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Thread: PCM and BCM compatibility

  1. #1
    Potential Tuner
    Join Date
    Jan 2019
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    PCM and BCM compatibility

    Hi I'm new to the forum, I have a 2002 monte carlo with a 3400. I have a supercharged 3800, 4t65e-hd transmission, engine harness, and pcm out of 2005 gtp comp g that I am putting in the monte. My question is would the 2005 pcm communicate with my bcm right, or it there anyway to get a 2002 pcm to run that transmission?

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    That type of swap can't be done. The 2004+ computer in the grand prix's are a completely different style of computer and will not plug into anything on your vehicle. The fuse block connections and wire harness to the PCM are not the same.

    I would have said to run a 2004-2005 monte ss supercharged computer but that still runs the older computer style and they never had tap-shift.



    Maybe someone else has done that swap but for sure you can't run a 2004+ grand prix computer in your car and have it work with your other systems.
    Last edited by 5FDP; 01-12-2019 at 06:40 PM.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  3. #3
    Potential Tuner
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    Jan 2019
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    I was kinda thinking the same thing, I was just hoping someone had some ideas to make it work. The transmission came with motor and only has 80,000 miles on it.