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  1. #1
    Established Member Two Rings
    Join Date
    Jul 29 2015
    AZ Member #
    345726
    Location
    Chicagoland

    RS7 Fault code P0E77 Coolant Bypass Valve "A" Control Circuit High

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    I got check engine light on (it's actually went away) on my 2014 RS7.
    So I decided to check fault codes. Here's what it found:
    Fault code P0E77 Coolant Bypass Valve "A" Control Circuit High

    While there are some descriptions and reasons for the description, I can't seem to find that code anywhere.
    The description usually refers to some other code numbers.

    What do you guys think about it?
    Is it a thermostat problem as suggested by a dealer or is it unrelated or even temporary due to bad gasoline or something?
    Last edited by Obormot; 10-10-2018 at 01:05 PM. Reason: clarification

  2. #2
    Established Member Two Rings
    Join Date
    Jul 29 2015
    AZ Member #
    345726
    Location
    Chicagoland

    It's also strange that the code is grouped under sound system...

  3. #3
    Active Member Two Rings rey_reysA7's Avatar
    Join Date
    Sep 21 2018
    AZ Member #
    427250
    My Garage
    '84 VW GTi
    Location
    CO

    You have a stock ECM?
    I was a Volvo construction equipment mechanic and there was a ghost code that would come up on the loaders till an ECM update came out. Long shot but... A small posability....if it is some off the wall unknown

    Sent from my G8142 using Audizine mobile app
    Current Cars 2012 Audi A7 1984 VW Rabbit GTI
    Sold Cars '78 Rabbit '87 Scirocco '99.5 Jetta 2.0 '00 Jetta VR6

  4. #4
    Active Member Two Rings rey_reysA7's Avatar
    Join Date
    Sep 21 2018
    AZ Member #
    427250
    My Garage
    '84 VW GTi
    Location
    CO

    Quote Originally Posted by Obormot View Post
    It's also strange that the code is grouped under sound system...
    Just getting into these new audi's. What part tells you it's audio?

    Sent from my G8142 using Audizine mobile app
    Current Cars 2012 Audi A7 1984 VW Rabbit GTI
    Sold Cars '78 Rabbit '87 Scirocco '99.5 Jetta 2.0 '00 Jetta VR6

  5. #5
    Established Member Two Rings
    Join Date
    Jul 29 2015
    AZ Member #
    345726
    Location
    Chicagoland

    Quote Originally Posted by rey_reysA7 View Post
    Just getting into these new audi's. What part tells you it's audio?

    Sent from my G8142 using Audizine mobile app
    In the application the codes are grouped to different categories. This one is grouped under audio.



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