It baffles me too as to why some see it and some dont. I bought a 17 new in April. Truck has 9400 miles never had a regen messageI am not understanding this discussion of never seeing that message. We take a vacation towing a 5000 lb trailer between 3000 and 5000 miles and I get the 80% regen notice at least twice each trip. I had an engine replaced at 30K miles and now have 54K and the new engine has had GDE tune on from the beginning. I know the GDE tune extended the time between the 80% regens.
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