[MadMac]

OK guys/gals, I'm having my first issue with my truck. On start-up I get the above mentioned sounds and they seem to be coming from under the front seats/floorboards. The truck has been driven mainly on-road but I have used it on forestry access roads which consisted of sand/muddy gravel. Did not hit any deep potholes or rocks/boulders(LoL) and d/n power slide any corners. I don't see anything hanging down or out of place. I plan on crawling under it this weekend with a pry bar and take a look see. Thanks MADMAC

 

[Rockcrawlerdude]

Mine was rattling very loud like crazy mostly at idle. Turned out to be the ecm loose on the firewall, it was really loud lol. Sounds crazy but it is(was) a common problem, 3m tape fixed it. I have no idea if they fixed that problem at the factory, if it even applies to your new truck. passenger side below the coolant reservoir on the firewall. It snaps in place and the snap latches aren’t strong enough

Also, I have heard of loose front fender rattling from the factory but I have not had that problem.

Also, there is a problem of clunky/rattly steering over bumps, but you mentioned startup so I figured idling. I have this problem on gravel roads. The fix is a replacement intermediate steering shaft, which is covered under a gm tech bulletin.

Hope this helps

 

[MadMac]

Mine was rattling very loud like crazy mostly at idle. Turned out to be the ecm loose on the firewall, it was really loud lol. Sounds crazy but it is(was) a common problem, 3m tape fixed it. I have no idea if they fixed that problem at the factory, if it even applies to your new truck. passenger side below the coolant reservoir on the firewall. It snaps in place and the snap latches aren’t strong enough

Also, I have heard of loose front fender rattling from the factory but I have not had that problem.

Also, there is a problem of clunky/rattly steering over bumps, but you mentioned startup so I figured idling. I have this problem on gravel roads. The fix is a replacement intermediate steering shaft, which is covered under a gm tech bulletin.

Hope this helps

Thanks RCD, I drove the truck again and did notice a "clunk" in the front end during left turns on a bumpy county road, so I will crawl under it with the wife turning the wheel back and forth to see if I can duplicate it and if I can't, it's off to the dealer on Monday. Got snow on the ground today, so I'll wait when it melts off tomorrow and get my BIG hammer out,LoL! MADMAC

 

[Rockcrawlerdude]

Did you find your other rattle you were having on start up?

 

[MadMac]

Did you find your other rattle you were having on start up?

No not yet, I plan on getting under it today after I clear my driveway of snow. I will keep you posted on what I find if anything. It's probably nothing but I do have this thing about rattles and squeaks, especially on new vehicles that haven't been abused yet. MADMAC

 

[Rockcrawlerdude]

No not yet, I plan on getting under it today after I clear my driveway of snow. I will keep you posted on what I find if anything. It's probably nothing but I do have this thing about rattles and squeaks, especially on new vehicles that haven't been abused yet. MADMAC

I hate rattles. They make me nuts. My wife thinks I’m crazy. Lol

 

[RollyPollieBenito]

I hate rattles. They make me nuts. My wife thinks I’m crazy. Lol

I trust your wife’s judgement.

 

[MadMac]

Well I managed to get the little bit of snow cleared and got my crippled *ss under the truck today. I took a crow bar with me and stuck it between the trans. and transfer case mounts and could not see a lot of movement. One thing I did notice is the transfer case mount on the cross member, drivers side, the bolt/stud has a rubber bushing on the bottom of the flange of the transfer case but not on the top of the flange (sandwiched). looks odd but maybe a design flaw??? Tailpipe seems tight from one end to the other. No shocks are loose (I know there was a recall on the DSSV shocks on the earlier ones). Had the wife start it while I was under it and nothing moved, rattled, or popped. I checked under the hood and all was tight on the firewall (ECM and assorted hardware). Soooooo I'm off to the races LoL! I guess I'll drive it until I see something laying in the roadway in my rear view mirror!! MADMAC
P.S. Thanks for the suggestions RCD.