2021 Sierra - Delani with the 6.2 - the DIC is flashing suspension, ESC, E-brake messages for no reason on the dash, 5,000 miles

[Newmans2021]

We bought our 2021 Sierra this spring and drove it for 5,000 miles without issue.  Installed leveling kit (can't remember if it was 1.5" or 2"), new tires and rims and had alignment done within first month - no issues and a few thousand miles later.  Within the last couple weeks, around mile 5,500, all the DIC (driver info center) lights have been coming on and we have not seen anything consistent with the frequency of them.  We have not noticed any loss of power or braking issues. 

Took it to the dealer 3 times now and they could not find anything wrong with it and did not see any codes when scanned.  They stated because the lights didn't flash for them, there was nothing wrong and sent us home.  Finally took video of warnings and dropped it off with codes flashing.  They had it in the shop 3 separate times two days and said it is the leveling kit, but will keep the ticket open in case the lights come back on.  I realize it is hard to diagnose and pinpoint electrical issues, but I feel like there is so many unknowns about these vehicles when it comes to trouble shooting.

If it is the leveling kit, I wondered if something needs to be recalibrated?  Anyone else hear of issues like this?  Would the leveling kit cause this? I am not seeing a connection here but could be missing something and am hoping someone can share or give an opinion.  Thanks in advance and appreciate all advice!!

 

UPDATE 9/2/21:   Leveling kit removed and still have codes flashing, at a loss as to what to do next and very disappointed!

Edited September 2, 2021 by Newmans2021
Update

[Tahoe02]

Take it back to the Dealer and have them fix it since the leveling kit has been removed and they can't blame that anymore. Good luck.

[BDogg]

I am having a very similar issue on my 2021 GMC Sierra Denali 3.0 Duramax with 4900 miles on it has been losing its mind.  I get multiple, rotating DIC messages: “Service ESC”, “Service Parking Brake”,  “Service ABS”, “Adaptive Cruise Control Disabled”,  “Steering Assist Reduced Drive with Care”, . . . ). The error messages come with other “benefits” besides disabled cruise control. I also enjoy no GPS signal, no Blind Spot sensors, no collision avoidance sensors, and who knows what else.    I have posted details here: 

 

[gemarsh]

Underhood fuse panel2.pdf

[lapoolboy]

Has this bulletin been updated to include 2021's?  OP's truck is a 2021.  Mine is a 2021 and I've had this problem one time at just over 20,000 miles.  A quick negative cable removal/replacement solved it, but I have torqued the four bolts to proper spec.  Fingers crossed.

[Brooklyn21denali]

My2021 denali did this yesterday esc warning check engine light i tried to reset code with scantool and then a no start.  Removed negative battery terminal and trouble went away.  But I already lost a lifter at 3k. Now this at 6k.  Hate to say it. But these trucks suck nowadays i cant wait for market to open back up so i can ditch this shitbox !!!!!!!!

[1997SierraSLT]

GM doesn't have to manufacture quality vehicles as long as the consumer continues to purchase.  The days of owning GM vehicles past the warranty period is cost prohibitive to the consumer.  GM is banking on their loyal customer base to bend over every 36,000 miles and trade up.  Seems to be working out quite well for GM.

Edited February 18, 2022 by 1997SierraSLT

[henry1834]

i have the same issue as Newmanns2021 except my truck is a used 2020 and it has 74K miles on it. i had replaced the spark plugs at 60K. truck ran fine for a long time. about a2 months ago i was at a drive thru and just made a turn to the window when the same codes came up and the engine starting idling rough. since this is out of warranty i took it to a shop and they spent the whole day looking for the issue, but did not find out what it could be. i started looking on the web for this issue and found that it is an upcoming problem. some people said the dealer replaced the lifters. this concerned me as i did not rev the engine high or drive the truck roughly.

 

i did check the fuse box int eh engine compartment and found that it was not tightened to 53 in-lbs but it was not very loose either.

 

i saw a forum reply that one guy just started using gas with a high octane. so thought that before i started tearing into the engine and looking for loose wires i would test this out as i was using a 87 octane rated gas and not all from the same gas company. i put in 93 octane the first 10gallong and after 200 miles the truck started running like it did before and all the error codes went away. i just had to clear out the misfire code with the scanner. i have driven it for about 20 miles now and truck runs like it did before. i will see if this lasts.

[homermacleod]

This happened to my refreshed 22 twice. One with around 3000 miles and the second time at 5000. the first time, it cleared itself and the dealer said that they could not do anything since the lights went away. the second time, they replaced the brake controller and master cylinder.  I'm at 12000 miles and haven't had that problem reoccur yet.