Authorities said the boy was walking home from Acacia Middle School in Hemet on Wednesday when a man drove up in a green truck and asked if he would help him find a lost dog.
The student returned to the school and reported the incident. The man did not attempt to grab or block the boy as he fled, according to police.
On Thursday, an officer pulled over a truck matching the boy's description. Terry Allen Grisso was detained and arrested for suspicion of driving with a suspended license.
Grisso was interviewed for the school-related case and evidence was found for the molestation charge, police said.
City News Service contributed to this report.