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I have 33k on mine and it's only did 2 or 3 regens at the 250 to 300 mile mark. Most all the time its 24 engine hours or 650 to 750 miles. I would definitely suspect a problem however the dealerships unfortunately are only trained for check engine code related problems. No codes no problem...
not stepping on anyone's toes but I dont think this info is correct.. In my experience hydra boost power assist brakes like found on the hd diesel pickups 3/4 ton up is solely ran from the pressure from the power steering pump.
vacuum over hyd systems are 1/2 ton pickup and down vehicles or gas...
A/c compressor it seems on mine. mine does it once the temp in the cabin has cooled off and the compressor cycles on and off to maintain temp. That's when I notice it.
My truck regens about every 650 to 750 miles. The gauge usually says the filter is low , first mark on gauge or nothing at all. I drive 35 miles to work 1 way so about every 10 days or so. Bought the truck 7/20 and now have 26k on her.
Well service advisor looked at the paperwork today right before closing for 30 seconds and said Ill order the parts on Monday Fyi!! problem solved Thanks