Thread: Transmission wont shift out of 1st

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  1. #1 Transmission wont shift out of 1st 
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    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!
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  2. #2 Re: Transmission wont shift out of 1st 
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    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.
    02 GTP 13.6 @ 100mph - SOLD
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  3. #3 Re: Transmission wont shift out of 1st 
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    I did use an 03 pcm
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  4. #4 Re: Transmission wont shift out of 1st 
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    Whats the serv no on the PCM? Mine is Service Number 12209624
    02 GTP 13.6 @ 100mph - SOLD
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  5. #5 Re: Transmission wont shift out of 1st 
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    I dont know too much about transmissions. What is the servo?
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  6. #6 Re: Transmission wont shift out of 1st 
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    oh, service number, yeah it was on there. I dont recall what it was though. It came off of the 2003 gt
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  7. #7 Re: Transmission wont shift out of 1st 
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    Did you use the range switch off of the 03? or did you use your old one?
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  8. #8 Re: Transmission wont shift out of 1st 
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    Look at the back side of the PCM.. should be a sticker that says Serv. No :

    The white sticker in this picture.

    02 GTP 13.6 @ 100mph - SOLD
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  9. #9 Re: Transmission wont shift out of 1st 
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    Forgot to mention, it also makes a "winding" sound when it gets close to 3000rpm
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  10. #10 Re: Transmission wont shift out of 1st 
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    Quote Originally Posted by topswap View Post
    Did you use the range switch off of the 03? or did you use your old one?
    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.
    02 GTP 13.6 @ 100mph - SOLD
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  11. #11 Re: Transmission wont shift out of 1st 
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    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 #
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  12. #12 Re: Transmission wont shift out of 1st 
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    Just checked, and its the same pcm # 12209624
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  13. #13 Re: Transmission wont shift out of 1st 
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    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.
    02 GTP 13.6 @ 100mph - SOLD
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  14. #14 Re: Transmission wont shift out of 1st 
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    Have you tried your old PCM just for ****s and giggles?
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  15. #15 Re: Transmission wont shift out of 1st 
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    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
    02 GTP 13.6 @ 100mph - SOLD
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  16. #16 Re: Transmission wont shift out of 1st 
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    I put my 99 PCM back in and IT WORKS!!!! Go figure. Thanks for all your help guys
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  17. #17 Re: Transmission wont shift out of 1st 
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    Want to sell that extra pcm or trade.... for an extra
    02 GTP 13.6 @ 100mph - SOLD
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  18. #18 Re: Transmission wont shift out of 1st 
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    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
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  19. #19 Re: Transmission wont shift out of 1st 
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    Good deal i got several extras. Just let me know
    02 GTP 13.6 @ 100mph - SOLD
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