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2008 P1121 Coolant Control Valve

Discussion in 'Gen 2 Prius Main Forum' started by GjP, Jun 19, 2017.

  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
     
    #1 GjP, Jun 19, 2017
    AltraStache likes this.
  2. JC91006

    JC91006 Senior Member

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    II
    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.
     
    #2 JC91006, Jun 19, 2017
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  3. m.wynn

    m.wynn Senior 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:

     
    #3 m.wynn, Jun 19, 2017
    AltraStache, M in KC, Raytheeagle and 1 other person like this.
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