Another Newbee post
Engine light coming on.
We have a new (6 month old) Diesel Pusher and are new to Diesel Fuel and DEF. It was evening, we were slowed on the road in traffic only a short drive to our campsite the first time we saw and engine light. Just the outline engine light, not a check engine or Stop engine. All systems were reading fine otherwise, and there was no place to pull off.
This is when books are handy.
We did contact Service to report this light. We were asked to call immediately while the unit was running if it occurred again, but that since we had been in stop and go traffic, that it was probably caused by that, and nothing problematic.
Several weeks later we experienced the problem again, only now we got a Check Enging light on and off as well. So I pulled out the books and found that if you let DEF go low, you should fill to ensure the cleaning system works properly and completely to burn off fuel deposits. We had only added a couple of gallons to a low DEF tank. Once we filled that tank the Check engine light disappeared and after driving less that 30 miles, the outline light also went off.
Fill you DEF and if it goes low, don't just add some fill it again. Or just don't let it ever go below 1/2.