Loud Buzzing when GX is off (with video evidence) (6 Viewers)

[Michael T]

I walked outside to take out my trash at 10:20 tonight. My car has been parked since I got home at 5:20. I heard a loud buzzing sound coming from the left rear end from under carriage of car. Gonna take to Lexus but has anyone else had weird buzzing like this when the car is OFF?

Video recording of it below.

 

[Michael T]

Here’s more of the video, i can only upload small snippets as the full videos i have are “too large to upload” so says this forum…

 

[Michael T]

Here’s 3rd video

 

[BoostedGX]

Not the compressor running right ? Edit nvm the compressor can only run with the truck on

 

[bronco21]

Most likely normal function of the EVAP system.

 

[cmfhsu]

Yep - that's the EVAP emissions leak detection pump (or whatever Toyota calls it). It runs a few hours after the car is shut off to check if the fuel and emissions systems have any leaks that could be leaking fuel vapors into the environment.

Thanks for posting a video! I never managed to catch my car running the cycle and I've never heard it before. The Car Care Nut has a video series about how Toyota EVAP systems work if you want to get really really nerdy.

 

[Capt CF]

Thanks for posting. I caught mine doing it once and I was mystified, but turned the truck on and off and it stopped. I figured if it happened again I would take it in. Good to know it's normal behavior.