The strike is set to end Tuesday morning, but the nurses are expected to be "locked out" until Thursday because the hospital has hired replacement nurses, who are contracted to work for five days.
The walkout comes after nurses at the hospital went on strike in early October, the first strike at the hospital since 1986.
In a separate strike last week, registered nurses represented by the California Nurses Association walked off the job Thursday at seven Sutter hospitals in Alameda, Contra Costa and Solano counties as part of a one-day strike.
The walkout was the sixth strike organized by the group in a lingering contract dispute with Sutter. The last walkout was in July.