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What they do at the dealer is this, they hook up a computer and check to see if your system is in good shape, then they clear the fault. Which in turn, will clear your light. It is similar to the check engine light. I recommend that you get for your self a scanner (small computer) for your cummins engine, which you can find advertised in any Diesel Power magazine. I think they are made by Banks Diesel and Predator. That way when issues like this come up, you can do the reset yourself.NOTE: after so many miles, that particulate filter is supposed to get change out, or else your light might come back.
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The light on the dash was stop engine red light. the code is 3251. My scan tool would not let me remove that code.
What type of engine oil and what type of diesel fuel do you use?
Because with this engine being a 2009, it requires you to use low ash engine oil that meets CES20081 standards. Same with the fuel, it requires Ultra Low Sulfer Diesel only or bio-diesel fuel. You cant use the regular number 2 diesel. Failure to use this oil or fuel will result in serious damage to the exhaust after treatment system (particulate filter) or engine.
Since your engine is the latest and greatest, i could not find a code definition. Try to repost your question using the code number.Maybe someone else can answer that.