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Search results

  1. dgleason

    P0403 on an '06 LLY

    Took my truck in this morning for an ECM software upgrade. Service manager told me that is the starting point. Was told the tech believes that an ECM update wouldn't help and the EGR valve needs replacement. The dealer had 3 of the 4 gaskets needed, going back tomorrow morning for the EGR...
  2. dgleason

    New member

    Hi all, I came across this site while searching for a duramax P0403 code. Appears there is a lot to learn on this site, great site for a new diesel owner. I picked up a '06 Chev LT crew cab 2500HD with the LLY duramax and allison trans. for towing an RV a year ago. The truck had 41K when I...
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