Random battery drain

By seewbrown
May 25, 2016 in 1999-2013 Silverado 1500 & Sierra 1500

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seewbrown

Posted May 25, 2016

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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