P0475 exhaust bypass valve malfunction | FerrariChat
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P0475 exhaust bypass valve malfunction

Discussion in 'Technical Q&A' started by 575M Student, Sep 22, 2023.

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  1. 575M Student

    575M Student Rookie

    Aug 31, 2023
    16
    SW FLORIDA
    Full Name:
    Patrick
    #1 575M Student, Sep 22, 2023
    Hello all. I am getting this consistently repeated code on my 2003 575M. The exhaust appears all original. Where to start? Computer says the position is "closed."

    Thank you all so much in advance!
     
  2. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,019
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    #2 tazandjan, Sep 22, 2023
    Likely a vacuum leak from one of the hoses. On 575Ms the exhaust bypass valves are fail closed, so a hose or the solenoid. Solenoid gets its signal from the Motronic ECUs. Note those valves are always closed until you reach the schedule that tells them to open.

    Activation thresholds: From 1000 to 2720 rpm CLOSED. From 2720 rpm and loaded >64% OPEN.
     
  3. RayJohns

    RayJohns F1 Veteran
    Silver Subscribed

    May 21, 2006
    7,808
    West Coast
    Full Name:
    Ray
    #3 RayJohns, Sep 23, 2023
    Try resetting the ECU also. I once had my 360 or maybe it was the 458 get confused as to which was open vs. closed. Reset the ECU and it solved the issue. Worth a try.

    Ray
     
  4. 575M Student

    575M Student Rookie

    Aug 31, 2023
    16
    SW FLORIDA
    Full Name:
    Patrick
    #4 575M Student, Sep 23, 2023
    Thank you all! I traced the vacuum hose back to the solenoid. Someone installed Tubi's (yea!) but left simply the lone vacuum hose plugged into the solenoid with the other barb wide open. The electonic sensor was unplugged.

    So capped the open solenoid barb, plugged it back in, no more code.

    New used car, and its the first no code, no engine light day for me. Celebration time!

    Thank you.
     
    RayJohns likes this.
  5. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,019
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    #5 tazandjan, Sep 23, 2023
    Now get out an enjoy driving her.

    Next time post in the 456/550/575 thread and you will get help faster.
     

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