2008 P1121 Coolant Control Valve

Discussion in 'Gen 2 Prius Main Forum' started by GjP, Jun 19, 2017 at 1:25 PM.

  1. GjP

    GjP Junior Member

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    My daughter has a 2008 Prius (2nd Gen ?) with 103,000 miles.

    We got the P1121 code for coolant control valve. Had it replaced and all was fine for a week. Code reappeared. Mechanic said unit was bad and replaced it again. 2 weeks later code is back. Any thoughts/suggestions would be greatly appreciated.
    Otherwise car runs great.

    Thanks
     
  2. JC91006

    JC91006 Senior Member

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    Is the mechanic using OEM parts from Toyota? Does your heater work? The mechanic should check the coolant level to make sure there's enough coolant in the system.
     
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  3. m.wynn

    m.wynn Active Member

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    The engine coolant loop is a somewhat tedious fill and bleed in the Gen 2 Prius. If the mechanic does not have prior Prius experience, there's a good chance the loop isn't full to capacity or fully bled. This 2 part instructional video pretty much nails it:

     
    M in KC, Raytheeagle and Ajourney101 like this.
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