Car rattles for 5 minutes before I start it.

welcome! i'm thinking one of the pumps. did you get any dash lights?

 

not always, but often, when there is a problem. the dealer will look for trouble codes. i've never heard of anything like you describe, but there is a hot water thermos pump that runs after you shut down, maybe it has a problem.

 

does the brake accumulator sound the same when you open the drivers door?

 

amazing. sounds like something is running that shouldn't be, there has to be a trouble code, hopefully.

 

Its probably the CHRS pump. Coolant heat recovery system. It will do it from now on till repaired. Its located behind the drivers side headlight at the bottom of the fender. Where the fender meets the bumper. Pretty common mine just started squawking in my 07 100K car too.
It won't hurt anything but it makes some weird sounds.

Btw, don't bother going to the dealer for an inspection because if there's no check engine lights on the dash or the mfd there's no codes to be harvested and going to the dealer on this investigation is a really quick way to lose $140. and come away with alot of shrugs.

Just to be sure pinpoint it next time it does it under the hood. Look and listen where I said.

 

Mine makes a really weird eek-oink noise. Don't bother with a video there's alot of posts about it. Very common. Many many threads about it search "CHRS"

Go to the top of this page find SEARCH FORUMS click on that and enter CHRS on the top line that says KEYWORDS.

Lots of reading.

 

With the car in Ready mode, try stepping on the brake and holding it for a couple seconds, step and release a couple times. If you can make that "jackhammer" sound, it's just your electronic brakes.....getting louder. If there was a problem with the system (like losing pressure), you would get warning lights on your dash.

 

This is my guess. You say the noise was happening as you approached the car, and before you turned it on? Normally this pump turns on every couple of times the brake pedal is pressed, and is normally a quiet ratcheting sound. When it fails, it will run much more often, even when the car is turned off. The level of noise you describe is very unusual.

The pump is located on the passenger side of the firewall in the engine room. The pump was recently covered in an extended/enhanced warranty offer, so be sure to document what's happening.

 

The Prius and all her sounds

Most of the time its the brakepump or Inverterpump
Brakepump sould be noisy inverterpump doesn't
Just check for codes...thats almost always the first step to do when you think you have problems

 

Chrs

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