Car rattles for 5 minutes before I start it.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by mprius08, Dec 23, 2016.

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  1. mprius08

    mprius08 Junior Member

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    I had a very strange situation tonight. I have a 2008 Prius with about 68k miles. I was driving today for about an hour in stop in go traffic when I arrived at my destination. After about 30 minutes to an 1 hour I got back in my car and heard a rattling/rumbling/vibration sound similar to a jackhammer sound. I had not started the car at this point. The noise repeated every minute or so for about 5 minutes then stopped. Then after another 5 minutes or so it started the same cycle again. I looked under the hood to see if I could narrow down where the sound was coming from. It looked like the sound was coming from the silver hybrid synergy engine.

    This time after it stopped again I started the car with no issue and drove home.

    I called the dealership to explain this situation and they have never heard of it.

    Any ideas/suggestions?
     
    #1 mprius08, Dec 23, 2016
  2. bisco

    bisco cookie crumbler

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    welcome! i'm thinking one of the pumps. did you get any dash lights?
     
    #2 bisco, Dec 23, 2016
  3. mprius08

    mprius08 Junior Member

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    I did not see any dash lights. Is that something I should expect?
     
    #3 mprius08, Dec 23, 2016
  4. bisco

    bisco cookie crumbler

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    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.
     
    #4 bisco, Dec 23, 2016
  5. mprius08

    mprius08 Junior Member

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    That sounds like a starting point. I'm not looking forward to the dealer diagnostic charge just to check some codes.

    I really appreciate your responses. I will update if I find the issue or if anyone else has an idea. Thank you!
     
    #5 mprius08, Dec 23, 2016
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  6. bisco

    bisco cookie crumbler

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    does the brake accumulator sound the same when you open the drivers door?
     
    #6 bisco, Dec 23, 2016
  7. mprius08

    mprius08 Junior Member

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    I don't think so. I could hear the noise as I was walking to the car and when I got inside it was so loud I thought it was some sort of drilling outside. I sat in the car waiting for it to stop before I turned it on because I was so alarmed by it.
     
    #7 mprius08, Dec 23, 2016
  8. bisco

    bisco cookie crumbler

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    amazing. sounds like something is running that shouldn't be, there has to be a trouble code, hopefully.
     
    #8 bisco, Dec 23, 2016
  9. mprius08

    mprius08 Junior Member

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    Seemed like something was trying to start up/or stop like when you shut the car off.
     
    #9 mprius08, Dec 23, 2016
  10. edthefox5

    edthefox5 Senior Member

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    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.
     
    #10 edthefox5, Dec 23, 2016
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  11. mprius08

    mprius08 Junior Member

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    That makes sense. I will be on the lookout for this and will try to capture a video of it in case it happens to anyone else. At least now I have some ideas on where to start. Thank you!
     
    #11 mprius08, Dec 23, 2016
  12. edthefox5

    edthefox5 Senior Member

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    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.
     
    #12 edthefox5, Dec 23, 2016
  13. JC91006

    JC91006 Senior Member

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    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.
     
    #13 JC91006, Dec 23, 2016
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  14. mprius08

    mprius08 Junior Member

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    I will definitely give this a try. Thanks
     
    #14 mprius08, Dec 23, 2016
  15. andrewclaus

    andrewclaus Active Member

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    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.
     
    #15 andrewclaus, Dec 24, 2016
  16. b100

    b100 Member

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    The Prius and all her sounds :D

    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
     
    #16 b100, Dec 28, 2016
  17. TWOPrius

    TWOPrius Junior Member

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    #17 TWOPrius, Dec 29, 2016
  18. bisco

    bisco cookie crumbler

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    s,s,m,t,w,t...
     
    #18 bisco, Dec 29, 2016
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