Knock on wood, I've never had that type of error error message appear on my '09. I know the Duramax LMM engine will go into reduction mode if the DPF becomes too clogged. However, this generally happens as a result of ignoring the warning message (and alarm) to run the truck for about a half-hour at 30+ mph to allow the engine to burn it off.
Personally, I agree with the previous poster. You might do better to post your problem on a Duramax diesel forum.
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2009 GMC Sierra 2500HD | Crew Cab | Standard Box | 4WD | Duramax/Allison
2000 Jayco Eagle 266 | FBS | TT
1986 Coleman Laramie pop-up -- Still in the family!!!
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