Help? Cascadia dd13 eec 61 545 14113 325 1 fail 16

2012 Cascadia, 338k, was running fine, in a span of 10 minutes i got the solid yellow check engine, them flashing yellow, then red it derated to 5% and stalled out. I know the code is exhaust related, but havent had any luck getting more specific. Shop isnt open till monday, any help is much appreciated! Btw def tank is full.