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Occasional CEL before ICE start, no stored codes

Discussion in 'Gen 2 Prius Main Forum' started by egg_salad, Aug 29, 2018.

  1. egg_salad

    egg_salad Active Member

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    This has happened twice now.

    In the brief interval between boot up and the ICE start, I've seen the Check Engine light. It's gone before I can get the Torque App running and connected to the ECU.

    No codes are stored.

    Thoughts?
     
    #1 egg_salad, Aug 29, 2018
  2. JC91006

    JC91006 Senior Member

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    There should be stored codes, I suspect it's your catalytic converter going bad or 3 way coolant valve going bad.

    If your car doesn't burn much oil, then it most likely would be the 3 way coolant valve
     
    #2 JC91006, Aug 29, 2018
    Last edited: Aug 29, 2018
  3. egg_salad

    egg_salad Active Member

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    Yes, I would like it very much if there were stored codes, but Torque reports none, and gives me a drive cycle complete.
     
    #3 egg_salad, Aug 29, 2018
  4. JC91006

    JC91006 Senior Member

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    I had a similar symptom on my 2008, the check engine light would go on and then turn itself off. It was my 3 way coolant valve, replaced under warranty (CA 15/150k)

    Check if your coolant is full, open the radiator cap and take a peak.
     
    #4 JC91006, Aug 29, 2018
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    This. Need Techstream? Dealership visit?
     
    #5 Mendel Leisk, Aug 29, 2018
  6. JC91006

    JC91006 Senior Member

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    When I run techstream, there always shows a "history" when a code was present. If the fault still exists, it goes to "current"
     
    #6 JC91006, Aug 29, 2018
    Mendel Leisk likes this.
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