2012 991.1 same issue as we are all having. A very annoying styrofoam sounding squeak that sounds like it is being emitted from under the dash area. My sound was indifferent to tank fuel level, just horrid.
Fix? I popped off the cowl in the frunk and went to town with a can of silicone spray, hit everywhere my hand/can could reach focusing on the firewall area. Some spots I could not hit directly so sprayed a ton of lube along the firewall and let it seep down. Silicone spray is great in that sense, it doesn't leave a dripping mess that other more popular lubes like WD40 possibly would. I also sprayed the upper strut mounts and let it seep in good and proper.
Drove it 30 mins later and the squeaking has gone, so it was either or my upper strut mounts or the tank pads. Whatever it was, happy have it gone.
This thread was incredibly helpful to say the least, thank you fellow R-listers....

 

Hey guys - I'm having what I think is the same issue and it is driving me absolutely insane. My car is CPO and due to be at the dealer in a week. I was able to capture the sound:


Did yours sound like this by any chance? Is this how the fuel tank pad issue sounds like?

I am not convinced my issue has to do with the cowl in the frunk as I popped it off and drove without it so see if made any difference. No luck.

 

Def the same sound. Do the same as I did and it'll be gone. Spray the heck out of with any lubricant you can get in there, silicone is best as it won't react with the foam pads possibly.

 

Ok. Thank you! I do have a can of silicone spray. Will first pay more attention if the sound is less prevalent when the fuel level drops. It's definitely temperature sensitive as with the very hot weather we are getting in Toronto recently it became louder and pretty much 100% of the time there. I gotta noticed it last fall, but then with the winter it disappeared.

To others that have gone through the service bulletin 1403, how does this noise I posted above compare to what you had?

 

Hi everyone,

My car has the same symptoms as described in the messages above: started hearing some squeaking, styrofoam like, with a full gas tank while driving to Italy on a hot summer's day. I had read this thread a few days before, and was very thankful for it, because I would have never guessed that noise came from the frunk!
I bought a can of silicon spray and tried to apply against different parts of the firewall, based on what I read here and where I understand the gas tank to rest against the firewall.
Is anyone able to point out more specifically where to spray some once the cowl is removed so that I have the best chance of success?

 

The cost is to be picked up by the owner as despite the fact the warranty covers the fuel system, this is not considered to be a fuel system problem. Here in Canada, the dealership wanted $2600 + tax. I suppose I'm going to town with silicone spray as well....

 

Ok, so I followed the suggestion from PSGA4 and "went to town" with silicone spray. I used a full bottle against the firewall, soaking as much as I could and letting the excess run down against the firewall. I sprayed everywhere I could and my hand/can would reach. I read somewhere people talking about a "carpeted area" but ...I didn't see any in my case.

Also, since I was at it, I sprayed a bit on the cowl that covers that area. I found there is a piece of foam under that cowl that ends up in contact the battery (or the battery bracket) that makes a similar squeaky sound. I also sprayed a bit at the rear end of the cowl, where it connects with that plastic piece that runs under the windshield. I know my issue wasn't the cowl as I drove without it and still hear the squeak. But...doesn't hurt as the theme is to go to town with some silicone.

I'm not sure if it makes a difference or not but my tank was not full when I sprayed the silicone. Reason I say that is because if the culprit really is the tank foam pads, and it only makes the noise when it's full and/or hot days (which was my case), it means the tank is expanding and getting in touch with something. So not having it full when you spray silicone may help it get to where it needs to go.

After I emptied a full can (mine was actually 3/4s full), I went for a ride and hit many bumpy roads. No squeak could be heard. I filled up the tank after that and continued my way on bumpy roads. Seems to be quiet now. Fingers crossed it's finally gone and I can enjoy driving my baby again. If I hear this silly squeak again I'll report back.

Good luck and hopefully this helps, while not giving you a very specific direction...

Cheers

 

Thank you for taking the time to share, that's very helpful! I think I was way too reasonable in my first application, I understand now that given the configuration, I need to basically empty the can in there and let it seep.
I'll give it a go and report back.

 

We drove 400 miles from Tuscany to southern France today, and yesterday's more generous attempt seems to have done the trick.
Zero noise in the cabin despite hot temperatures and a full gas tank when we left. Me and my wife were very glad!
Thank you to everyone who contributed to identifying this issue and coming up with a cheap and easy fix!

 

Fantastic! Happy it resolved!

I have challenged the response from my local dealer about not covering bulletin 1403 under my extended warranty directly with Porsche Canada HQ. I have a close friend that works for Porsche Canada. They decided to look into it closer. If I get a response that they will cover under warranty I'll report back to this forum. Only problem for them now will be dealing with the greasy mess they are going to be left with after I emptied a full bottle of silicone spray. 😂

 

FYI Mine’s under CPO warranty (in the US, not Canada) and I tried to have it covered last summer and they denied coverage.

Same exact noise, same exact problem.

 

So, I sprayed by suspension mounts and it seemed to go away but now its back. It sounds like its coming from my Targa top. Its not the pop flex sound that occasionally happens with the top that the dealership told me was the top flex. Its that jittery sound that so many of us hear. If its coming from my Targa top, what do you suggest? Thanks for your feedback, all!

 

Why did they deny CPO coverage?

 

For some convenient reason, this is treated as a "squeaky sound" issue and not for the real fact that it's the failure of the foam that separates the fuel tank from the firewall. And "squeaky sound" issues are not covered under warranty.

I'm any case. After spraying a good load of silicone against the firewall I have not had the issue again...so mine will stay like that for now.

 

Not really sure to be honest about the targa top as my issue was indeed the fuel tank. Are you sure yours is the targa top? This squeaky sound drove me absolutely mental and I could swear it was coming from the steering wheel column until I found this thread. You may think it's coming from the targa top as I suspect that is very close to your ear, but it could still be the fuel tank. Have you noticed if the issue occurs in hot and/or cold weather? And if the fuel tank is full or not? The issue with the fuel tank seems to occur only when the fuel tank is full and under warm weather conditions.