up to six months in jail and a $1,000 fine.
Fox, 43, was stopped March 20 in the San Fernando Valley after her 2007 Cadillac Escalade passed a black-and-white California Highway Patrol car, according to a CHP report.
After she failed a series of sobriety tests, the report said, the actress began to berate the officers as she was being arrested.
"Fox began to walk away, yelling at my partner, 'Brother, help a sister, are you going to let this racist white cop do this ... well, are you?' " the report stated.
She continued to speak in a "condescending manner" as she was placed in the patrol car, the report said.
Fox said later that she regretted the incident.
"I won't ever make that mistake again," she told reporters in June. "Trust me, I'm going to hire a driver next time."
Fox has appeared in films such as "Kill Bill: Vol. 1," "Soul Food" and "Independence Day."