Gable is the 52-year-old son of the late Hollywood screen icon Clark Gable.
He was arrested Tuesday and charged with DUI and hit-and-run after he rear-ended one vehicle and hit six other parked cars.
Gable told the entertainment news website TMZ he was not drinking alcohol before the incident, but did lose consciousness.
He said he has previously suffered two small brain aneurysms and suspects a third might have caused him to have the motor-vehicle accidents. He told TZM he is undergoing medical tests in an effort to determine what happened.
TMZ said Gable's blood alcohol test results have not been released.
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