Has anyone else had the P2002 engine code (Diesel Particulate Filter Efficiency Below Threshold B1)? My 2014 GC Diesel has had this error popping up for a while. I manually clear it, since during a regen it's suppose to burn off buildup, but the code seems to return. New DPF is ~$3k. At 57k miles its out of warranty, but if I need to replace it I may buy an extended warranty. Rear lift gate won't stay up any longer either after it opens, so another reason I'm eyeing an extended warranty...