Rattling on start up...need some help

Justin Kramer · May 9, 2016

Hey guys, I have a 2012 2500hd with the 6.0 gasser. Good truck but it's been intermittently clacking on start up. It will last roughly 1-2 seconds, but it's loud enough for me to notice the noise. After 2 seconds, it shuts up and is quiet. Very intermittent. Always serviced by the dealer, 37,000 miles. I feel like the dealer will tell me that if they can't replicate it they can't help me. I've been trying to get video, but shy of starting my camera every time I start the truck, it's annoying. I hate to think it's a lifter bleeding down, because I really don't want to have to open the motor up.

Thoughts guys?

Justin Kramer · May 9, 2016

https://youtu.be/lqNEzG0P1Cki

Here is a video. You can hear it right away. After a second or two it goes away.

Justin Kramer · May 9, 2016

I took it to the dealer today. I will report back their findings.

sagent · May 10, 2016

I had my 2011 6.0 L do it a couple of months ago after starting it in the garage after sitting about 2-3 weeks. Has not done it since

carkhz316 · May 11, 2016

My '12 and my brothers '11 (both 2500 with 6.0) do exactly this. It seems more likely to do it the longer it sits without driving, but I've seen it happen twice in one day. I had it in the dealer a year ago for warranty work, and of course they couldn't find anything.