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Exhaust Manifold leak vs P0402 code HELP

Discussion in 'Technical Chat' started by dustinclm, Jan 2, 2011.

  1. Jan 2, 2011 at 9:36 PM
    #1
    dustinclm

    dustinclm [OP] Well-Known Member

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    Thibodaux, La
    Vehicle:
    2012 Super White DC 4x4 V6
    Bilstein 5100 set at .85" WeatherTech Floor Mats
    Can anyone tell me if a cracked exhaust manifold can trigger the P0402 code? the P0402 code is this.....
    P0402 - system fault exhaust gas recirculation - too much flow on EGR
    1) EGR valve stuck open
    2) failed EGR pressure sensor, or valve or pressure sensor

    .....or should i check the EGR valve and lines? if i need to check the valve or lines, what is the best do that? i know where they are located and ran seafoam through the motor. I am not positive the manifold is cracked but i can hear a "puffing" noise when driving and can not find a leak anywhere else so im assuming its a manifold leak but i do not smell any fumes or have other symptoms besides the "puffing". the manifold is covered by a heat shield and i cant remove the nuts of the shield because they are rusted on there pretty good. Or am i looking at two different problems?

    thanks
     
  2. Feb 9, 2011 at 8:42 PM
    #2
    The Munster

    The Munster I like turtles!!!

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    Moody AFB, GA
    does your engine run rough at idle? if no then your egr is not stuck open... check the egr modulator
     
  3. Feb 10, 2011 at 10:10 AM
    #3
    dustinclm

    dustinclm [OP] Well-Known Member

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    Vehicle:
    2012 Super White DC 4x4 V6
    Bilstein 5100 set at .85" WeatherTech Floor Mats
    no, my truck runs really well, i would never know anything is wrong if it wasnt for the CEL. where is the modulator?
     
  4. Feb 10, 2011 at 8:09 PM
    #4
    The Munster

    The Munster I like turtles!!!

    Joined:
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    Lance
    Moody AFB, GA
    its this little plastic circular thing right next to or close to the egr valve
     
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