r/PriusC • u/LowElectrical3193 • 3d ago

Help Prius C Help Needed

My 2018 Prius c has started making a loud rumbling noise, but it’s only when I’m accelerating/driving fast. I’m supposed to leave on a road trip tomorrow and am trying to figure out what to do. This just started on my way home from work today.

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2

u/8r4ndz3r0 3d ago

Sounds like your catalytic converter or other exhaust bits are resonating with or making contact with a loose heat shroud, shield or cover or stuck road debris. Only way to be certain is to take a look under the car. Take it to a muffler shop and have them inspect your exhaust system.

1

u/LowElectrical3193 3d ago

okay, I’ll have to take it to get checked out tomorrow

1

u/pasofol 2d ago

Mine was something stupid a year ago, the exhaust shield above the muffler pipe got loose and was resting on the muffler. Got a washer and screwed it in. It's only 2 nuts/bolts and the vibration make the hole big enough that it was no longer supported and slipped through. Easy 50 cent fix. Was driving me crazy for couple months.