Did my car go into limp mode?

Fabsnoop

Hey guys,

Here's the scenario. I'll drive on an on ramp in second gear, i'll slow down during the apex, but leave it in gear (let's say i'm at about 3500rpm's going into the turn) after the turn, i'll hit the gas on the straight away and the car will go into limp mode? It'll shut off and usually won't turn on for about 30 min or so. Recently it happened, but this time the car didn't turn back on. I figured the battery must be dead from failed attempts to start the car, so i tried to jump start it. Didn't work.(yes i had gas) Now the car is at nissan. They're still unsure of what the problem is. Any ideas, guys? It's an 09, MT, 52k, engine was replaced by nissan at 44k miles due to a thrown rod. I hope I explained what's going on well enough to understand. If not, lemme know. Thanks guys.