Okay, so I was getting two codes, one on startup and the other on WOT long pulls along with a message in the message center that said, Engine Reduced Power. I called SCT today, and after 35 minutes on hold I am told that the tunes I am running for DPF delete are not theirs. I am told to contact the place I bought it from, witch was Rudy's Diesel Performance, so that is what I did. Turns out they use tunes from PIP (Punch it Performance), after hearing this I was a little concerned as the tune is not from SCT as I thought, till I did some research on PIP, and it looks like they have a good reputation in the diesel tuning industry. So, I called PIP, asked for Tech assistance, explained my issues and the tech (David) was very helpful and asked what tune setting I was running and if there was a revision number after the tune name and I replied no. He then asked If I would email him the serial number of my SCT X4 and note that it needs updated to the latest revision for a '15 6.7 Super duty. So while I was stopped at the store parking lot I was calling him from, I sent him the email and within 15 minutes I had the revision, witch is number 6. I installed it on the programmer and then to the truck a little while ago. I will test it in the morning. Pretty good customer service if you ask me!