So when I got my 00 gt the old owner gave me the tuner with it and I never bothered to use it because when I tuned the car it shifted weird and a code always popped up so I always kept it stock.. So recently I tried updating the tuner but it got locked so I had reset lost the old tunes. So I contacted AM and they sent me the old tunes after I fixed the tuner with sct. So after tuning my car a couple days went by and the the o/d light started flashing and it gave me this code P0781. Do you guys have any idea what could be happening?