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2019 HD2500 it makes a rumbling thunder noise when I turn off engine and smells like something is burning. does anyone know what it is?
 

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Truck was probably doing a regen of the DPF. Mine sounds the same way if it’s doing a regen and I turn the truck off.
 

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Mine makes a terrible noise as well when I shut it down - it's my wife!!
 

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After shut-down, my '16 sounds like R2D2 is under the hood...and mad about it.

All kinds of clicking and servo noises.
 

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When my 2019 is doing a regen the rpm's will be just above 750 when it is normally around 600'ish when stopped at a light or in the driveway. If you get out of your truck the exhaust will be hot as hell and blowing harder too.
 

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My new to me 2017 GMC HD3500 LP5 makes all types of hard to describe noises after I shut it down (whirring, buzzing, slushing, etc.); noises that my 2011 LML never made. They don't really bother me and I assume they are normal since the truck runs fine but....are these noises normal?
 

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After shut-down, my '16 sounds like R2D2 is under the hood...and mad about it.

All kinds of clicking and servo noises.
After shut-down, my '16 sounds like R2D2 is under the hood...and mad about it.

All kinds of clicking and servo noises.
That's the "egr clean sweep" basically runs the egr moter full open and closed a few times to prevent egr valve from sticking 100% normal even with a key cycle.
 
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