21B055/21B056 codes

Discussion in 'Issues, Warranty, Recalls, TSB' started by Toyotawild, Mar 26, 2020.

  1. Toyotawild

    Toyotawild Well-Known Member

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    21B056 - radiator lower valve coms fault 21B055 - radiator upper valve coms fault. What does this mean and how do I fix it lol
     
  2. Guff

    Guff Moderator
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    #2 Mar 27, 2020
    Last edited: Mar 27, 2020
    What were you doing when it happened? Is your car stock? What was the ambient temp? More info the better!

    Only other instance I've seen this in this forum is here and he just cleared it and it went away. Not saying it'll be the same though.
     
  3. larrymz3

    larrymz3 Well-Known Member

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    I get the same codes. MHD tune with 1.5 OTS map and downpipe.
     
  4. OP
    OP
    Toyotawild

    Toyotawild Well-Known Member

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    Zach
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    Thanks all is normal it's an mhd thing
     
  5. larrymz3

    larrymz3 Well-Known Member

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    How do you know this? I've reached out to MHD and have yet to get a response.
     
  6. SilverSupra

    SilverSupra Active Member

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    I have these codes as well, did anyone get a official confirmation with Mhd?
     
  7. larrymz3

    larrymz3 Well-Known Member

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