Mhobizal

I have a 2014 Lexus ES300h. I just started noticing that after 2 to 4 hours after turning the car was turned off, I am finding what sounds like the electric motor running. There is a buzzing sound. I can turn the car back on for a few mins and then back off, the electric buzzing sound goes away.

Since owning the car, I've never found the car buzzing. It sounds like the electric motor is charging the batteries. Do I need to have this checked? I have 28k miles on my car and have never had an issue.

Freds430

This noise is just not in the hybrid. My wife's 2010 and 2015Rx made the same noise. Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. This is the sound of a fuel evaporation leakage check and, it does not indicate a malfunction.
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TechNut

Yup. Perfectly normal for a hybrid. I suspect you just weren't around it at the right time previously or you would have heard it.