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Hey, I’m new to the forums. Got a g6 I’m working on for a customer. It initially had an issue not cranking/starting. Hooked up an obd scanner and I got u0100 code lost communication to pcm. I bought a rebuilt ecu and programmed keys now it cranks but still won’t start. I checked 5 volt reference and power/ground connections all seem fine. Any ideas? Also I’m now getting a number of codes which seems weird to me. ( p0621,p0010,p0107,p0122,p0223,p0443)
 

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The PCM has to be programmed to the vehicle and a number of variables need to be relearned. It's not just plug and play.
 

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Something similar happened with my 2008 Malibu LS 3.5, there was a problem with the fuse box on the engine bay. The car would start when cold or colder weather, but as soon as the engine bay got warmer it would not crank or start. Had to replace the whole fuse box to fix the problem.
 
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