P1121: Prius Coolant Inverter Pump after fixing Coolant Control Valve

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Symanx00, Nov 17, 2022.

  1. Symanx00

    Symanx00 New Member

    Joined:
    Nov 17, 2022
    1
    0
    0
    Location:
    30340
    Vehicle:
    2008 Prius
    Model:
    Two
    Hey friends,

    I have a 2008 Prius with about 107K miles on it. I have had my check engine light come on with P1121 code. I have been leaking coolant consistently for a week or so now. I had the Coolant Control Valve replaced about 3 months ago and the Coolant Inverter Water Pump replaced about 2 years ago (OEM). I took the vehicle to my mechanic and he told me that the water pump was broken. However, I am not seeing a code for any issue with the water pump as I did a couple of years ago. I am only seeing the P1121 code that says there is something wrong with the coolant control valve I just had replaced in August. Seeing if anyone has had a similar experience, and if so, what do you recommend.

    Simon
     
    #1 Symanx00, Nov 17, 2022
  2. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    2,458
    992
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Any coolant pump can leak- that has nothing to do with any codes (at least until the system gets too low and something overheats). Which pump is it? Belt driven engine pump? Inverter pump? Heater pump? Coolant heat tank pump?

    90 + percent of the time, a P1121 is the result of a fault in the coolant control valve. There's a slight possibility that the connector or wiring is bad, or something in the system is restricted. I think there has been a case where two hoses on the valve were incorrectly swapped.

    What brand of valve was installed? In general I only recommend OE Toyota from a reputable source. Aftermarket parts can/have caused too many problems for me to consider using them for things like this

    Posted via the PriusChat mobile app.
     
    #2 mr_guy_mann, Nov 17, 2022
(You must log in or sign up to post here.)
Loading...
Similar Threads - P1121 Prius Coolant
  1. bugaboo416

    PDF for 2009 Prius - P1121 Coolant Control valve replacement and ICE coolant replacement

    bugaboo416, Nov 11, 2019, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    0
    Views:
    1,081
    bugaboo416
    Nov 11, 2019
  2. prius05_owner

    Prius error code (P1116) after replacing coolant inverter pump

    prius05_owner, Sep 8, 2018, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    6
    Views:
    13,251
    Mahal
    Nov 15, 2021
  3. Jeff in NC

    No Cabin Heat After Coolant Flow Control Valve Replaced, 2008

    Jeff in NC, Jul 6, 2018, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    7
    Views:
    6,146
    ChapmanF
    Dec 27, 2021
  4. antwon3008

    HELP engine codes on (2005 Prius)

    antwon3008, Jun 2, 2018, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    3
    Views:
    3,365
    Cammac
    Jun 27, 2019
  5. spyogenes

    2004 Prius with 350k and a handful of error codes

    spyogenes, May 29, 2018, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    1
    Views:
    1,834
    Kon_rouge
    Aug 23, 2019