2010 kenworth Cummins isx too much white smoke coming out of muffler

Hello friends,

I have a 2010 kenworth t800 with a Cummins isx and I have cleaned it’s dpf filter just recently. However there are times where so much white smoke comes out my muffler and then stops and comes back sometime later. In a 10-12 hour drive it will have white smoke around 3 times for around 1-2 hours each time where the smoke comes out in 2 second bursts.
Any help will be great!

 

Any coolant losses?

 

If it’s not using coolant ,Sounds like it’s doing a regen I’d look at the 7 th injector .

 

They cleaned the DPF but how was the catalyst ahead of it (the DOC)? When the catalyst starts to fail it will start to smoke white I believe.

 

I've heard that is also a symptom of a bad def doser valve

 

Take it to Cummins, not a dealer.

 

Hello sir,

where is the DOC located and how does it look like?

 

No sir no loss at all

 

It looks very similar to the DPF and it should be mounted just ahead of the DPF (exhaust should flow through it first, then into the DPF).