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Thread: ecm / bcm flashing questions.. manual conversion problems

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    Default ecm / bcm flashing questions.. manual conversion problems

    so my project is a manual conversion.
    the car has been done with all the trans and 100% done with the hardware.

    the problem is theft deterrent and engine immobilizer and all that crap.

    what i did was flash in a modded tune from the stock one but still needed to see the tcm
    next pat g sent one with a holden trans segment that one could not see the bcm

    the next idea is to flash the car as a gxp using 2009.5 ecm and bcm then modding them to for the l76 and the bcm side.

    im looking for input from the electronics experts out there.
    -will the bcm from a 2009.5 run my 2008 gt?
    -can i transfer the bcm tables(or what ever there called) to the new one?
    -can the 2008 bcm work with the other ecm?

    this was my only concern when starting the project.

    thanks for looking

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    Vendors GTPprix's Avatar
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    You'll need me to build a custom BCM calibration for your car.
    Chris White
    www.gtoshiftlight.com
    2006 Spice Red GTO - Stock
    2012 Jeep SRT-8 Tuned
    2013 SRX - Custom BCM/IPC/CUE
    2013 XTS Platinum - Custom BCM/IPC/CUE

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    I am stuck in the same place and will need to make sure all of the electronics work. We both have 2008s if that helps.
    2008 GT - 2300 Maggie, Comp cam, ARH LTs, staggered Breyton GTS, 6spd Manual conversion DONE!!.
    From previous owner: 552 RWHP, 589 RWTQ; Tuned by Patrick G via EFI live Autocal

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    Quote Originally Posted by GTPprix View Post
    You'll need me to build a custom BCM calibration for your car.
    let me know i emailed you today about it.

    you thinking you can make it wirk with the one i got and the holden trans segment or the gxp ecm flash and my stock settings?

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    would it work if we just got a BCM from a M6 GXP or do they have to be linked via VIN or something?
    2008 GT - 2300 Maggie, Comp cam, ARH LTs, staggered Breyton GTS, 6spd Manual conversion DONE!!.
    From previous owner: 552 RWHP, 589 RWTQ; Tuned by Patrick G via EFI live Autocal

  6. #6
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    Unfortunately no there were many electronics changes between 08/09 and 09.5 plus you are correct there is the vin mismatch issue.
    Chris White
    www.gtoshiftlight.com
    2006 Spice Red GTO - Stock
    2012 Jeep SRT-8 Tuned
    2013 SRX - Custom BCM/IPC/CUE
    2013 XTS Platinum - Custom BCM/IPC/CUE

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    they have to be linked. not sure if it will work from a bench or if they have to be connected and flashed in the car.

    im about to fit a 4 barrel carburetor on there and use an e-rod harness for spark. haha

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    I wonder if I could sweet talk my GM dealer into reprogramming the ECU and BCM with a manual GXP tune and to link it to my VIN.
    Last edited by Posidon42; 04-01-2013 at 05:55 PM.
    2008 GT - 2300 Maggie, Comp cam, ARH LTs, staggered Breyton GTS, 6spd Manual conversion DONE!!.
    From previous owner: 552 RWHP, 589 RWTQ; Tuned by Patrick G via EFI live Autocal

  9. #9
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    Quote Originally Posted by Posidon42 View Post
    I wonder if I could sweet talk my GM dealer into reprogramming the ECU and BCM with a manual GXP tune and to link it to my VIN.
    09.5 has different hardware flashing it will brick the modules. Would also set tamper flags with other modules in the car.


    Sent from my iPad using Tapatalk HD
    Chris White
    www.gtoshiftlight.com
    2006 Spice Red GTO - Stock
    2012 Jeep SRT-8 Tuned
    2013 SRX - Custom BCM/IPC/CUE
    2013 XTS Platinum - Custom BCM/IPC/CUE

  10. #10
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    need 2009.5 ecm/bcm
    dealer can flash it as a gxp vin but i dont know whats different in the program,body,signel....ect
    only really one way to find out and my car is 1600 miles away taking up space
    greg can flash bcms and is working on flashing ecms maybe if your around long enough well try that on yours.
    rember you will have to do clutch learn and break relearn at the dealer unless we can get a tech 2 scan tool.
    and i think the engine imoblizer will need redone.

    also was thinking of doing a full holden flash with our ecm/bcm but god only knows whats diff in the bodys of the cars. so i think gxp will be best.

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