The suspect, Rashaun Bailey, reportedly drove with the victim, Keisha Marshall, in a Kia SUV to the Simi Valley Police station and surrendered.
Marshall was hospitalized with a head injury.
"She has a fractured skull and loss of hearing in one ear," said Chevette Calhoun, Marshall's cousin. "It's a relief that she's alive and a relief that she's going to make it. She's not very coherent at this point."
Monday afternoon, Simi Valley Police had reported they talked to Marshall several times on her cell phone. The police were not able to trace the blocked phone.
Simi Valley Police had requested the assistance of the FBI and U.S. Marshals.
Authorities say Bailey entered Marshall's home, located in the 2600 block of Bloom Street, about 9:40 p.m. Sunday.
Officials found a trail of blood leading from Marshall's home to the street, where police believe Bailey forced Marshall into a car and took her from the scene.
Neighbor Mikayla Garcia described Marshall as a "very sweet girl with a genuine personality," and said her good-natured traits run in her family.
Marshall spent her high school years in Simi Valley with her parents and two siblings. She had recently come home from college in Texas, where her family said she met and dated Bailey.
It's not the first time the two have been involved in a domestic dispute. A family member who called police to the scene Sunday night said Bailey has been violent before.
Neighbors said her violent abduction comes as a shock to their neighborhood.
"Everybody here is really nice people, you know, good people. I hope nothing bad happened to our neighbors," said neighbor Jane Corral.
Authorities said Bailey was considered armed and dangerous.
If you have information about the suspect or the incident, you're asked to call Simi Valley Police at (805) 583-6100.