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They don't do too much LB7 work anymore. But they still do know their stuff. Did you disable the VATS with the Yukon XL BCM in the vehicle? If not you need to do it. Get on alldata.com if you need some wiring. Probably should start with the cut wires and ohm them out to make sure you're getting a good ground.

Also you may need to check your wiring for the cam shaft sensor to ensure good connections. If the ECM doesn't know where the pistons are, then the engine isn't going to want to fire. If the circuit and performace is bad it could just possibly be one of those grounds.

Also this i don't know, but is there a sort of relearn that needs to be done after replacing that sensor?
 
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