3.0L_Johnny

They regenerate way too often for my liking, which makes it sound like a coffee can full of marbles and kills the gas mileage. It's the one poison pill about this engine. It'd be incredible to see what it could do deleted, but I'm not touching any of that until the powertrain warranty expires.

It's a different fuel map for when the truck is doing an active regen. You're hearing injector noise, it's not anything to do with any of the other moving parts. To be honest, it's my #1 complaint about an otherwise awesome engine. Regens happen way too often, probably because the DPF is small and either GM didn't want to pony up for a bigger one, or there were packaging considerations since the DPF is under the hood.