G8 GT to GXP Computer Swap

[ACE Performance]

Have a 2009 G8 GT and want to switch to the GXP computer as its a newer model and has 127 inj limits not 63.5. I have a computer out of a crashed gxp and was wondering how to get it to work. I have installed it and tried to start and it says immobilizer or immobilized I think and the starter will not turn over. I tried changing the vin number to the car I am installing it in and that did not work. Do I need to disable VATS in HP Tuners or take it to a dealer for some sort of reprogramming? What am I doing wrong?

[schpenxel]

How big of injectors are you trying to run?

[ACE Performance]

How big of injectors are you trying to run?

Injectors are just one reason I want to change. I dont want to scale or do the double afr half ifr deal. I have the hardware just want to know how to make it work. I know it has been done before by David, Dsteck, Just have not had any luck getting in touch with him. I have asked before but cant seem to get an answer. Figured if anyone knew how to do it, it would be on here. Any help would be greatly appreciated.

[luisdavid11]

disabling vats will work and the car will run fine. however, you will have the "Engine Immobilized" message on the display in the dash and some features such as the remote start won't work.

[ACE Performance]

disabling vats will work and the car will run fine. however, you will have the "Engine Immobilized" message on the display in the dash and some features such as the remote start won't work.

Great thanks! How do I get the message to go away?

[luisdavid11]

well since you're disabling vats, the ecm will fire up but since the bcm and ecm dont match up the bcm will throw that message. i don't think there's a way of getting rid of it with hptuners since it's in the bcm, i may be wrong though

[ft2lewis]

hey ACE, what are you going to do with the original ECM? I think I may have fried mine.

[Faqz09]

Did you successfully use the gxp ecm?