The fire, dubbed the Porter Fire, broke out before 4 p.m. Sunday near 11200 Porter Ranch Drive south of the 118 Freeway.
On Monday evening, the Los Angeles Fire Department said "there continues to be hot spots and active flames," but the fire is held to about 4 acres. The fire was last reported 75% containment.
The fire was fanned by 10-15 mile per hour winds. Officials say a civilian pickup truck parked at the Porter Ranch Drive park-and-ride lot adjacent to the 118 Freeway was destroyed by fire, but no one was injured.
Officials determined the fire started at or near a freeway-adjacent homeless encampment, though LAFD is still working to determine the cause of the fire.
City News Service contributed to this report.