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  1. S

    p0400

    So this code has been coming in and out intermittently, primarily in the morning when vehicle is started. After a few start ups the code goes away in the afternoon it almost seems that when the engine warms up the code seems to go away. The EGR valve has already been replaced, also the MAF has...
  2. S

    p0400 EGR code

    the reading during idle was .04lbs/s looks normal
  3. S

    p0400 EGR code

    Air flow rate from mass air flow sensor at time of code was 0.08lb/s
  4. S

    p0400 EGR code

    The crazy thing is the check engine light goes in the afternoon when I go home from work. I noticed when the temp is above 55 deg it’s warmer and the light goes off
  5. S

    p0400 EGR code

    Yes I have an AUTEL scan tool that I can use to see the live data
  6. S

    p0400 EGR code

    2016 LML 6.6
  7. S

    p0400 EGR code

    2016 LML DURAMAX 6.6
  8. S

    p0400 EGR code

    no dry
  9. S

    p0400 EGR code

    I am running an after market air filter which is about 8months old now. The MAF sensor was replaced about 3 months ago
  10. S

    p0400 EGR code

    I am running an after market air filter which is about 8months old now. The MAF sensor was replaced about 3 months ago
  11. S

    New to the Forum

    I have a 2016 Duramax that I am trying to get repaired any help would be greatly appreciated.
  12. S

    p0400 EGR code

    I have recently replaced the EGR valve on the vehicle and the code went away for about a month. Here recently the code came back on when I first started the vehicle up in the morning. This time the reduced power came on along with the same code p0400, what's weird is in the afternoon when I'm...
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