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Tran Malfunction Code after going WOT in fifth

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Something strange happened while I was on the freeway today. I was cruising along in manual mode 6th gear at about 70 mph and needed to overtake a car in front of me. I proceeded to upshift and rolled into the gas. As I hit full boost (17 psi) the car immediately shuttered as if it hit boost cut, the transmission malfunction code popped right up on my display. I was unable to get any gear to respond and the car just free rev'ed (very dangerous as I was in coast mode). I was able to get to the shoulder safely and as I was coming to a stop. I heard/felt something like a pop and the trans no longer act as in neutral.

I then turned and restarted my car. The message went away and every seem to be back to normal. I was able to narrow it down to this happening in 5th gear only. 3rd/4th was fine. So my questions is, has anyone have this happen? What could have tripped the message since (no cel or any code)?

My current mods:
Jb4 g5 iso on e30
Bms dci
Alpina flash.

Any ideas?Click here to enlarge

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