ForkliftJeff

Just looked through my records. Turns out It was in once before in November 2021. Hmmmm, I think they should have replaced it while it was there the second time in February according to the TSB.

I'm having the same issue in my truck. First happened February 2022. Heard sizzling coming from behind the rear seats during rain and with the defroster on, turn defroster off and the sizzling stopped. Checked and sure enough the leak was coming in top right side of my rear window. Took it in under warranty and they resealed it. I got it back and there was urethane everywhere. It was on my paint, on the glass, and the spoiler. I had to take it back for them to clean it all up. Fast forward to now..... I'm getting that rainy day sizzle again. Called the dealer and I'm getting the well it's out of warranty now and you need a new rear window to fix it. I complained, having no faith in the previous repair seeing how the outside looked with sealant all over the place, and they have agreed to split the cost of the new window replacement 50/50. But that's still over $1000 so I'm not sure what to do. Was thinking about doing the reseal myself but not too sure yet.

The dealer removed my cover and gave me a full refund which more than covered my new Backflip MX4. Gonna be Installing it this weekend.

Well turns out this cover leaks too much for my liking as well. And the service manager agrees so they are going to take the cover off and refund me. Most likely gonna go with the Extang Xceed.

I’ve pushed mine back a few times already. It just slides back. I’ll ha e to let the dealer know about it.

Has anyone else noticed the exterior window trim separating? I’ve pushed it back a few times but it keeps separating. It’s not even lined up correctly.

An update for ya. I contacted the GM team above and they replied back. Unfortunately they are the US team and I need Canada but they forwarded my info and the Canadian team got right back to me. I had my truck in for its first service and to have the tonneau cover looked at. They didn’t really listen to my concerns and adjusted the cover making it way worse. I got back to the GM customer care team and gave them a word document with pictures showing every little issue as well as a few videos. They got the service manager in touch with me and we made an appointment. So last week I dropped off my truck as well as all my info on the leaks and let them at it. 4 days later I got my truck back. They installed a new cover as well as did some modifications to help prevent any leaks in the future. They said the water test was good so now I’m just waiting for it to rain so I can see if it is any better. The cover looks 100% better than the last one. I have high hopes for this one but time will tell. And the customer care team did a great job at keeping me in the loop. I think I have about 15 emails back and forth with them.

Nobody else having this issue? It’s happened a few more times. I have noticed a few times while it does it it shows “media indexing”. I think it says that when I’m on USB. I was wondering if it might have something to do with my 32GB USB stick full of music. Maybe too much info for it to read while the radio is starting up?

I was a detailer for a few years when I was younger and it’s been a hobby of mine ever since. First things first, try not to wash in direct sun, especially for dark colours, like black vinyl. For a soft vinyl tonneau cover I would use a diluted all purpose cleaner like Simple Green (dilute based on strength needed) with a soft bristle brush. Keep the paint of your truck wet and wash or rinse the cleaner really well from your paint. If it’s too strong it can leave streaks that will need to be waxed or polished out. After the cover is rinsed really well, let it dry. Then get yourself a good quality exterior vinyl dressing. I prefer PRO products if you can find them in your area. Spray it onto a wax applicator and then massage it into the vinyl in small circles. Depending on how faded and thirsty your vinyl is it may need a few coats. Once it’s looking good and even you can either leave it as it is for the high gloss look but that will most likely gather dust. Get a clean rag and give the vinyl a wipe down to get any excess dressing off. This will help prevent dust. A nice wipe down can get you a nice semigloss look that will last for weeks (depending on the product you use). FYI You can use this process for tires and all that exterior textured black plastic trim (great for getting dried wax off of trim). Just vary the amount of cleaner you use depending on what your cleaning. And always remember to wipe down your tires after applying any kind of tire shine no matter what the bottle says. Otherwise as soon as you drive away it’s gonna fling all over tour freshly cleaned paint.

I got the upper and lower organizers for the center console the other day. The upper one is pretty decent, maybe the lower one will grow on me. There was a discount if you bought more than one piece so it was only $10 more. They are very well made and fit really well. The bottom one wedges in place right at the bottom. The top one has four little notches that keep it in place on the rails in the console. The little rubber non skid matts in the upper tray are nice and grippy and have a diamond plate design that looks pretty cool. They are made by Vehicle OCD on Amazon. Nice to have some organization in there now.

Hey all! New-ish member here. Just got back into a GM product after about 9 years with my ‘08 Dodge Dakota. Awesome little truck but it was coming time for an upgrade. Enter the 2020 Sierra AT4! I love this truck! I’m already loving the info on this forum and getting some great answers to my questions with this new truck.

I’ve had my 2020 AT4 for a few months now and occasionally right after startup I will get intermittent audio for about 30 seconds. It’s happened on all sources (usb, radio, Sirius, iPhone over Bluetooth). Everything else seems fine I can even watch the time of the song keep going and even pause while I can’t hear anything. Always clears up after 30 seconds or so.

Right on. I’ve had a few friends who were “told” how to setup their WDH but didn’t know there was some adjustment to dial it in perfect.

Do you have any adjustment left in your WDH? Maybe one less chain link on your bars would get you level?

Thanks. It was raining so hard that day. Helped in washing the winter grime off the trailer though.

For safety sake I would go with a WDH. They are easy to setup initially and then super easy every time you use it, just a couple extra steps. The highways I take to go camping can be pretty nasty... ever watched the show “Highway Thru Hell”? The twists and turns and steep hills can get pretty hairy in the rain or snow, or even on a dry sunny day can get sketchy. The extra control I feel with a WDH installed is night and day. The only thing I don’t like about them is how heavy the hitch is to put in the receiver. My trailer only weighs 4000 lbs so I tried it both ways because I really wanted to run a standard hitch to save my back. But the benefits of the WDH were clear.

Love how this truck pulls my little trailer. Much better than my 08 Dakota. No problems up those steep canyon roads.

Very cool I can’t wait to see what you do. I bought a black 2020 AT4 5.3L a few months ago. I love it! All I’ve done is had the dealer install the REV hard tonneau cover. I’ve got an organizer for the giant center console coming and I’d also like to get some vent visors.

Excellent point on the rails. The fronts go to the drains and the rears just drain near the tailgate. Just need some free time to identify each leak and take care of em.

Good to hear you guys have the same cover and it keeps dry. I just need some free time when it’s dry to get out there and do a proper water test to see exactly where it’s leaking and fix it.

This is the REV hard tri-fold installed from the dealer. I have read it is possibly made by the same manufacturer as the Backflip.

Now just gotta figure out why the gutter drains leak so bad. The left drain seems tighter than the right but both leak anyway. Might just have to silicone them.

Went out to take a few pictures and noticed the tonneau was installed crooked. I was able to loosen the two main nuts holding the front down and straightened the tonneau, as well as slid it back so the seal at the tailgate makes a better contact. Still gonna have to seal up the corners better and seal the multi gate but this is a start.

I bought a 2020 AT4 a couple months ago and had the dealer install the hard tonneau cover. This thing lets in so much water it’s crazy. Does anybody have the installation instructions? Curious to see if they installed it wrong. It looks like it needs an adjustment. The triple lip seal at the back of the tonneau barely touches the tailgate and lets in water. It looks like I have enough contact at the front to adjust the whole thing back a quarter inch. Also there are two gutter tubes in the front corners that exit through holes in the front of the box and they leak more water into the box than they get out.