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2009 P1121 Error

Discussion in 'Gen 2 Prius Technical Discussion' started by labans, May 4, 2020.

  1. labans

    labans Junior Member

    Joined:
    May 4, 2020
    3
    2
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    Location:
    texas
    Vehicle:
    2009 Prius
    Model:
    N/A
    DTC P1121. Inverter Coolant Control Valve
    Car has 296,455 miles.
    18 months ago we replaced this valve to clear the P1121 code, which it did. Ran fine up until this month.
    Has anyone had this issue? What I mean is, the. first valve lasted over 290,000 miles and the second one
    maybe less than 15,000 miles.
    OR---am I missing some other possibility?
    When I check the coolant in the overflow container I can see the fluid moving along at a quick pace. Car drives completely normally. Problem is that it will not pass inspection with this error code set.
    I have ordered another valve in the meantime but have trouble believing the valve only lasted 18 months.
    Need some ideas, please!!
     
    #1 labans, May 4, 2020
  2. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    5,302
    4,241
    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    #2 SFO, May 5, 2020
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