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If a BCM is swapped with another in different part number, what may occur for the vehicle itself?
I don't know the answer - but I will say that with any swap, the VIN will likely need to be re-programmed. The BCM checks it's VIN against the VIN in other modules. If they don't match, you'll have a no-start condition.

I think my biggest concern with changing out a BCM without some parts manual's blessing is that some BCMs may not have all the inputs or outputs needed. When you're making millions of cars, leaving out a 3¢ transistor that's not used adds up to real money. However, the "replacement" BCM may have all the parts is it's cheaper to have "full" units in stock that work on any GM car than to try and mange spares for each variant.
 

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does anyone repair Cruze BCMs? Where can I get a used BCM reprogrammed cheap? Also, is there a chip that can be taken from the old BCM and put onto the used BCM?
Good question. I don't think too many have taken their BCM apart.

I'd start calling around to dealers and mechanics to see what they can do to help you out. They may not want to work with a part you source, since it reflects badly on them if it fails. However, they may have their own source for used parts.

GM Parts Direct indicates that they have new ones for $150, but of course it will need to be programmed. I'm seeing another place advertising $225 repair service. That might be the cheapest total cost if you can't find a cooperative local mechanic.
 
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