The Camden County Prosecutor's Office says 45-year-old Anthony Granger sexually touched a 15-year-old on Dec. 14 while he was giving her a ride home.
Prosecutors say the assault stopped when the girl's mother called her on the phone to ask where she was. Granger then drove the girl home.
Granger, who is the freshman football coach at Camden's Woodrow Wilson High School, was arrested Monday at his Cherry Hill home.
Granger was expected to be taken to the Camden County jail, with bail set at $40,000. It was not clear if he had retained a lawyer.