Well, less than 400 miles on the car, and one week... and CEL on. OnStar says the car reports P2002 (but they don't clearly specify what that is, other then powertrain/emissions). A simple online search shows the title, DPF.. hard to imagine a DPF failure this soon.. perhaps a sensor. The dealership has the car now, I will post follow ups as I get them. Most likely not related.. seems I get a puddle under the car.. suspect DEF leak, because it appears as water, but does not dry up like other water puddles from condensation from other cars.. Have the dealer looking at that too while its there. Hoping for an easy fix here.. Anyone else have similar issues from new?