I have a 2016 Ecodiesel. Up to date on all ECU flashes with the exception of the U07 which I have told them at each visit not to do. After the AEM (V08) update, I purchased the GDE tune. All was fine until 2 weeks ago and the truck threw a P20EE code (catalyst efficiency is low for bank 1). I took it in this morning for them to look at it. I had re-flashed the factory tune last night to get ready for the visit today. In doing so it erased the code when flashed to the factory tune. So when they looked at it today, they had no clue as to what caused the code. Cost me Just under $80 for them to look at it and tell me nothing was wrong. And oh.....by the way......we flashed that U07 recall for you!!!! Well SON OF A B.......!! I had forgot to tell them early this morning to not flash anything. I'm F....ked on this. They are telling me there is no way to reverse it. Oh well, worse things can happen. So I get home and go to re-flash my GDE tune and DAMN!!!! Now I get an ECU number mismatch and it will not re-flash the GDE tune. There is only one letter difference at the end of the ECU numbers (from a P to a Q). Was this due to the update/flash that they did today? I have not contacted GDE yet. Just got home and it is after 6 PM Central time so don't know if they are still answering emails at this time of the day. I will send them questions about this too. Any input?