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386, check engine when brake pressed

Discussion in 'Peterbilt Forum' started by broc, Aug 31, 2017.

  1. Aug 31, 2017 #1
    broc

    broc Bobtail Member

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    Aug 31, 2017
    0
    I have 2007 386 with C15. Check engine light comes on when brake pedal pressed. Goes out when let up on it. Hand brake does th same thing and the brake lights come on when brakes are used. Just had a new engine harness put on and a rebuilt ECM. The check engine problem started after that. Does anybody have some ideas?
     
    broc, Aug 31, 2017
    broc, Aug 31, 2017
    #1
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  3. Sep 1, 2017 #2
    nasriza

    nasriza Road Train Member

    2,368
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    Feb 1, 2013
    Chicago, IL
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    maybe some paramater in your ecm is not changed i know n14 for example everytime i install a rebuilt ecm always i have to program the parameter for engine fan and tell it that there is no fan switch otherwise it will always run no matter what
     
    nasriza, Sep 1, 2017
    nasriza, Sep 1, 2017
    #2
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