Good morning guys and gals. I have a 2010 Dodge Ram 3500 that is 100% stock. I replaced my transmission a couple of weeks ago, and keep getting a CEL with a P2453 DTC. My boss ran some tests on it, and found that the back pressure in the exhaust is nearly at 20psi. I think that sounds a bit high. I guess maybe it is time to delete and get it programmed. Can someone tell me for sure that this is a sign of my DPF being plugged up? Thanks for any help here.