Grinding sound in park in neutral

Under the hood there’s a distinct grinding sound only in park and neutral. It’s an automatic transmission. Fluid is fine. Can feel slight vibrations In the gear shifter but no slipping and the car drives fine. Maybe I’m crazy but I swear my gas mileage has gotten worse

Sounds like you should take it to a well rated auto repair shop near you.

You clearly are not going to DIY this since you didn’t even think to tell us the type of Honda or the year of the car or the mileage on it.

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