Driver drove without def fluid.

Why do a regen? Is the DPF full ?

 

Disable the DEF derate with Davie. RT steady state with cruise and load until lights clear.

You can also attempt to run SCR evaluation test. Leave on high idle with DEF disable ran after test completed if derate remains.

 

This ^ that said there is a non zero chance he may have fouled up the SCR as well and it may require a drop and clean or outright replacment. Not super likely but posible

 

Hopefully he didn’t kill the pump. They hate hate hate running empty.

 

Can you pee in a DEF tank? Maybe a little windshield washer added. So many things we never had to worry about.

 

The driver drove it without DEF, then tore it up, then hopefully got fired. I don't even know how that happens.

 

I am pretty sure a signal was sent to the FMCSA when this happened, and because he was signed on to his ELD, they have a full identification of the miscreant.
Then the EPA was also notified, and the FBI, where this individual was put on the 10 most wanted list, one of the few that has been authorized for immediate liquidation, shoot on sight. Of course the US Marshalls will also be assisting.
My advice is for him to surrender himself to the authorities immediately.
Something like Raymond Reddington in The Blacklist.