DD15 shutting off.

Check oil and coolant level.

 

If your coolant and oil is ok, you can go down the road and when your engine light starts blinking, press the OVERIDE button. I have gone up to 400 miles like that. My shop told me to do it. Check with your shop.

Edit: I assume you have tried doing a Re-Gen?

 

I wonder if the engine is derating? Have your tired a Re-Gen?

 

It is down there on the right with the rest of them switches. It may say engine override, I can't remember. I have a 2010 that has it. Yeah, the coolant needs to be near the max full line. The minimum full line is a little low, actually.

Edit: I think it is just right of the Re-Gen switch.

 

Here is a picture for reference. Directly below the the air valves, to the right of the 4-ways button on this 2016 Cascadia. If I'm not mistaken, it was in the same place on the 2010 Cascadia I ran.