Hey, and welcome to CumminsForum.
Maybe this little "diesel-dictionary" might help you out.
1.) EGR - "Exhaust Gas Recirculation". It allows some of your exhaust gas to be recycled back into your air intake to be re-burned. The only reason it's there, is because Dodge is a bunch of idiots, and they were trying to be the first diesel to pass the 2010 Emission Standards. That's why it's on there. Along with the DPF's and some other things.
2.) DPF - "Diesel Particulate Filter". Is a filter that traps, and burns-off microscopic pieces of particulate (exhaust debris, that the state of California (tree-hugging hippies), claim to be harmful), caused during combustion in a diesel engine.
3.) REGEN - "Regeneration Process". A process performed by all diesel vehicles equipped with a DPF (Diesel Particulate Filter). This process allows the injection of diesel fuel into the cylinders, during the off-stroke, which in turn causes more fuel to be burned, which in turn causes hotter combustion, which creates hotter EGT's (Exhaust Gas Temperatures), to get the DPF hot-enough to burn-off the particulate matter, that has been trapped in the screens inside of the DPF.
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2007.5 RAM 2500 Sport, Q/Cab, SWB, 4x4, 6.7L, 6-spd. auto, Flame Red, Line-X, Fabtech 6" long-arm kit, 38" x 15.50" Nitto Mud-Grapplers, 20" Helo's.
