Air suspension soft fault

[gk1]

This is more of a curiosity than any sort of serious problem I feel.
I got this suspension soft fault the other day.
453633 - Pressure Sensor for Level Control
C1031 F1 [008] -Residual Pressure for Lowering Rear Axle too Low.

Couple things:
I don't drive my car much any more, but it does live on a ctek battery charger so doubtful there is a battery issue.
I could see residual pressure "bleeding" over time, but I'd image it would take quite a long time. (assuming no leaks)
I am VCDS lowered -10mm.
Never any visual indications of any issues (sagging) or warning lights.

I've cleared it and will watch for it to come back so no biggie, but I'm more curious of where this suspension pressure sensor is located. I don't see reference to a separate pressure sensor. Is it integrated into the compressor pump or distribution valve block, if it was in the air tank I'd think it would be listed separately since it would be attached to the tank?
If anyone knows where it is or has pictures of it that would be great for future reference. Thanks.

[Niranjan]

There is a pressure sensor in the valve control block, which shows the pressure for the each wheel bellow, when the valve operates, this value is then stored for control. This can be due to faulty valve control block or just a loose/corroded electrical connector to it. First try to clean the connector if it's bad and reset the fault.

[gk1]

There is a pressure sensor in the valve control block, which shows the pressure for the each wheel bellow, when the valve operates, this value is then stored for control. This can be due to faulty valve control block or just a loose/corroded electrical connector to it. First try to clean the connector if it's bad and reset the fault.

Thanks.
Yeah I sort of figured out that the sensor is built into the block. I also have already cleaned the connector and cleared fault. It does not happen very often. I also suspect maybe it only happens when parking on an incline. Not that often.

[Youngmin]

453633 - Pressure Sensor for Level Control
C1031 F1 [008] -Residual Pressure for Lowering Rear Axle too Low. How did you solve this trouble code? I have lowered the leveling by about 13cm, and this fault code has been continuously generated and restored to its original state, but the fault code is continuing to occur. How do you clean up?

[Youngmin]

<font class="papago-parent"><font class="papago-source" style="display:none;">

453633 - Pressure Sensor for Level Control
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453633 - 레벨 제어를 위한 압력 센서
</font><font class="papago-parent"><font class="papago-source" style="display:none;">C1031 F1 [008] -Residual Pressure for Lowering Rear Axle too Low.</font>C1031 F1 [008] - 리어 액슬 하강을 위한 반복 압력 너무 낮음</font><font class="papago-parent"><font class="papago-source" style="display:none;"> How did you solve this trouble code?</font> 이 문제 코드는 어떻게 해결하셨나요?</font><font class="papago-parent"><font class="papago-source" style="display:none;"> I have lowered the leveling by about 13mm, and this fault code has been continuously generated and restored to its original state, but the fault code is continuing to occur.</font> 나는 레벨링을 13mm 정도 낮췄고, 이 고장 코드는 지속적으로 생성되어 원상 복구되었지만 고장 코드는 계속 발생하고 있다.</font><font class="papago-parent"><font class="papago-source" style="display:none;"> How do you clean up?</font> 청소는 어떻게 해?</font><font class="papago-parent"><font class="papago-source" style="display:none;">

</font>

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[Youngmin]

453633 - Pressure Sensor for Level Control
C1031 F1 [008] -Residual Pressure for Lowering Rear Axle too Low. How did you solve this trouble code? I have lowered the leveling by about 13mm, and this fault code has been continuously generated and restored to its original state, but the fault code is continuing to occur. How do you clean up?

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[Youngmin]

Residual Pressure for Lowering Rear Axle too Low. How did you solve this trouble code? I have lowered the leveling by about 13mm, and this fault code has been continuously generated and restored to its original state, but the fault code is continuing to occur. How do you clean up?

[gk1]

I have not solved this issue and cleaning the connector did not help.

I can only guess that since my driveway is on an incline that occasionally when I park there (with the car running) to take out the trash bins that it seems to trigger the fault.
i.e. Car running on inclined driveway, I apply parking brake, get out, take trash bins to the curb, and get back in and move car into level garage. Then occasionally it triggers the fault.
So I know when opening the door sometimes the car self levels (I can hear it) therefore my only guess is when on the incline and exiting the car it attempts to self level and drops the pressure below the sensor's alert threshold in an attempt to level on the incline. Again it is my only guess I have no proof. I am also VCDS lowered but only 10mm and I don't know if that has anything to do with this.
I can't say I notice any other issues (no sagging, drivability or other faults)

I even do not notice the issue triggered if I park on the incline, shut the car off, then exit and wash my car on the inclined driveway

Can you tell if your fault only triggers when on an incline too?

[Youngmin]

No, the symptoms appear immediately when parked flat and the engine is cycled. You have ordered the current valve block.

[gk1]

No, the symptoms appear immediately when parked flat and the engine is cycled. You have ordered the current valve block.

Oh it sounds like yours is more frequent fault than mine.
I did not go for a new valve block it is very expensive at $450 and I don't feel it has really failed yet and I am not willing to chance one of the ebay knockoffs.

I believe this is the part if you want to give it a shot 4H0616013C

[Youngmin]

Fortunately, I ordered it because I heard there was a regeneration. I'm trying to do everything I can because the air suspension is not working due to the continuous failure code.

[gk1]

Fortunately, I ordered it because I heard there was a regeneration. I'm trying to do everything I can because the air suspension is not working due to the continuous failure code.

Ah I see... a supersession... I assume your old part is 4H0616013A or B
OK yeah it seems yours is in much worse shape. Let me know if that fixes the issue for you.

[SteveO34]

I suggest you spray the air hose connections to the valve block/pressure sensor unit and the hose connections to the air springs with soapy water and see if there's a slow leak. That DTC doesn't sound like it would be the result of an air leak but it's easy to check so it's worth trying. It sounds like the valve block unit is the problem.

I had numerous problems with my air suspension system over the last 3 years and ended up replacing almost all of it (except the front air springs & the air reservoir). I got most of my parts from www.air-suspension-shop.com. They have really good quality stuff and about 1/2 the price of OEM. They sell on eBay too with free shipping.

[infinitereality]

453633 - Pressure Sensor for Level Control
C1031 F1 [008] -Residual Pressure for Lowering Rear Axle too Low. How did you solve this trouble code? I have lowered the leveling by about 13cm, and this fault code has been continuously generated and restored to its original state, but the fault code is continuing to occur. How do you clean up?

I assume you mean you lowered it 13mm and not 13cm, right? Safe to assume lowered via VCD?

If so, I know all cars are different so I wonder if for your car you are too low? Since it only takes 10min, I'd redo the lowering with only 10mm and see if that fixes it. If it does, you can try to go a little more low until.

For what it's worth, my car is on the cusp of being too low. Every month or so I'll get the air suspension fault while driving. I can pull over, turn car off and back on and it'll be cleared. IF I drive off it has a 50/50 shot of coming back, but I can put in dynamic and back to normal and it's good for another month or 2.