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2004 Chevy Tahoe 2WD 5.3 Flex
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My Silverado has been experiencing sporadic issues with power door locks, mirrors, alarm system, etc. I ignore it due to being sporadic. I bought a scanner that does deeper probing and it is telling me my BCM needs replacing. Never heard of such thing but now do. New unit $200 minimum.

Does anyone have experience with using these from a junkyard pull?
 

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As red says, any replacement, new, or junkyard, will need to be flashed to your VIN, at least a 1 hr charge.

The BCM hardly ever has intermittent issues, if a component fails, it fails.
You could have a crack on a circuit board that could be intermittent; but I'd look elsewhere.
Check the condition of the BCM connector and check the condition of the BCM grounds
 
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