dmt0707

Hello I have a 2020+ 2500hd LTZ. While driving and stopping I can hear a clunking sound from under the truck. I came to the conclusion that it’s coming from my DEF tank. I believe it’s the fluid moving back and forth or something else moving around. It doesn’t matter how full of empty it is. I’ve owned a diesel before with a def tank and have never heard a sound like this from the tank. I mean the slightest stop, and I can feel the clunk in my feet. Anyone else have this same sound ? thanks