Hello Daniel,
I have the same issue with my Honda Civic EX 2012 and wonder if you found out what was the culprit? There is a service bulletin for such issue, PCM software must be updated to 3.10.40. I took my car to the dealer, they said I had the latest PCM software, battery and alternator are good and don’t know why my battery drained gradually if I’m driving with the headlights off.
Thanks.
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