Who's tuning are you using PPEI or MotorOps? Also check the connections for the DEF module but i am sure you already did that, I've seen a crappy connection inside the actual connector on the harness be dirty and cause weird issues! Just check over all the plugs for the nox sensors whether you have them tied up or the plug kit, It might make a difference. Hope it all works out for you!I've had nothing but issues with mine since deleting it. I've had my "Service Exhaust Fluid System" light on now for a week with no fix in sight. I keep getting sent different files and solutions to try with no luck. There are no DTCs. Had it at the dealership today to see if they could offer any insight but are unable to do anything with the unlocked ecm. I'm likely going to try a different company for tunes as this one is not working for me at all.