gwaimie69

I have had a nightmare with this cayenne for the last 6 months, I work abroad and am only home for 2 weeks every 2 months, so trying to sort it has been really difficult, especially coupled with the fact there are no Porsche mechanics in my steak.

This is the issue.
1. Early last year I changed the wheels to 22", the garage that changed them did not turn off the air suspension and on return of vehicle the car suspension is fully inflated on the passenger side front and rear.
2. I purchased a dura metric cable and tried to recalibrate the suspension but passenger side would not take.
3. I was getting a error code relating to the front level sensor, this was changed. Still no luck.
4. After speaking with Charlie Burr I purchased and replaced both residual pressure sensors. The car levelled back out but then went back to the same settings as before.
5. Recalibrate again still won't take.
6. Battery died while I was away and all modules seem to have reset themselves, I was getting a host of fault codes, I cleared most but am left with an airbag module that won't communicate. And a dynavin head unit with no sound.
7. I replaced the level control module, but the new one wont accept the coding.
8. I am getting a gateway error now and error won't clear or communicate.

wrinkledpants

Did you recharge or replace the battery? Turning off auto level is a safety feature, not something required for maintenance. I think it's just chance that this happened when it was at the shop.

gwaimie69

I replaced the battery for a new one, the suspension was working fine before they jacked it up but as soon as they let it down it would not drop in passenger side

Sniffer

I`d be wanting to make sure that the voltage levels are within range before you get to deep into other possible solutions particularly as your car sits for long periods

For some reason German cars seem to like nice stable voltage as close to 12V as possible and the multiple error codes and other issues you are having are often the symptoms of not getting this

I know you changed the battery (did it sit for a long period since?) so while its not beyond the realms that it could be the issue its probably not, it would be worthwhile to check the output voltage from the alternator to see if thats within range (have heard of some alternators failing and dumping >55V onto the system which is equally as bad as low voltage if not worse)

I would also be looking at all the grounds and confirming their integrity as well as checking controllers for obvious issues (damp, corroded pins etc etc)

Sniffer

At any point in time did you jump start the vehicle?

If you did their is a chance you "spiked" the system and fried a controller

hahnmgh63

Also, if your gone regularly like that at all put the Pig on a good trickle charger. Running the battery down in any newer vehicle with many computer modules can induce multitudes of faults that can be a pain to clear. I highly recommend the "Battery Tender" brand but I also have one of the Porsche ones which are good but more expensive. The good ones are smart and will only trickle a small amount and cut off at a full charge. Cheaper ones will keep a small charge even when the battery reaches full and will shorten the life of your battery.

gwaimie69

Thanks for that guys, the suspension problem was the initial issue before the fault codes etc, I'm tearing my hair out with that one, and yes I did try to jump start it before the fault code issues

Sniffer

With the multitude of issues & codes that you are having I`d say there is a single common issue - bad ground, fried controller, voltage issue or similar at the root of it.

Theres no way you'd get that many individual items going south all at once.

Have you tried measuring the voltage to rule that out? Or even borrowing another (known/proven) good battery to temporarily bolt in? I`d also take a look at the loom to see if there are any obvious issues. Is there any chance that mice could have "visited" the car while its been parked up? They love wires!

gwaimie69

Yes I checked the voltage on the new battery and all is fine, I had it into the only Porsche specialist locally and he could not diagnose the issue. It's booked into Porsche stealer for mid April but I feel aggrieved to pay £160 an hour and have been told it could take a couple of days to put correct

Sniffer

Did you check it with load on? Various RPMs?

If the regulator is playing up it may be fine at idle (~12V) but go to something much higher as RPMs increase (the very thing that its designed to prevent)

J'sWorld

Turn the ignition on for at least 6 minutes and tell us the error msgs you get in the dash display.

gwaimie69

After switching on ignition the only error I get on the dash is the airbag light, but upon connecting the dura metric cable I am getting airbag error, gateway error and level control module error, it won't let me connect to any of these modules either

Shannon123

"gateway error and level control module error"

When I was attempting to lower my 955 with the durametric I had ALOT of trouble and these same errors......after reading more on it, I concluded that the Durametric and level control can be VERY FICKLE. Can't remember the exact sequence I used, but it took hours of fiddling, clearing, attempting to adjust the level etc before it finally adjusted correctly.

Lastly.....and again I don't have the sequence, many people were having the same trouble (gateway error and level control module error) and ended up adjusting through the dash commands.....you may want to Google that, but my guess is the Durametric is being fickle having in mind you have already replaced the sensors......or course it could be the compressor, but that seems unlikely since you stated it was only affecting certain wheel heights.

Sorry....wrote this in a hurry, but your remedy may very well be sorting the fickleness of the Durametric

J'sWorld

The gateway is integrated into the instrument cluster. Electrical in general ,but in this case CAN related faults are very difficult to diagnose. IMHO, multiple faults relating to Can based control units indicate you likely have a Gateway/electrical/wiring problem. In this case the Porsche system tester that the dealer has can save a lot of time if the tech is good. Unfortunaltly there are some things that just cannot be done on the Cayenne at home. Maybe something happened at the wheel place that they didn't want to own up to. You will probably never know. The level control system is complex and troubleshooting the CAN/Gateway systems requires special tools. PM sent.

gwaimie69

Well the car has now been transported to a Porsche main dealer and has been in 10 days, it's has been diagnosed and had all pressure relief valves replaced and is still the same!! I'm tearing my hair out here!! Surely someone knows what's causing this????