Help: "Reduced Engine Power" fault code

[Durabark]

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 sit for 1-2 minutes. After sitting, I restart the truck and go on my way like nothing happened until it happens again. When it restarts the error message says "change fuel filter" Any Clues ??? it's the greatest except for this.

 

[andy-stevenson]

Almost sounds like it's losing rail pressure. Is your truck tuned? Sounds like the fuel rail plug.

 

[Awenta]

How's the dpf

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[Durabark]

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.

 

[duramaxdiesel]

I had that happen on my LMM. It ended up being a dirty air filter believe it or not. Replaced it and problem went away.