cayenne s 3.0 hybrid fault code P055600 brake booster pressure sens

[911series]

Anybody know of this fault code p055600  on cayenne s 3.0 hybrid 2011 ?

[blakey81]

Just to the same error code on a Panamera hybrid. Any resolution to this issue? 

[Loren]

P055600 Brake booster pressure sensor vacuum

 

Fault setting condition(s)
- This detects a faulty electric brake booster vacuum pump
- This detects a brake booster vacuum that is too high, too low or implausible

 

Possible causes:
- Check brake pedal sensor adjustment
- Check whether vacuum is physically OK (leakage, etc.)
- Check wiring harness
- Check relay for vacuum pump
- Replace vacuum sensor
- Check DME control unit for correct program/data version
- Replace DME control unit

[Ramon P]

Hi my friend 

any clue were is the relay for the vaccum pump?

best regards 

[txhokie4life]

just got the same error on my 2015 Panamera s Hybrid.

 

Anybody figure out what the issue is?

 

 

[Halu17]

Hello Same problem on 2014 Panamera S Hybrid

 

Found this tech document on internet. 

 

Any one know what to check? I think is not a good solution to change the 3 complete vacuum lines. for only a leak o problem on one specific part. 

 

As the systems detects a vacuum problem it disable the electric mode and turn on the engine to ensure the mechanical vacuum pump to work and that way preserve vacuum for the brake booster. 

 

Edited October 31, 2021 by Loren
Removed copyrighted material

[JFP in PA]

That attached document came up "dirty" during a virus scan when downloading.

[Halu17]

Hello, it´s only a official Porsche  PDF, please find attached the screen shot of that document, hope some one know what is happening. 

 

Any one have documentation about what the Guided Fault Finding and Diagnosis Information says about this vacuum System? 

 

 

 

Edited January 13, 2022 by Loren
Removed copyrighted material

[j4nus]

Hi,

any solutions ? I have the same problem

[JFP in PA]

31 minutes ago, j4nus said:

Hi,

any solutions ? I have the same problem

Welcome to RennTech 

 

Loren listed all of them in his post above.

[j4nus]

Dear JFP,

Yes I read the different possibilites. I tested with the PIWIS and I got the same message but I'm not sure how to investigate further and it would be interesting to know how the other members solved it concretely.

[JFP in PA]

1 hour ago, j4nus said:

Dear JFP,

Yes I read the different possibilites. I tested with the PIWIS and I got the same message but I'm not sure how to investigate further and it would be interesting to know how the other members solved it concretely.

 

Pretty straight forward, you just follow the possible causes tree, eliminating them one at a time until you find the cause.  Even the absolute best diagnostic tools only provide a sense of direction of where to find the fault; none that I know provide a set of directions, which is where the technician's diagnostics capabilities come into play.

[Halu17]

Hello, just update that I have find the issue on my Panamera, after testing all posible components, it was the vacuum pump relay, that is located under the passenger seat. 
 

the relay itself sems to work fine but even when activating it’s solenoid, it was no connecting correctly the positive terminal for the vacuum pump. The contact was not good, so replaced the relay and all issues have gone. 
 

hope this could help you! 

[j4nus]

Ok thanks for the update.

I didn't know there was relay under the passenger seat.

I have already ordered this relay (number 370 here and located near the motor in a black box) and waiting for its delivery. 

[Halu17]

I think on cayenne maybe could be different location.

 

The relay I have changed is the atached one:

 

[Halu17]

for your reference the location is there:

 

 

[Halu17]

Also I have notice that since I have repair the relay, and hybrid mode is back to normal, when the car is Parked for a week even when charged is plugged , 12v battery gets full consumed even if the HV battery is at 100% 

 

I have also that problem before the P0556 fault code but since I have that error no more battery problems. 
 

before, when not plugged to charger and a week parked the HV battery also get to 0% and then the 12v. On the past the Dealer make test and try to reproduce the fault and they tell all is ok and there was no problem but that is not true as both battery’s keep discharging.

 

Anyone with same problems? Any clue?? 
 

 

[j4nus]

Thanks for the update.

I don't have this issue with the battery.

Do you let something connected on the cigarette lighter socket ? This could be linked to draw the 12v battery.

[j4nus]

On 7/23/2022 at 12:46 PM, Halu17 said:

I think on cayenne maybe could be different location.

 

The relay I have changed is the atached one:

 

 

Dear Halu17,

Thanks for the picture.

I got the relay 644 (it's the replacement relay for 100) and replaced the relay. It's located at the same place than yours.

Unfortunately I still got the same error message last week (once in 2 weeks after the replacement).

Probably another relay must be replaced but I don't find any documentation about the usage of the relay under the seat and under the hood.

Edited August 10, 2022 by j4nus
error

[Halu17]

 

6 hours ago, j4nus said:

Dear Halu17,

Thanks for the picture.

I got the relay 644 (it's the replacement relay for 100) and replaced the relay. It's located at the same place than yours.

Unfortunately I still got the same error message last week (once in 2 weeks after the replacement).

Probably another relay must be replaced but I don't find any documentation about the usage of the relay under the seat and under the hood.

Have you test vacuum pump working good, vacuum Lines, vacuum presure sensor and check valves??

 
if there is a vacuum leak the fault code would be the same 

[j4nus]

Hi Haly17,

Thanks for your message.

I did a visual check and did not see anything wrong. I can also hear the pump running.

The yellow warning is not popping up every time, only once every 2-3 weeks. If there was a real issue I imagine I would get the warning every time.

After diagnostic, I get P055600 (brake booster pressure sensor circuit range, P049100 secondary air injection system bank 1 insufficient flow, P049200  secondary air injection system bank 2.

Next time I will clear the codes, see what it coming again and try to start a diagnostic once I get the warning.

[George4]

Just to the same error code on a Cayenne 9Y 2019 hybrid. Any resolution to this issue? 

[hass777]

On 8/10/2022 at 9:36 AM, Halu17 said:

 

Have you test vacuum pump working good, vacuum Lines, vacuum presure sensor and check valves??

 
if there is a vacuum leak the fault code would be the same 

hello, did you resolve the issue? I have P057B code on P057B code and check engine light comes and goes, as well as the faulty hybrid system comes and goes. please let me know thanks

[Halu17]

1 hour ago, hass777 said:

hello, did you resolve the issue? I have P057B code on P057B code and check engine light comes and goes, as well as the faulty hybrid system comes and goes. please let me know thanks

Hello my solution for the issue was changing the electrical  vacuum pump relay under the passenger seat on the Panamera. 
 

hope this helps.

[Cahit Sekvan]

 

In the diagnosis of the 2012 Cayenn S Hybrid vehicle due to the P055600 brake pressure sensor meaningless signal error, the vacuum pump relay located in the engine compartment was found to be defective.