No injuries or vehicle damage were reported, and the freeway was open in both directions on Monday morning.
According to Cal Fire, the blaze erupted at about 1 p.m. Sunday just south of Grapevine Road. Multiple agencies have responded to the incident, including firefighters from Kern County and Ventura County fire departments, the U.S. Forest Service and the Bureau of Land Management.
No evacuation orders have been issued.
The wildfire was sparked by a car fire that broke out on the northbound side of the 5 Freeway, according to Kern County fire officials.
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The brush fire began amid extreme heat and low humidity in Southern California.
Elevated fire conditions are expected to be in place at least through Friday, and fire-starting lightning is possible Tuesday through Friday.