X15 swap with isx 2250 problems.

[Kiko]

Hello all. I’ve had a client with a 2019 Peterbuilt take out his x15 2350 I believe and install a 2014 isx 2250 into the truck. Had it running but some trouble. First off the vgt is stuck and won’t communicate. Showing 0 volts on insite and when I unplug vgt it won’t show any codes. Nothing at all coming up. Unplug and plug back in with no codes. Second when trying a hysteria test it comes back bad communication. I’m using a paccar adapter to get my insite to work so am thinking it could possibly be the j1939 being backwards is the problem. Any help with this problem would be greatly appreciated. Also no it was not my idea, not sure why he didn’t rebuild x15, just a problem I am now dealing with. Thanks in advance.