general problems of the 2012 Mazda MAZDA3

I was driving on the freeway when suddenly the traction control indicator lit up on my dashboard. When I exited the freeway and attempted to make a left turn, my car suddenly lost power. It was as if my car was in neutral. I looked at the gear shift to ensure it was still in drive, and it was. Somehow I made it through the turn and into a nearby parking lot. I turned the car off, waited a few minutes, and then was able to leave. It was scary and upsetting as my car is only 4 months old. The dealer said they won't be able to determine what happened since the indicator is no longer illuminated. I asked if there was any way at all to do a diagnostic test and they said no. I am having a hard time believing this. I'm just glad I wasn't rear ended with my grand baby in the back seat.