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This will be long, but please bear with me. My son's 2007 Cobalt LT 2.2 blew its head head gasket, got hot, junked engine. Found a complete donor car, 2006 Cobalt. I know that the engines are different but replaced the engine, all harness's and computers from donor car.

OBD says no communication, car won't crank. I can get it to crank and run for about 5 seconds by removing the crank relay and jumping the terminals. Gauges don't register and the DIC says power steering and air bag. I have the 5v reference. i think i have checked everything I can find online, but sure I am missing something.

Any help would be greatly appreciated! I'm sure, or at least hopeful, that it is something simple I am overlooking.
 
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