2012 A8 4H 34 level control coding
- Thread starter Autohaus Frankfurt
- Start date
Hi Uwe, thanks for the reply. Yes, all doors are closed, front windows open during the procedure. Fuel tank around 3/4 full.
One note is that I am not using a battery tender during the procedure.
Observed Symptoms:
My left front wheel is evidently low, my right front is evidently high.
Ther rear wheels are not as bad, with the left lower than right as well.
Here are some sensor readings that may be of interest. I can extract more.
One note is that I am not using a battery tender during the procedure.
Observed Symptoms:
My left front wheel is evidently low, my right front is evidently high.
Ther rear wheels are not as bad, with the left lower than right as well.
Here are some sensor readings that may be of interest. I can extract more.
Code:
Sunday,27,September,2020,02:21:40:56142
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64) HEX-V2 CB: 0.4513.4
Data version: 20200730 DS317.0
www.Ross-Tech.com
Address 34: Level Control (4H0 907 553 C)
02:21:31
IDE02942 Value of PWM signal left front vehicle height 38.21 %
IDE02943 Value of PWM signal right front vehicle height 46.71 %
IDE02944 Value of PWM signal left rear vehicle height 40.88 %
IDE02945 Value of PWM signal right rear vehicle height 39.19 %
IDE03057 Value of PWM signal left front shock absorber 50.00 %
IDE03059 Value of PWM signal right front shock absorber 50.00 %
IDE03061 Value of PWM signal left rear shock absorber 50.00 %
IDE03063 Value of PWM signal right rear shock absorber 50.00 %
IDE03123 Last measured pressure in left front pneumatic spring bellows 7.4 bar
IDE03124 Last measured pressure in right front pneumatic spring bellows 7.4 bar
IDE03125 Last measured pressure in left rear pneumatic spring bellows 4.6 bar
IDE03126 Last measured pressure in right rear pneumatic spring bellows 4.6 bar
Hi wanted to add some observations. I vented both axles in order to drop the car to its lowest level to observe the PMW signal from the level sensors. Here are the measured values:
Is it normal for the left side and right side sensors to read values inverted? That is left-side sensors decrease in value as the car drops, while right-side sensors increase in value. Is this normal behaviour?
Code:
IDE02942 Value of PWM signal left front vehicle height 27.47 %
IDE02943 Value of PWM signal right front vehicle height 73.48 %
IDE02944 Value of PWM signal left rear vehicle height 22.81 %
IDE02945 Value of PWM signal right rear vehicle height 67.70 %Is it normal for the left side and right side sensors to read values inverted? That is left-side sensors decrease in value as the car drops, while right-side sensors increase in value. Is this normal behaviour?
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I wouldn't think so, but I don't have access to a car with a suspension like that to confirm.
-Uwe-
Hi, I wanted to provide an update and my ride height situation
After many attempts to calibrate the vehicle and always getting stuck at "aborted - safety reasons" I took the vehicle to and Audi/Volkswagen certified shop. After a few hours of diagnosing the car the technician was unable to get past the same error I was having and was unable to provide a solution.
But I do have a positive update to share. Today, I decided to try an option on VCDS that I had never dared to try before. "Startup to Normal Level and Permanently Deactivate Level Control". Selected this from the dropdown, pressed "OK" and after like 30 seconds the function completed.
The result, the car is now leveled! The fault on the dash remains but at least the car is sitting at the same height between left and right.
Here are the readings from VCDS with this improved posture:
Note how the pressures readings are much higher on the left than on the right, and yet the car is leveled.
After many attempts to calibrate the vehicle and always getting stuck at "aborted - safety reasons" I took the vehicle to and Audi/Volkswagen certified shop. After a few hours of diagnosing the car the technician was unable to get past the same error I was having and was unable to provide a solution.
But I do have a positive update to share. Today, I decided to try an option on VCDS that I had never dared to try before. "Startup to Normal Level and Permanently Deactivate Level Control". Selected this from the dropdown, pressed "OK" and after like 30 seconds the function completed.
The result, the car is now leveled! The fault on the dash remains but at least the car is sitting at the same height between left and right.
Here are the readings from VCDS with this improved posture:
Code:
Address 34: Level Control (4H0 907 553 C)
18:28:26
IDE02942 Value of PWM signal left front vehicle height 36.50 %
IDE02943 Value of PWM signal right front vehicle height 58.61 %
IDE02944 Value of PWM signal left rear vehicle height 44.33 %
IDE02945 Value of PWM signal right rear vehicle height 48.51 %
IDE03123 Last measured pressure in left front pneumatic spring bellows 12.0 bar
IDE03124 Last measured pressure in right front pneumatic spring bellows 6.6 bar
IDE03125 Last measured pressure in left rear pneumatic spring bellows 7.5 bar
IDE03126 Last measured pressure in right rear pneumatic spring bellows 3.1 barNote how the pressures readings are much higher on the left than on the right, and yet the car is leveled.
An independent shop? Or a dealer?
The dramatic (~2:1) pressure difference between left and right bothers me. Why would so much difference be needed when the vehicle is level?
-Uwe-
It was an independent shop.
Yes, the pressure difference level sure surprised me too. It would be nice to have some reference values out of a healthy A8 as it may provide clues of what's happening. I also have not been able to confirm if the inverted behavior of the PWM values between the left and right sides is normal.
And unfortunately, after a few minutes of driving it later in the afternoon, the car reverted back to its bad posture, with the right side (front) being almost two inches higher than the left.
My current heights as measured from the floor to the fender are LF: 28.25", RF: 29.5", RL: 29.75" RR: 31.25"
I have been going through this same exact thing with a 2011 4H chassis. The difference is that mine blew up a bag (left / front) it kept going higher and higher like it wanted to compete in a monster truck show ..the "BAM!" replaced the bag.. no faults but rides right side 25mm lower then the left no matter how many time I adapt the suspension.. but for two days I get that error when I get to the sequence for "start up to level control" .. very frustrating and not profitable. Any luck with yours?It was an independent shop.
Yes, the pressure difference level sure surprised me too. It would be nice to have some reference values out of a healthy A8 as it may provide clues of what's happening. I also have not been able to confirm if the inverted behavior of the PWM values between the left and right sides is normal.
And unfortunately, after a few minutes of driving it later in the afternoon, the car reverted back to its bad posture, with the right side (front) being almost two inches higher than the left.
My current heights as measured from the floor to the fender are LF: 28.25", RF: 29.5", RL: 29.75" RR: 31.25"
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I know is old post but I had run in same situation on one 2011 A8 and anything I try it would reject Basic settings IDE03762.
Then I went to someone who has Legit ODIS try it and it was same thing, Did test plan and said coding on Level control module has to be done with SVM.
Went online and preform SVM coding , and after that all went OK.
So at end of coding besides coding I saw that parameters settings got change , So I think this is the problem which I think VCDS can not do it .
So if anyone has this code :
266752 - Control module not coded
U1013 00 [009] - - Confirmed - Tested Since Memory Clear
Most likely you have to do online SVM coding to fix parameters .
I really do not know what happen to this car ,they also chnage level sensor and try to do adaptation before I got car , possible they reset all adaptation which is NOTED at Ross-Tech wiki that should not be done.
Then I went to someone who has Legit ODIS try it and it was same thing, Did test plan and said coding on Level control module has to be done with SVM.
Went online and preform SVM coding , and after that all went OK.
So at end of coding besides coding I saw that parameters settings got change , So I think this is the problem which I think VCDS can not do it .
So if anyone has this code :
266752 - Control module not coded
U1013 00 [009] - - Confirmed - Tested Since Memory Clear
Most likely you have to do online SVM coding to fix parameters .
I really do not know what happen to this car ,they also chnage level sensor and try to do adaptation before I got car , possible they reset all adaptation which is NOTED at Ross-Tech wiki that should not be done.
Reset all adaptation values.
Was having issues with rear ride height, so I did the same dumb thing. How much is this going to cost me to fix at the dealer?
Was having issues with rear ride height, so I did the same dumb thing. How much is this going to cost me to fix at the dealer?
Last edited by a moderator:
So you ignored the warning that VCDS pops up when you try to do that?
Don't know for sure, but I would guess they will charge you for one hour of labor to pull the car in, connect to to their tool, and do an on-line session with the factory servers.
-Uwe-
There wasn’t a warning, but I obviously won’t touch that setting ever again. 1 hour of labor and all fixed. The suspension module acted like it was brand new and had no coding.