Loss of coolant 2017 prius, headgasket??

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Adrenaline, Aug 3, 2022.

  1. Adrenaline

    Adrenaline New Member

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    Hi guys I'm new on here, I have a 2017 prius hybrid, recently I have noticed that I have to regularly top up the coolant, I have taken it to several garages but no coolant leaks can be found. The car has done 115k miles. Any advice where I should be looking? And does the headgasket fail on these cars?
     
  2. bisco

    bisco cookie crumbler

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    welcome!
    it's usually at the exhaust coolant heater loop. i think there is a tsb or extended warranty. call a dealer, or log on to toyota.com/owners
     
  3. RRxing

    RRxing Senior Member

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    This USA TSB might not cover you due to the mileage limit, but it might. Search to see if there is a Canadian version of this TSB. Good Luck.

    I had this occur on my 2017 Three Touring. It was the exhaust coolant heat exchanger. Took a while for the parts to come in, but was fixed under warranty.

    See attached...
     

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    #3 RRxing, Aug 4, 2022
    Last edited: Aug 4, 2022
  4. GregersonIT

    GregersonIT Member

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    Are you sure it's the coolant you keep refilling? Or the washer fluid? If it's the coolant, I'd suspect someone never changed the fluid and would probably take a really close look at the water pump. The worse case scenario would be the head gasket. But you should see telltale signs of that, white smoke in the tailpipe especially after start, milky oil, etc.
     
  5. 2010moneypit?

    2010moneypit? Member

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    What bisco said.
    Very common
     
  6. Adrenaline

    Adrenaline New Member

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    Thank you for your response guys, I've been running out of ideas and there is no sludge under oil cap, and it is deffo the radiator expansion tank.
     
  7. bisco

    bisco cookie crumbler

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    please let us know the dealers response
     
  8. MikeDee

    MikeDee Senior Member

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    Did they do a pressure test?
     
  9. GregersonIT

    GregersonIT Member

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    I can see the exchanger at the throttle body being a source of a leak and hard to find as well.
     
  10. barry mullinax

    barry mullinax Junior Member

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    See TSB T-SB-0135-19 - I didn't know I was losing coolant. it was an internal leak and fried the engine. NO WARNINGS Nothing the car just lost power. It gave me a "Hybrid System Stopped Steering Power Low" right after I suddenly lost power as I turned into a parking lot. I had it towed to my house, hooked up an OB scanner, got a P3190, and replaced 12V battery with no change. The dealership has it now installing an engine, water pump and exhaust to the tune of $10200.00 The car has been very well maintained since new. All servicing has been done at Toyota, where I bought new in 2016. The car gave no warnings whatsoever. I suddenly started losing power and then displayed "Hybrid System Stopped Steering Power Low" and "contact the dealership". You would think if the car was low on coolant or out, the car would give you a notification (IDIOT Light) that the car was getting hot.
     
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  11. barry mullinax

    barry mullinax Junior Member

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    See TSB T-SB-0135-19 - I didn't know I was losing coolant. it was an internal leak and fried the engine. NO WARNINGS Nothing the car just lost power. It gave me a "Hybrid System Stopped Steering Power Low" right after I suddenly lost power as I turned into a parking lot. I had it towed to my house, hooked up an OB scanner, got a P3190, and replaced 12V battery with no change. The dealership has it now installing an engine, water pump and exhaust to the tune of $10200.00 The car has been very well maintained since new. All servicing has been done at Toyota, where I bought new in 2016. The car gave no warnings whatsoever. I suddenly started losing power and then displayed "Hybrid System Stopped Steering Power Low" and "contact the dealership". You would think if the car was low on coolant or out, the car would give you a notification (IDIOT Light) that the car was getting hot. have dealership check the part number on the exhaust
     
  12. Mendel Leisk

    Mendel Leisk Underfoot

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    I remember driving DIL's Sunfire to Costco for tire repair, looking at the dash, muttering "Even this POS has a temp gauge"...:rolleyes:
     
  13. GregersonIT

    GregersonIT Member

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    Sounds like the head gasket failed, likely due to manufacturing defect. Reduction of power would be it getting hot or the coolant mucking up the bearings on the crankshaft and or both. Eventually, engine will fail in such a scenario.
     
  14. dacoobob

    dacoobob Junior Member

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    it was the exhaust heat exchanger causing the "internal leak", not the head gasket.
     
  15. Mendel Leisk

    Mendel Leisk Underfoot

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    It might be?
     
  16. dacoobob

    dacoobob Junior Member

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    the poster referenced TSB T-SB-0135-19, which is the one about exhaust heat exchanger failure.
     
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  17. douglasjre

    douglasjre Senior Member

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    Do diagnostics=No diagnosis
     
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