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Generally, regen starts at normal operating temps and you need a sustained operation speed of about 55 mph or better for 20 to 30 minutes to start and complete a regen. If you do not complete the cycle it will start over on older vehicles, I know that the 2013 will pick up where it left off when temps and speed are met again. If you don't do a regen within a specific time frame(pressures are monitored on both sides of filter) and pressure variance grows to great, the system will start defueling (very similar if it see excess EGT only for a much longer period, until pressure differential is corrected) and will eventually go into limp mode (You were seeing defueling). The new vehicles that operate DEF have no effect on the regen cycle, DEF is a totally separate operation system. You can delete the regen cycle(remove pollution regen chamber) and reprogram, also usually requires removal or by pass of EGR system. The removal does not increase power(but the tuner can be used to increase HP/torque), but does increase fuel mileage, because mileage drops significantly during regen. However any of these modifications will most likely void any remaining factory warranty on engine and transmission.
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