Thread: No first gear, possible ECM issue?

Hey, I have a 1997 Pontiac Grandprix 2 door non-SC 3800 with 140,000 miles on it. I just had the typical no overdrive issue and had the transmission swapped out with a used one with 70,000 miles out of the exact same year model and engine. But right before the grandprix was in the shop for that, I also lost my 1st gear. If I move the selector to 1, the car does the same as if it were in 2 or D. I searched around on the web and some people had the same issue and either reflashed the ecu or swapped the ecu with one from a junk yard. Should that be my next step in trying to fix this problem? I can get the ecu out of the same GP that I got the transmission out of. But then I would have to mess with that GM passlock stuff right? Thank you

It goes into drive no problem. Just when I press on the gas, no matter how high the rpms are, it will slowly speed up until 25ish mph then really take off.
I went to the stealership for a reflash and they said it would be 85 bucks so id like to swap this ECU that I have. This whole passlock 1 process sucks tho.
This post is exactly how mine is:
http://www.grandprixforums.net/no-1s...pcm-34713.html

I reset pcm and all that and it still didnt help. Since I just had the transmission swap done, I also had them put in and new filter. So the filters about 4 days old. I did some driving to see whats going on. While in D, It seems like I only have 3rd gear because when I shift to "1", I do have 1st gear. When I shift to "2", there is no difference (no shift, rpm change). Then when I shift it to "3" it will shift. Then when I move it to "D", it will make no difference from 3, just the rpms will go up, no 4th gear or OD. Also when the car is in "D", its doesnt shift at all.