When my autistic son gets overly excited he constantly covers his ears, it has nothing to do with loud noises. how can i get him to overcome this?

Stimming and safe: This might be stimming or self stimulation behavior. It is safe and does not need special training to remove. A wonderful resource is the thinking person's guide to autism http://www.Thinkingautismguide.Com/ this website has great information about autistic children and adults as well as support for care givers.

Common Pattern: This behavior is a common pattern among autistic children because they process sensory input differently. In neurological terms this can be considered a behavioral automatism. The treatment is really the cognitive and occupational therapy that he should be getting as coping mechanism.