 On 4 Jul 1516, Pedro del Campo was appointed during the papacy of Pope Leo X as Auxiliary Bishop of Toledo and Titular Bishop of "Utica" and Auxiliary Bishop of Toledo (1516–1551).He served as Auxiliary Bishop of Toledo until his death in 1551.While bishop, he was the principal consecrator of Juan Yañez, Bishop of Calahorra y La Calzada (1544).