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  1. Duramax First Generation: 2001-2004 (LB7)
    My 01 3500 LB7 will go into limp mode when towing. It has to be sort of a long hill. I need about 10 seconds up hill with at least an empty gooseneck trailer. I did catch a code months back, P0234 overboost. But it rarely throws a code when it goes into limp mode. I finally got a pillar...
  2. Duramax First Generation: 2001-2004 (LB7)
    What are the cause(s) that generate code P0234 ?
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