Service Leveling System

[chc4au]

2024 Yukon Denali Ultimate
Service Leveling system warning shows intermittently and ha done this since truck was new. No problems that I can tell and on 3 visits to dealer ( regular service)!they find nothing wrong and no codes.
No rhyme or reason and if car is restarted it goes away.
Has anyone else had this issue and what did they do to fix it.
Thanks in advance

 

[Antonm]

Do you carry a lot of weight in the back end?

If the load it too great such that the air suspension can't level the truck, it'll throw that message (and not leave a code). GM could've been a little more descriptive other than just "service leveling system", but usually the only people that have that issue are those towing really heavy tongue weight trailers without a weight distribution hitch (like a car trailer or something).
...

 

[chc4au]

Do you carry a lot of weight in the back end?

If the load it too great such that the air suspension can't level the truck, it'll throw that message (and not leave a code). GM could've been a little more descriptive other than just "service leveling system", but usually the only people that have that issue are those towing really heavy tongue weight trailers without a weight distribution hitch (like a car trailer or something).
...

I don’t usually have anything in truck and go weeks with just me and my wife. Have never towed anything.

 

[pTahoe]

I have had the exact same issue with my low mileage 2024 Tahoe Z71. Had it to the dealer twice with photos of the warning message, but they could never solve it.
It is disappointing when a vehicle (or anything else) throws an error message that is not logged.
Posted about this back in August. After the warning message, the suspension is disabled from changing. Sometimes a restart clears it, other times not.
One time, a secondary message like "suspension too high" came up.
Finally the warning message happened at a convenient time last week on 10/23/25 and I drove it right into the dealership and kept it running so they could have a third try at it.
The WiFi OBD2 dongle they use at the service writer area did not show any trouble, but it was clearly on the dash. Maybe the service techs have a different software/hardware to read deeper codes.
Don't know how fast they worked, but supposedly they ordered a part on 10/24.
Called them today and they are still waiting on some part.
Service advisor seemed to say they are replacing the main suspension control board.
One thing I will mention, is that often when I walk up to my parked Tahoe, I will hear the suspension exhaust a bit of air.
But when the warning code is acting up, I don't hear that.
So I am suspicious that maybe the exhaust solenoid valve is getting stuck (or maybe the controller driving it is intermittently bad).
Anyway, long post, but I will report back whatever they find.

 

[rlhmarines]

I have had the exact same issue with my low mileage 2024 Tahoe Z71. Had it to the dealer twice with photos of the warning message, but they could never solve it.
It is disappointing when a vehicle (or anything else) throws an error message that is not logged.
Posted about this back in August. After the warning message, the suspension is disabled from changing. Sometimes a restart clears it, other times not.
One time, a secondary message like "suspension too high" came up.
Finally the warning message happened at a convenient time last week on 10/23/25 and I drove it right into the dealership and kept it running so they could have a third try at it.
The WiFi OBD2 dongle they use at the service writer area did not show any trouble, but it was clearly on the dash. Maybe the service techs have a different software/hardware to read deeper codes.
Don't know how fast they worked, but supposedly they ordered a part on 10/24.
Called them today and they are still waiting on some part.
Service advisor seemed to say they are replacing the main suspension control board.
One thing I will mention, is that often when I walk up to my parked Tahoe, I will hear the suspension exhaust a bit of air.
But when the warning code is acting up, I don't hear that.
So I am suspicious that maybe the exhaust solenoid valve is getting stuck (or maybe the controller driving it is intermittently bad).
Anyway, long post, but I will report back whatever they find.

I also just got this message on the DIC screen yesterday for the first time and again today and we haven’t done any towing or carried any heavy loads. The message has come up on the display usually after parking as the air suspension will not lower to its easy exit/entry level by exhausting the air from the system. This issue seems to clear itself after awhile or after a brief power off and cycling of the ignition, it happened today while out running errands with my wife. OnStar said take it to the dealer for further diagnosis.

 

[chc4au]

I had my truck at the dealer for an oil change (3rd) and have mentioned this each time. This time I took copies of some of the various comments in these forums along with pictures of warning on different dates and mileage points. Long story short they want to keep the car for several days an will take in 12/1/25 as I will be able to do without vehicle for a few days. Meantime any time warning comes up I take Picture.
Will post further if I achieve any results next month.

 

[chc4au]

I had my truck at the dealer for an oil change (3rd) and have mentioned this each time. This time I took copies of some of the various comments in these forums along with pictures of warning on different dates and mileage points. Long story short they want to keep the car for several days an will take in 12/1/25 as I will be able to do without vehicle for a few days. Meantime any time warning comes up I take Picture.
Will post further if I achieve any results next month.

Okay Had my car at dealership for 3 1/2 days this week and it is supposedly fixed.
This is what the work order says "removed and replaced automatic level suspension control module, performed all programming procedures and inflated suspension system reset trim height and cleared codes. verified operation of suspension system after repairs"
We'll see if this works.

 

[pTahoe]

Okay Had my car at dealership for 3 1/2 days this week and it is supposedly fixed.
This is what the work order says "removed and replaced automatic level suspension control module, performed all programming procedures and inflated suspension system reset trim height and cleared codes. verified operation of suspension system after repairs"
We'll see if this works.

Hope it works for you!
I had to start a support claim with General Motors, which I don't think really means much.
My Tahoe already had the control module replaced, the solenoids replaced, and presumably all the software relocated and the configuration calibrated two visits ago.
It threw the "Service Leveling System" message again yesterday, and I took it back to the dealer for the fifth visit on this topic.
The technical case seems to have been escalated a bit both at the dealer and with GM, and I think they said that GM is having them "look at the compressor".
I think the only other active items in this subsystem are the four corner level sensors.
Stay tuned.

 

[rlhmarines]

I’m scheduled for next week to see my dealer for service on ours so hopefully something fruitful will come of it.

 

[chc4au]

What I didn’t say was what I had to do to actually get something done. The GM app shows the location of your car with enough detail to see if it actually goes into service or sits on the lot. I did not watch it on day one but on day 2 it never moved. I called the service advisor several times over day 2 and mid day on day 3. He told me that he needed to talk with the technician to see what exactly was being done rather than”making something up”. After about an hour and a half when he didn’t call and I couldn’t get him on the phone I called the Sales Manager a great guy that lives down the street and told him what was happening. I was going to get my car but the sale mgr told me to wait and he called back saying they would have a part next morning and come get a loaner car. Basically he cut through the service dept. BS and got something done. This may not fix the problem but it is a start. When I picked the car up the service advisor was a little frosty.
I guess my expectations were to high for the last 30 or so years we had Lexus vehicles or I had a company car that was taken in for service by our fleet maintenance people.

 

[rlhmarines]

I’m currently at my dealer for servicing and asked for any code failure history printed out and it shows a few things but I’m not really sure if it’s related to the suspension failure messages, quite a few DTC codes but no dates of when it happened.

 

[pTahoe]

My Tahoe has been back at the dealer since late last week, this is the fifth visit for this issue. Supposedly they were going to "look at the compressor" a bit, but that did not appear to happen. The latest news is that a "GM engineer" (I assume a factory technician from the Los Angeles area, but IDK) is coming out to the dealership today to troubleshoot the issue.

 

[rlhmarines]

So after checking over the leveling system they were not able to find anything wrong but they did readjust one the front sensors in the bumper which somehow was not flush with the bumper cover. I

did not have a displayed or active alarm message before coming in so they didn’t really have a direct line to go after.

So as I was driving away from the dealership I noticed the suspension raising as normal once I got up to speed but just a short time later I noticed the message service leveling system so I headed back to the dealership so they hopefully pull a code as I did not shut the car off so as to not lose the message alarm. They were successful with finding the alarm and they also took a picture of the dashboard alarm.

 

[rlhmarines]

There’s a tip for this from GM on the air ride leveling system for all the full size vehicles, here’s some photos I took of the diagnostic tip they gave me.

 

[rlhmarines]

More

 

[rlhmarines]

I’m going to drop her back off tomorrow so they can have a more thorough inspection. I hope this helps.

 

[pTahoe]

Your truck is doing exactly what mine is at this point.
Thanks for the tech note. I had spotted this many weeks ago and brought it to the dealership's attention; they said they had looked into it, but not sure I trust that.
Just called my dealership, and the local GM tech person has not even shown up yet.

 

[chc4au]

Okay after a month and over 1000 miles the “Service Leveling System” warning has not returned. Hopefully the fix above will last.

 

[bttran]

Was it just what you had done in the work order? Been to the dealership and couple times for this issue and still no luck.

 

[chc4au]

That is copied from order.