that_tg

I have searched for this and have not found this problem that I am having. The suspension is near new. I replaced the pump and front units (RMT) this past winter and all has been running great. Couple days ago I got a blinking yellow suspension light and the level selector options are grayed out. Now it has pumped up the bags on all 4 wheels and will not go down. Driving it is like an old jeep. It is much higher than when in lift mode.


Address 34: Level Control Labels: 4E0-910-553.lbl
Part No SW: 4E0 910 553 H HW: 4E0 907 553 F
Component: LUFTFDR.-CDC H06 4480
Coding: 0015510
Shop #: WSC 02314 785 00200
VCID: 285FE6A09B1A9C0181-807C

1 Fault Found:
01400 - Suspension Level Control
001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 2
Fault Frequency: 5
Reset counter: 119
Mileage: 253562 km
Time Indication: 0
Date: 2017.06.12
Time: 14:18:54


Any help would be great. I am very worried that the bags will bust.

MP4.2+6.0

No experience on this one and don't recall a post with all four corners pumped up. To me the logical place to look would be the valve block, which controls the air distribution to each wheel/shock. Sort of the "next" part too beyond what you have already replaced.

that_tg

Tried venting from this video


Mine would not move "bleed down"

I went to vent the front axle and it would not move.

Went to pump it up using the same procedure and it had a bit of room. The pump turned on and DARN-IT added some air. Like it was not hard enough.

dvs_dave

Check the level sensors on each wheel. This sort of behavior is typical when one or more of the linkages has become detached.

ltooz_a6_a8_q7

I would look for the air relief valve, I don't even know where the system release the air every time I turned off the engine and locked the car although I could hear the hissing sound.
If the level sensor is malfunctioning, can it be all front and back? Should they be independent?
There are 2 components to release the pressure from the 4 bags are the valve block and the exhaust valve in the pump. Relay to control air suspension is J403. Find and check J403, you may fix it.

haggisuk

Someone else recently had the same problem as you, he had used the charge axle procedure and over inflated the axle, and only way to get it down was to release the pressure from the strut airline connection manually.

If you are to attempt that please be sure to use a suitable jack under the car to support its weight so you don't have the car slam down onto yourself.

Also just for a sanity check, it was mentioned that the vent valve may not be working and that of course is a possibility, using the details from the video, login and try to vent the accumulator or rear axle, if you can vent either of those the the vent valve is ok. the fact you also can charge the front axle would lead me to believe the valves for them are also ok.

Check the level sensors like mentioned and try the above and report back.

flg8r90

Similar thing happened to me a few months ago.

https://www.audiworld.com/forums/a8-.../#post24955636

For me it was a very easy fix. Hope yours is the same issue. Make sure you don't burn out your pump. pull the fuse if it continues to run.

that_tg

DARN. I ran out to the car to check all the sensor arms. All are good and attached correctly.
Also did the venting procedure days ago and it will not let any air out of the system. I did try adding air to see if it would respond and sure ****. It added some to the front. I have ordered a new block and am waiting very impatiently for it to arrive.
Not sure what taking air out manually will help but I am willing to try it.

dvs_dave

You could try disconnecting the valve block wiring and manually apply 12v to the relevant pins to force the solenoids open for each corner, and also the vent solenoid to open. That will tell you if it's a faulty solenoid or an ECU issue.

that_tg

That makes sense but not sure I could pull that off. What pin? what is the ground so I do not short it? That is not my specialty. (wish it was)