Burning smell

[DekedHockey]

I can smell something burning,  typically its most strong if you stick your nose between the cab and bed. Any thoughts?

[DekedHockey]

its a 2017 2500 HD has about 24k miles on it

[DmaxHugh]

Diesel? Regen?

[Mdmartin3z]

I’m new to diesels as of last January when I got my 3500. I was very skeptical and nervous the first time I smelled burning.  I would look everywhere under the hood looking for something melted and do the same from underneath. I’m 99% sure the smell is from the regen. Normal stuff when you’re truck is cleaning itself.