Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Your vehicles BCM (body control module) controls the power locks with the remote and interior locking buttons.If the BCM has an internal electrical failure this can cause issues with the battery drain here as well as the locks working with the remote or interior buttons.I have seen the BCM fail on this model quite a but in the past before needing replaced to correct this fault here.I would have a battery drain/draw test done to help locate the source of the drain then from there the fault codes checked as well to see what codes are set to see if this all leads to a faulty BCM needing replaced.
When it is replaced it has to be replaced with a new one and has to be programmed by a GM dealer with their computer in order to work in your model here properly.
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