Both Check Engine light and Stop engine light came on today; I had them checked at the local Cummins/Freightliner shop and the fault codes were as follows: CM850, 0235 (red dot-active), 0197 (yellow dot-active), 2962 (yellow dot-inactive), and 2961 (yellow dot-inactive). So driving it home from the shop, it started dribbling radiator fluid out the right side of the engine. This is in a 2006 Tiffin Allegro Bay, 34', with a Cummins 300hp, engine and freightliner frame. So Before taking it back to the shop for reparis, I added water to the radiator, and in the drive to the shop, neither light came on! However, it has a pretty good leak in the cooling system on the passenger side of the engine. So maybe, the EGR isn't the culprit - maybe the temperature in the EGR is the culprit because the coolant was low. Maybe?
Ed Herbert