If Gm has a read out on the Msg center it will tell you that."regeneration is in progress" (Ford) Otherwise it is difficult to tell if you are in Regeneration. We have a after market gage that reads pre turbo and there is a huge increase in pre turbo EGT. There is also a slight drop in MPG 2mpg or more. The regeneration on our 08 Ford is pretty much transparent and I would not know it was in progress if I did not see the MSG or saw the high EGT.
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