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04-22-2010
I just finished installing an 03 gt motor, transmission, cooler lines, and PCM in my 1999gt. I used the 99gt raange switch. The cars runs good, and PNR work, but when I put it in D, it wont shift out of first, and It does the same thing when I tried to manually select 2 and 3. Does anyone know what could be causing this? Any help would be appreciated!
04-22-2010
You need an 03 PCM for that tranny, they are different... and that is what's causing your issue.
Here is an article from Clubgp about this.
ClubGP Message Forum troubleshooting
Let me know if I can help.
04-22-2010
I did use an 03 pcm
04-22-2010
Whats the serv no on the PCM? Mine is Service Number 12209624
04-22-2010
I dont know too much about transmissions. What is the servo?
04-22-2010
oh, service number, yeah it was on there. I dont recall what it was though. It came off of the 2003 gt
04-22-2010
Did you use the range switch off of the 03? or did you use your old one?
04-22-2010
Look at the back side of the PCM.. should be a sticker that says Serv. No :
The white sticker in this picture.
04-22-2010
Forgot to mention, it also makes a "winding" sound when it gets close to 3000rpm
04-22-2010
I just swapped the tranny, no other electrical swaps.., and I had the exact same issue. I was trying to run my old 2001 pcm and it wouldnt work with the 03 tranny.Originally Posted by topswap
04-22-2010
Hmmm thats interesting. I just cant figure it out because I used the PCM from the donor car. I think ill go out and check the PCM for a #
04-22-2010
Just checked, and its the same pcm # 12209624
04-22-2010
That is the right PCM number, do you know anyone with a Powrtuner (To re-flash the PCM with an 03 GT file)? I was thinking you had the wrong service number the whole time. The PCM swap fixed my issue.
04-22-2010
Have you tried your old PCM just for ****s and giggles?
04-22-2010
Good Point Dagger... i didnt see that you responded until after I wrote this... however, my experience is below.
I tried/bought 4 different PCM's and they wont' work. Just first gear... I have a spare 03 Regal LS PCM... It has a different service number.. so i never tried it. The other buick PCM... the car wouldnt even crank. I could try to flash it... but that doesnt mean it will work. I wonder if your PCM is like an early model of that serv no...it was my understanding that 03+ PCMs had different internals... so if you used a non-03 ... you would get the shifting issue. .
This is my original post on CGP.
ClubGP Message Forum troubleshooting
04-22-2010
I put my 99 PCM back in and IT WORKS!!!! Go figure.Thanks for all your help guys
04-22-2010
Want to sell that extra pcm or trade.... for an extra
04-22-2010
Sure, just give me a few days to make sure everything is alright with the current setup, and I would be interested in a trade
04-22-2010
Good deal i got several extras. Just let me know
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