Yes, it is possible to be a "carrier" of autism, but not have it yourself. Carriers of autism are typically parents, siblings, or other close relatives of someone with autism. They may have the same genetic mutations that are associated with autism, but not the full range of symptoms associated with the disorder.
The risks of being a carrier of autism are higher for individuals who have a family history of the disorder. Studies have shown that if one identical twin has autism, the other twin is more likely to have autism-related traits, even if they do not meet the full criteria for a diagnosis. Other family members may have some of the same genetic mutations associated with autism, but may not have all the symptoms of autism.
It is important to note, however, that being a carrier of autism does not guarantee that a person will develop the disorder. In fact, most carriers of autism will never develop the full range of symptoms associated with the disorder. The exact risk of developing autism is not known, but it is believed to be quite low.
Ultimately, it is possible to be a carrier of autism without having the disorder yourself. Carriers of autism typically have the same genetic mutations associated with the disorder, but not all of the symptoms. Furthermore, the risk of developing autism is believed to be quite low for carriers.