rusty503

I suggest you check the wiring in the door hinge area. Sounds like you have some damaged or broken wires there.

Then let me apologize. I have not seen one of those before. I take it that you use the lever to swap between camera and mirror. If it is auto dimming then look for a dark dot at the top center of the mirror glass. That is the portion you will want to cover. That is where the sensor is at. There are actually two of them. One on the windshield side and one facing the rear. The mirror looks for a difference between the two. If the one on the windshield side senses darkness and then increased light level on the mirror side one, the mirror starts to dim. If the windshield side sensor detects daylight the mirror will not dim because there is little to no difference in the light levels.

This not an auto dimming mirror. That one has a flip lever on the bottom. Auto dimming mirrors do not have that.

Or the wrong sender.

I went to my local chevy dealer for an oil change on my Silverado on Friday. While there I noticed a new Camero and a new Silverado idling at a fairly high rpm outside the service bays. There were running floor fans pointed at the radiators. A service advisor told me later that all vehicles with the 6.2 engine had a stop sale on them until they had run the engines for 4.5 hours. He said it had something to do with the valves. I guess it has to do with the valve springs?

I checked mine and it does have a textured rubber mat in it. 2021 Sierra

I am thinking of using some shelf lining material. Some of the thicker type. I think I will also check craft stores to see what is available.

It would help if you list the issues you are having to help everyone to give you more meaningful answers or solutions.

The bulletin is dated July 6 of this year so before the 2021s.

There have been numerous posts about the same type of issues. One thing I keyed on was an issue with the bolts in the underhood fuse box not fully tightened. There is a TSB for the issue. It is for 2019 but I have seen posts about the issues on later models. Do a search. May not fix your issue but it is easy to check.

While I totally agree with you, I don't want to take a chance. Like a saying goes, an ounce of prevention is worth a pound of cure. Better safe than sorry.

I am trying to be proactive not reactive especially hundreds of miles from home in the early morning hours when no dealers are open.

There have been numerous posts about the loose bolts in the underhood fuse box causing crank but no start, cel popping up and other warnings. There is even a TSB on it. I just couldn't find the size of the bolts.

Thanks! I plan on checking that before I leave the lot.

I am about to buy a new 2021 Sierra next week. I will be going from NC to Dallas to pick it up and then drive back home. With the issues I have read about the fuse block bolts I want to be able to fix it myself before heading back for 1000 miles. What size are these bolts and do I need a short extension? I would really hate to be stuck in the middle of nowhere.