Exploration of potential preliminary screeners, and examination of social intervention outcomes for effects on comorbid symptoms is imperative. The Child Behavior Checklist (CBCL; Achenbach & Rescorla, Achenbach and Rescorla, Manual for the ASEBA school-age forms & profiles, University of Vermont, Research Center for Children, Youth & Families, 2001) provides a potential ASD screener and intervention outcome evaluation. This study had two aims: (1) to examine CBCL scales scores as a potential ASD screener; (2) to investigate PEERS® outcomes via the CBCL for Autistic adolescents. Results indicated elevated scores on four CBCL scales in the ASD groups, contrasted to a typically-developing group. Furthermore, decreases in the two CBCL scales for adolescents that received the intervention were found. Findings support prior research indicating a unique CBCL elevation pattern as a potential screener for ASD, and provide additional support for the efficaciousness of PEERS®.