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    Help: "Reduced Engine Power" fault code

    It has had the PDF deleted. As to "has it been tuned"; I'm not sure, it has a K&N filter setup and twin 4 inch exhaust pipes and it wails a good bit more than a standard truck so I'd say it probably has been tuned.
  2. D

    Help: "Reduced Engine Power" fault code

    I just got a 2008 1 Ton Dually with Duramax & Allison, 150k miles. After driving for an hour or so on the interstate, if I have to hit it I sometimes get the fault message "engine power reduced" and the engine power goes down by half and I pull over & stop. I shut the ignition totally off and...
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