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Random battery drain

seewbrown

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seewbrown New Member

seewbrown

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Have an '04 Sierra 1500 5.3 that will very randomly drain the battery overnight about once a month. No lights or radio being left on that I can tell. Keys not left in ignition. Local mechanic could not diagnose it. I'm getting these codes: B3770, B1025, B1045, B1055. Those are airflow control #6 a/c feedback circuit and then speaker error codes as far as I can tell. Thanks for any suggestions.

 

 

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