I have a 2015 991.1 Turbo S. After a long holiday break, I didn't drive the car, and the battery got fully discharged. I got a jump start, and after that, I drove for about an hour, and the PCM worked totally fine. But once I shut the car off, it wouldn't start again, so I ended up going to the Porsche dealer to replace the battery.

Here's the weird part: right after the battery replacement, the PCM started rebooting repeatedly, both while driving and even when parked. It makes a loud "pop", shows the Porsche logo, then returns to the home screen. If I'm using Bluetooth, it disconnects when it reboots.

I brought it back to the dealer. They said they tried a PCM software update using a disc, but it failed, and on the repair notes, they wrote "internal hard drive failure" and quoted $7k+ to replace the PCM.

Has anyone seen something like this and actually fixed it? I'm hoping it's something software-related, so I don't have to replace an expensive PCM unit if it's not necessary. Any suggestions on what to check next would be really appreciated.

 

Yes, you may need a new PCM.
Happened to my car randomly, not because of any changes to the car, the pcm would reset at exactly 2 min 42 seconds over and over.
My local Porsche dealer had it covered for me under a known recall and replaced it with a refurbished OEM part.
That may be an option for you depending on your dealer.

 

There are PCM replacements that have gotten pretty good. And are relatively inexpensive.

 

The hard drive failure issue has been well documented and there is a thread over on the regular 991 forum. My understanding is that you can buy a replacement solid state hard drive and the replacement is fairly straightforward. If you're relatively handy, you can possibly fix it yourself for a small amount.

 

Just started having issues with my 2015 911, does anyone have a cloned drive for sale that would work for mine?

 

ive helped many people with this on RL. This is caused by a failed hard drive in the PCM. After you replace the hard drive in your pcm, it will all go back to normal, and it's very easy to replace this drive. i ship them out daily.