turbo low boost p0299

  1. duramax400ci

    Stock Turbo HELP!!!!

    ive been getting the p0299 code and ive noticed that the boost gauge doesn't go any where near the 20 or so psi that that the stock tune should do. it only goes to about 16 psi of boost. ive also noticed its like the frist time i go WOT it will push the right amount of boost but after that its...
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