2G WIERD shifting problems

[black97spyder]

Ok so this is a wierd one and It's a pretty narrow solution. But doesn't explain why It's happening.

Everything has been shifting fine since I got my new DSM up and running about 2 months ago. So after cruising earlier today I went home and kinda got on it and went thru 2nd and 3rd when I was almost there. Still no problems...

So i jump in my car to go to town a few hours later, I left my house and the car absolutely would not shift for the life of it when jus trying to baby around (auto). I checked the fluid and it was a tad over a quart low so topped it off, car still wouldn't shift when you would jus slowly speed up. I then put boost to it and it would shift under boost (about 1/3 throttle) but when i slow down to stop it downshifts on its own and in order for it to shift I have to semi- get on it so it even shift. After I realized it would shift under boost I very slowly sped up thru the gears and found that it will shift without getting on it right above 4,000 rpm if i hold it there.


ANY and ALL input would be appreciated from the community. Thanks guys!

 

[PrimerPLus]

I don't know much about the automatics but if it was working fine before and it is not I would suspect a bad tcu. Also do you have any cels? Check out this thread.
Auto tranny not shifting

 

[black97spyder]

I was thinking tcu as well or maybe even shift selenoids. I had a CEL on for shift selenoid malfunction for awhile which was a tranny code but im sure that It's from my non lock-up converter so the tcu thinks the lock-up selenoid is bad when it really isnt...

Im kinda at a loss right now because everything has been perfect and all of a sudden It did this

 

[BurrowZ]

See if you have any other CELs, specifically maybe for a TPS.

 

[black97spyder]

So I fixed the problem!!!! The damn TPS was half way unplugged!! Plugged it back in and zip tied it down and everything shifts perfect now


Seen your post after I fixed the problem but thank you very much burrowz!! It's much appreciated