what happen when you run out of DEF?

The engine will most likely derate , truck may have to be towed , boss will be very pissed

Google nearest truck place , call them , get some DEF in the tank before the company
gets involved

 

How much DEF is in the tank?Can you make it to the next truck stop?I wouldn't keep driving it.

 

It will derate turn on check engine light and if ran long enough shut off the truck but once u fill it and cycle the key its not a big deal other then the logged code but it wont be active

 

Get to the nearest truck stop ASAP and fill it up to avoid serious issues.

 

Think it more likely a tow company would come out with a box or two of blue-def before the truck was towed...

 

It will blow up , as in spontaneous combustion.
Proof gone !!!!!!!

 

This is from my visor on my Volvo 780. I'm going to assume it's pretty much the same for all DEF/SCR trucks.

Solid DEF warning lamp

The DEF tank is low

Refill the DEF tank




Flashing DEF warning lamp

The DEF tank is empty. Engine is in derate mode.

Refill the DEF tank now (before adding diesel)




The DEF warning light is flashing + warning message on driver display

The DEF tank is empty. Vehicle is limited to 5 mph.

Refill the DEF tank now (before operating vehicle)

So you have some time to get it filled up once it's empty before you are FUBAR.

 

I carry an extra box...just in case