2019-AT4

Had a new Fuel Control Module installed by the dealer about 3 weeks ago. So far so good

Have they tried a new fuel control module?

Same exact issue here but I made it to the dealer before the code reset itself this time. They say bad fuel control module. I should have a new one installed in the next week

Mine does the same exact thing. Took it to dealer and they said it was a bad fuel control module, which I guess kind of make sense. When the issue occurs, sometimes the engine will actually start but will shutter off after idling for maybe 1-2 seconds. This is what makes me think it may actually be the fuel control module. Fingers crossed that it fixes the issue because it is a pain in the ass not knowing if my $60k brand new truck is going to start for work. It has happened about once a month since I've owned it.

Anyone having this issue with a 2020 model? If so, what was your build date?

what was the issue with the Ready Lift kit?

I put on a set of 285/65/20 KO2s and they fit without any rubbing at all. This was before any level or spacers. They just looked too damn skinny. I don’t think the 295 were even an option at discount tire otherwise I would have tried them. Although I think they would end up being too big and probably look skinny the 285/65/20 and the 35x12.5x20 end up being almost the same exact diameter. The later being significantly wider and beefier looking. honestly I love my setup. .375 bora spacers are good to go as they are hub centric and leave plenty of threads left on the studs. You cannot even tell at all that they are sticking out more than the rear tire.

Forgot I had this picture. With OEM arms the 35x12.5x20 KO2 tires did rub at full lock. This was before the leveling kit.

Thank you! will post closeup pics of trim job tomorrow. I did install the Ready Lift UCA with their 1.75” leveling kit. I also installed the .375” bora spacers, which were definitely needed as the new arms moved the ball joint a tiny bit closer to the tire. I was already cutting it close. no rubbing on the arms at all with this setup. two pics below. One with the OEM arms before the level - without spacers. The next pic will show the distance with the level, new arms and .375” spacer. something to take note of. The OEM UCA ball joint has a sharp edge that points towards the tire, so if the tire made contact, it would not be good. The ready lift ball joint is rounded, so if there was minimal contact for whatever reason, I don’t think it would do much. Hard to tell from the pictures but I had like 1/8” of space with the OEM UCA. I think I Have about .375” of space now. I think I would REALL have to get wild to see any rubbing on the ball joint now. Even if it did rub, it’s round like I mentioned earlier and I couldn’t imagine it hurting the tire.

Update 1.75” Ready Lift leveling kit installed. Also has the wheel well trimmed to eliminate rubbing with my 35x12.5x20 KO2s

Awesome thank you! just installed 35x12.5x20 BFG KO2’s on my 2020 AT4. No lift or any other modifications. Rubs on the front mud flap plastic Brackets at half turn to full lock. Nothing that can’t be fixed fairly easily. I’m more concerned with the control arm ball joint. I have maybe 1/8” between the tires and the ball joint. waiting to install the ready lift level with control arms, which apparently places the ball joint about 3/8” closer to the tire. I’m waiting on .375” bora spacers. I’m hoping that will be enough because if I have to jump up to a 1.25” spacer, I’m pretty sure I won’t be able to trim my way out of the situation due to that metal bracket behind the mud flaps Looks amazing - will post pics tomorrow

Have you you installed the 1.25” Bora spacers yet? Did you end up having to trim the lugs?

Which leveling kit do you have? how close are you to rubbing on your ball joint?

there’s so much contradicting information. Take a look at this guys posts. Did you not have any of these problems? how close are you too the ball joint? are you worried about your ball joint angles with OEM Arms?

Well this sucks because I just bought some 285/65/20 KO2's and the ready lift kit. It's also very confusing to hear this because if you look at the thread below you will see that a guys are running 35x12.5x20 tires without a level or anything. Ready Lift told me that their control arms are the exact same as OEM control arms other than the ball joint upgrade and angle. Something doesn't add up Any thoughts? https://www.gm-trucks.com/forums/topic/216586-owners-pictures-of-35-tires-on-stock-at4-or-trail-boss/

Which tires are you running?

Would like to know as well. I should have the kit in about a week from now.

Do you have a part number?

Those numbers are for tow mirrors without cameras or lane assist/blind spot. You can order a truck with tow mirrors with cameras and with the lane assist, so there has to be a part number out there for them.

That’s good news about the cameras! Sucks about the dimming parts. Please let us know if you come across part numbers for the tow mirrors with cameras. You should make the dealer give you a P/N for them so you can verify that they’re dimming.

Any word on the surround view with tow mirrors? I just bought a 2020 with technology/360 cameras and would like to add tow mirrors at some point.

Keep up the good work. So for a 2019-AT4, what parts do I need? Would it just be these? 84395830 / Head-Up Display 23407367 / Mount Bracket windshield PnP harness or tapping into certain wires? Is the PnP a custom harness, or is there an OEM part number? id be more than happy to purchase one from you!