Although co-teaching has become a popular approach to special education service provision in inclusive classrooms, practitioners have struggled to carry it out well. One suggestion for improvement has been to provide co-teachers with training that includes coaching. In this study, we used single-case (ABAB) withdrawal design, to investigate the effects of eCoaching, delivered through online bug-in-ear technology, on co-teachers as they planned and carried out co-teaching. Participants included three co-teaching dyads (n = 6); each comprised of one general and one special educator. Visual inspection of graphed data along with quantitative analysis (i.e., percentage of non-overlapping data) confirmed that eCoaching increased participants' use of varied co-teaching models and student-specific accommodations, while co-teachers' interviews and students' time samples verified social validity. Taken together, these findings lead to better understanding of the benefits and limitations of eCoaching with co-teachers.