I've been reading through the forums, and nothing seems to help me out on other forums; I'm noticing it's a programming issue.
I have a 2018 2500 tradesman 6.7L Cummins and just deleted the EGR, intake valve, DPF exhaust, and S&B intake and installed the RaceME from Explosive Diesel.
I've also emailed RaceME with no response in 4 days now.
Ever since I installed the tune, the P2122 low circuit won't go away no matter what I do.
The truck is pretty much undrivable.
I have the advanced tuning levels down so I don't ruin my transmission or rear end.
Just feathering the throttle, the truck will run from 800 rpms to sometimes 3000 rpms and throw you back in the seat.
If you stay into the throttle, it's okay if you're on a drag strip and don't need to turn.
I've fully charged batteries, updated the programmer, unplugged other known sensors, and had no luck.
If I program back to stock, it goes away, but every emissions code comes back on.
I could go on, but I hope someone else has gone through this.
I've deleted my Fords and 2016 Cummins but never had this issue.