The package insert for the Dtap vaccine lists "Autism" under the "adverse events" section.
If you go to page 11 on the link below you can read it for yourself.
To be clear, this is what people reported after the vaccine was approved. The report states that "autism", along with the other reactions listed was included "because of the seriousness or frequency of reporting"
http://www.fda.gov/downloads/BiologicsBloodVaccines/Vaccines/ApprovedProducts/UCM101580.pdf
Here is a screen shot from page 11
