Twice in the last 6 weeks has my battery completely drained on my 2020 Mazda 3… engine is off, lights are off, no obvious culprit… has anybody else experienced this? any idea what might be causing this?
You have a faulty new battery or a parasitic drain. Trunk or glove box light not shutting off or other accessory nit shutting off. A shop can attempt to find it if not intermittent or you can google to see a whole host of diy advice.
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Type “parasitic drain testing” in Google or on YouTube. Something in your car is not “going to sleep” when you turn it off. Or your new battery is faulty… have it tested, too.
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Did you replace your old battery for the same reason??
It seems like it’s an occasional problem. It occurs every three weeks or so. What is similar about the times it happens? Did you leave something plugged into a USB port for instance? If you can make it happen you will know what it is.
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There is a service campaign for 2019-2021 Mazda3 to address a problem with the Climate Control Unit and the Body Control Module causing a battery discharge.
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