2024 Duramax/Air suspension malfunction?

[chrisbusnut]

I have a 2024 Yukon Denali with the Reserve Package, which includes air suspension. I've noticed that when I park overnight, the front air shocks seem to deflate, causing the vehicle to sit low in the front (but normal in the rear). I checked and do not have the setting engaged that lowers the vehicle when parked for easy entry/exit. I previously had a 2022 Tahoe Z71 that also had air suspension, and never had this issue. This Yukon has less than 500 miles on it. I'm wondering if there is an air shock leak? When I start it, the shocks inflate to normal height, and seem to operate normally. I don't hear any air escaping when I turn the engine off. Has anyone experienced this?

 

[WalleyeMikeIII]

Better get it in to the dealer. Clearly a problem.

 

[mplunk]

Definitely a problem. Could be a leak, or could be a tech issue causing just the front to go to entry/exit height.

 

[WalleyeMikeIII]

FWIW, I had not used Entry/Exit height, but I broke my leg on black Friday, and Entry/Exit has been most helpful!!!

 

[chrisbusnut]

I cycled the easy entry/exit setting on for a day, then turned it back off. I'll see if that makes a difference. The last thing I'm want to do is take the vehicle into the dealer with only 500 miles and a few weeks of ownership under my belt, but if it's what I have to do, then I'll do it. I'm also trying to figure out what's going on with the stinky exhaust that I'm experiencing sometimes. It almost smells like unburned fuel, but maybe it's in regen. I have a Sierra HD with the Duramax and have not had that issue.

 

[WalleyeMikeIII]

I cycled the easy entry/exit setting on for a day, then turned it back off. I'll see if that makes a difference. The last thing I'm want to do is take the vehicle into the dealer with only 500 miles and a few weeks of ownership under my belt, but if it's what I have to do, then I'll do it. I'm also trying to figure out what's going on with the stinky exhaust that I'm experiencing sometimes. It almost smells like unburned fuel, but maybe it's in regen. I have a Sierra HD with the Duramax and have not had that issue.

Do you have the Duramax? It may indeed be the regen...I will say mine stunk for the first 2000 or so miles, burning off oil and coating on parts that had yet to be hot, I imagine...doesn't stink anymore.

 

[chrisbusnut]

Do you have the Duramax? It may indeed be the regen...I will say mine stunk for the first 2000 or so miles, burning off oil and coating on parts that had yet to be hot, I imagine...doesn't stink anymore.

Yes, it's the Duramax. The burning coating smell you described was present for the first week or so, but has since gone away. I experienced the same thing when I bought my 2022 Tahoe (6.2). I've made a service appointment for Wednesday for the suspension, and will mention the odor to them as well.

 

[Texdive]

I have a 2022 Z71 with the air suspension and it does exactly what you are describing. I asked the dealer to look at it when I had the oil changed and they didn’t see anything wrong.

Please let us know what you find.

 

[WalleyeMikeIII]

Been thinking about this a bit more...are you parking it on a flat surface? If it were on an incline, it may be lowering the front to attempt to level the vehicle...

 

[Texdive]

On mine it is in the garage so flat. Have had it happen at many places over night and all have been flat no inclines or declines.