Have a 2015 f350 fx4 crew cab dually 6.7. 128,000. Def delete egr unplugged tuned with a shift on the fly knob but I bought truck like this and I do not have the tuner nor do I know who what where how it was tuned. That being said wrench light along with traction control light came on and the tranny won’t shift unless I put in M and shift with the buttons. Shop couldn’t read any codes cause the tuner that I don’t have has the Emc locked. Was told it may be the sensor on top of rear end but really no shop or person I’ve talked to has ever seen this (only would happen to me) but anyway. Has anyone ever seen or heard of this ?