I have turned off the Auto Access Height feature on my vehicle, but when I start the car (usually after it’s been parked overnight), I notice that the air suspension system still raises. This doesn’t happen every day, and sometimes it doesn’t raise all four wheels at the same time (only front, only rear or sometime both front and rear).

Do you think this is normal behavior? Should I schedule a service appointment? If my vehicle is still under warranty, is the air suspension system covered under the warranty?

 

Yes, it is completely normal. No need to worry.

If you do have any air suspension issues, they will be covered under factory warranty. The factory warranty covers everything (as long as it isn't user-caused damage) for 4yrs/50k miles whichever comes first.

 

Usually, one thing happens for a reason. If air suspension acts after parking over night, there must be a reason, be normal or a leaking.
Nothing happens, likely because the system detects there is nothing changed over night, so no need to compensate.
Rising front, why? the system detects the front needs more air? and why it needs more air?
If all the cars are supposed to rise, say, the front, after parking over night, then I would guess the system itself is not "air tight over night for the front part".
I would think there is some leaking around the car and the system detects it and acts to do the compensation in the morning.
If this happens everyday, then I would think the car should be checked out by the dealer, if it is still covered by the warranty.
My two cents.

 

This will also depend on the space where you park normally. Is it a level surface?

 

I park inside the garage with level surface. my car was checked by dealer and They said "no fault found".

 

I've had this since I got my '22 and I'm closing on 4 years now. It's never gotten worse or led to any failures. I spoke to the dealership about it long ago and they even kept it overnight and checked it all over but did not find any issues. They actually said after looking it over they spoke with someone at corporate who told them it's normal for the active suspension.

I notice a lot of it seems to be related to temperature changes. On days where the temperature doesn't change a lot overnight, it often won't adjust. On days with very different temperatures between day and night it will usually adjust, especially when it's cooler in the morning.

 

When you said that, I realized it seems to be true — in Texas right now, the difference between daytime and nighttime temperatures can be as much as 30°F. And I’ve noticed that this has only been happening frequently recently, and it didn’t seem to occur a few months ago.