Deputies responded to a call of a baby not breathing in the 5700 block of Monaco Lane at 9 p.m. Friday, according to the Los Angeles County Sheriff's Department.
The child was transported to a hospital where he later died, authorities said.
Deputies have interviewed the infant's parents, but no arrests have been made.
The boy was found unresponsive in a carseat inside a vehicle outside the home, detectives say.
Anyone with information about this death is asked to call the Sheriff's Homicide Bureau at 323-890-5500. Anonymous tips can be called in to Crime Stoppers at 800-222-8477 or submitted online at lacrimestoppers.org.
City News Service contributed to this report.