Check Engine Light Came On on 2003 Suzuki Aerio

My check engine light came on. Stopped at Advance Auto. They hooked up to a hand held computer. The reading was: torque converter. What is that? The light went out on its own before my mechanic could see it.

Asked by for the 2003 Suzuki Aerio
1 answer
it is part of the transmission. the code number would really help.