DEF System Issues - DEF Injector, Pump, Filter, Etc!

DEF injectors clogging would be number 1, on Macks we have seen DEF pump failures around the 450- 550.000 mark. Nox sensors are a common failure. Loss of communication with ACM or J1939 problems on the bus that connect acm, Nox sensors and VGT will cause a derate also. Some trucks will go longer with an active code than others before derate. We seem to have the most derate problems with Mack MP7's and 8's. Cummins ISX 15l seems to be a bit more forgiving

 

We haven't had any emissions related issues with any of our trucks. Of course the newest one is a 1996.

 

Off topic.. but I have to agree. 2007 386 with C15 and DPF did nothing but cause problems. Now in a 2005 with a 2004 acert.. no dpf, no egr. Very reliable truck.

I'd rather throw money at an older truck. At least I can see and understand when something simply wears out. Throwing good money after bad at something that simply does not work reliably is bad business in my opinion.

Hurst

 

Our trucks are old but to be honest, we aren't mainly a trucking company and our trucks see few miles. That helps us being able to run the older stuff.

We have a 1994 FL that was bought new and it has less than 300,000 miles on it. We've also got a 1983 FL that we don't use much anymore, it has less than 500,000 miles.

We just bought a 1995 Pete that has 2 million miles. Pretty much everything mechanical has been replaced at some point so it's a pretty good truck.

As long as I can hold out, I'll stay with everything 1999 or older.

 

def injectors clogging partially depends on how clean the engine runs/ how much def gets sprayed continously. Software to activate the pump and injector so you can check def pump pressure and injector spray volume versus time is a big help in figuring out what is causing your issues

 

I have 2011 Volvo d13 900k miles it’s in derate now code 5394 fm 5 says scr system fault before it derated when the check engine comes on I used to flush the fuel water separator filter and wait ten minutes the. The light goes off and drives normal for 200 miles or so then happens again last time it happened I tried the same thing but didn’t work this time and the engine derated I noticed the def gage is at 3/4 full after tons of driving makes me think that the def is not being pumped mechanic not sure if it’s the def pump I changed the dower last week but the issue remains any help please ??? Thanks so much guys