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The "Cleaning Exhaust Filter" message flashes on the display for about 2 seconds and then goes away. It's very easy to miss. There are no other message that pop up unless the DPF is so full it displays "Drive to Clean Exhaust" That occurs if the engine conditions never allow a regen to start, like coolant never reaching 160F or repeated regen interruptions, and soot continues to accumulate above normal regen trip point.. In that case, "Cleaning Exhaust filter" supposedly stays on until it's done.
I know when exactly mine goes into regen from the sounds of the engine, but it's easy to miss on the freeway since road noise drowns it out. Boost drops rapidly to zero when regens are active.
You can check for regen by pressing the system info and wait until it scrolls to the end of all the messages. If it's in regen, it'll say 'Cleaning Exhaust Filter" just before it displays the odo.
Mine will regen approx every 250-275miles. It'll feel real constipated just before regens.
I calculated about 1-2gallons of diesel are burned per full regen or about a 5-6% fuel penalty; less on freeway, more in stop-and-go traffic. Stupid DPF and regens are the source of all evil in this truck!!
Last edited by unbahlievable; 03-19-2012 at 08:49 PM.