Temp warning light turned on, turned off, then check hybrid system and engine lights turned on

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by SB6, Jun 27, 2020.

  1. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    Was driving at highway speeds for about an hour, when the coolant temperature warning light kicked on for a few seconds, then turned off. Then the check hybrid system and check engine lights turned on, as well as the orange triangle. Coolant temperature warning light is no longer on right now.

    Coolant reservoir seems to have spit coolant out, as the level seems to be near mid, and there's splashes of coolant around the reservoir. Engine oil level seems fine, as does the inverter coolant reservoir.

    Unfortunately, my cheap OBDII adapter is at home, not with me in the car right now. Same with my Chinese mini VCI cable
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    88,243
    39,379
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    bad waterpump maybe, or thermostat?
     
    SB6, AzusaPrius and Raytheeagle like this.
  3. Ed Beaty

    Ed Beaty Active Member

    Joined:
    Jul 13, 2018
    196
    208
    0
    Location:
    Salt Lake City
    Vehicle:
    2010 Prius
    Model:
    V
    "Coolant reservoir seems to have spit coolant out"

    I my experience, this does not happen (spitting coolant out) unless the reservoir cap is left OFF. If coolant level goes down (with cap on...) that could indicate head gasket issues. If the car has a lot of miles on it (>120k) you might look into the head gasket.
     
  4. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    10,216
    13,905
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    One of my former staff had this issue with his 2010 last year;).

    Ended up being the water pump and when disassembled, the impeller was rubbing against the chamber:cool:.

    His has 130k on it at the time of this event. Still running strong a year later and 15k more miles on it:).

    I'd start there(y).
     
  5. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    Did he just replace the pump? Or did he repair the pump somehow?
     
    #5 SB6, Jun 27, 2020
    Last edited: Jun 27, 2020
  6. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    10,216
    13,905
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Replaced the pump ;).

    No way to repair it:cool:.

    But get the codes read first, and go from there:).

    I have 2 old Gen3 water pumps at my house and there is noticeable resistance when compared to a new one, so when you get the codes and if it is the water pump, report back with a comparison(y).
     
  7. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    Was able to drive home. Coolant temperature warning didn't come back on. I see codes P261B Engine Coolant Pump "B" Control Malfunction and P0A0F-206 Engine Failed to Start. Not sure what the second one is about
     
  8. AzusaPrius

    AzusaPrius Member

    Joined:
    May 27, 2020
    316
    86
    0
    Location:
    Apple Valley
    Vehicle:
    2010 Prius
    Model:
    III
    That is your waterpump sir, go ahead and jump on your little puter and head towards Ebay and order yourself a waterpump. You can find them as cheap as $125 if you dont mind aftermarket. That is what I am using now and my issue is fixed.

    Posted via the PriusChat mobile app.
     
    SB6 likes this.
  9. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    That's what I figured... Anything I should check to make sure it's the pump, before ordering a new one?

    Also, it's the engine coolant pump, not the inverter pump right? Part 161A029015?

    I see there was a pump recall for the gen 2; there wasn't one for gen 3 was there?

    By the way, is it safe to drive the car short distances with a failed pump? Won't be able to do the replacement till next weekend, unfortunately
     
  10. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    2,255
    1,458
    0
    Location:
    Indian River County, Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    If you have techstream, you can test it. I "think" there are other apps that can, but don't know them.
     
    SB6 likes this.
  11. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    Are you able to provide more details? I do have a mini VCI cable and a "cracked" copy of Techstream, but I've never been able to get Techstream to work completely. For example, for a while I tried to mess around with smart key functions, but for some reason, I don't have the "Utilities" (I think that's what it was called?) button that I saw other people using when I looked stuff up online
     
  12. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    2,255
    1,458
    0
    Location:
    Indian River County, Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    I just know techstream is able to test it. HOW to get it working, sorry, can't help you there. :(
     
  13. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    I found it, it's under the Engine and ECT ECU tab > Active Test > Activate the Electric Water Pump.

    It lets me switch it between 0 and 3000 rpm. When I switch it to 3000 rpm, I hear a sort of humming noise. The noise goes away if I switch back to 0 rpm. Do I need to unbolt the pump from the car to physically see if it's working, or is there another way to tell?
     
  14. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    2,255
    1,458
    0
    Location:
    Indian River County, Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    I do not know. But I imagine that is there was a problem, it would say so.
    But hopefully someone will chime in that has experience with this.
     
  15. tankyuong

    tankyuong Senior Member

    Joined:
    Nov 9, 2012
    1,198
    504
    0
    Location:
    Central MO
    Vehicle:
    2010 Prius
    Model:
    III
    My coolant spat out when my head gasket was blown
     
    edthefox5 likes this.
  16. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    While that's a possibility, I feel like the pump is the issue in this case. I sat in the car with the car on yesterday, while I was figuring some stuff out for Techstream, and every minute or so, I could hear what I believe was the pump trying to turn on
     
  17. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    7,992
    3,536
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    head gasket blown.

    How well has the EGR issue been managed?

    Either way looks like it got very very over heated never good for an aluminum head engine.
     
    #17 edthefox5, Jun 28, 2020
    Last edited: Jun 28, 2020
  18. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    10,216
    13,905
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    One way to tell if the coolant is flowing is to see if the hoses get warm as the engine is running:).

    No way to see what the pump is doing, since it is a sealed pump:cool:.

    How many miles on it again:whistle:?

    The pump should be investigated first as this could be the cause before you go down the head gasket path;).

    Good luck and keep us posted (y).
     
    edthefox5 likes this.
  19. SB6

    SB6 Member

    Joined:
    Jan 27, 2019
    155
    29
    0
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    II
    150,000 miles on it now, with about 30,000 of that being under my ownership; I bought it from a private seller near 130,000 miles

    I haven't managed to do anything about the EGR issue yet, as I keep having other issues pop up, as my post history might indicate :(. I did supposedly get the EGR valve replaced for free at the dealership a year ago, though, after reporting hearing engine rattle on cold starts. I was already there for a different recall, I believe airbags?
     
  20. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    7,992
    3,536
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    hmmmm...thats not good.

    Whats the oil look like?
     
Loading...