NHTSA Complaint #11427500 — 2018 NEWMAR DUTCH STAR

Three week ago today we were 500 miles into a road trip when the check engine light and alarm went off - we exited interstate at the next exit, called Spartan, and read off the codes. We were told that it was a DEF sensor that would be derating our engine and we need to get somewhere soon.. We were too far from home and made it another 130 miles with notice of some power loss. These sensors are back ordered until late August - mid September. After discussion with a Cummins service center in Chattanooga, TN it is deemed unsafe to drive the 90 miles to there location. We are told that the engine will derate down to only 5 miles per hour which will lead to a very unsafe driving condition for ourselves and anyone on the road with us. My understanding is that it's just a sensor messing up - the regent was performed as normal while the engine light was lit - indicating all was working with that system.