992.2 GTS engine fault
3rd Gear
Joined: May 2025
Posts: 23
Likes: 31
Where is the member here that knows all about the lemon law? He had the 2023 GTS blow up on the way home from the dealership?? Porsche isn't just going to roll over and buy it back. Wonder why I can't find it?? Actually I don't.
Instructor
Joined: Jul 2022
Posts: 211
Likes: 420
From: North Central CT - USA
Oh man, bummed to hear that! These sorts of issues (I have only had one with a new car) are so frustrating because of the anxiety, the time it takes to diagnose/fix, and the amount of time you're left without your car. I had a BMW 335 (when they first went to the turbo engines) that was at BMW of North Haven CT for SEVEN WEEKS back in the late 2000's because they had to have engineers come in and analyze issues, get repeated parts, testing, etc. It was a nightmare, but I do have to say BMW NA stepped up and offered me some concessions. Anyway, best of luck and hope they get it right next time!!!
Track Day
Joined: Jan 2025
Posts: 15
Likes: 5
Took delivery of mine one week ago and dropped it back off last Friday. Had 20ish error messages (all orange) coming up including 4wd error (RWD only), lights, ABS, transmission (reverse not possible), etc. etc. after my first longer drive (c. 150km)
Stopped the car and errors went away for a while and after they returned and stayed. Called the dealership and they told me to bring it in and told me this "waterfall" of errors trigger each other and they have to diagnose. The car was driving fine except for the cruise control which was no longer working (no reduced power or anything like that).
Will be abroad for a while and only picking back up at the end of the month and hope they get it sorted. Car is brilliant and bloody fast... but fun did not last too long
Stopped the car and errors went away for a while and after they returned and stayed. Called the dealership and they told me to bring it in and told me this "waterfall" of errors trigger each other and they have to diagnose. The car was driving fine except for the cruise control which was no longer working (no reduced power or anything like that).
Will be abroad for a while and only picking back up at the end of the month and hope they get it sorted. Car is brilliant and bloody fast... but fun did not last too long
Rennlist Member
Joined: Jun 2024
Posts: 2,107
Likes: 3,348
From: Oregon
Man this is tough to hear. Especially since my own 4 GTS just got to the dealership and I plan to drive it home 1,000 miles as its first trip.
I asked the dealer to check for all the latest software updates, and CHARGE THE BATTERY. The batteries sit at ports for a month, at sea for a month, then often at another port or dealer for a month. Crucially, a maintainer does not charge the battery- only maintains the current charge level. A low battery, or even hiccups in the voltage levels seems to be the cause of so many "phantom" faults on the latest Cayennes with the same digital PCM. My own kicks out a cascade of 8 faults once every couple months. None of them real, and they seem electrical/battery related. From other users, the faults seem especially prevelant on the hybrids. The thread on it is here: https://rennlist.com/forums/cayenne-...my-2024-a.html
A possibly major recent development is a user took his '25 Cayenne to the shop and they said they had fixed TWENTY 2024 and early 2025 Cayennes with similar faults that had their batteries in coding in the factory software set to "lead-acid" instead of "AGM" (they use AGM batteries). Jury is still out on whether this fixes the phantom faults but it sure might explain some battery related weirdness. I really hope Porsche has a TSB out on this for the Cayenne soon if one dealership is seeing so many new cars with factory software set incorrectly.
I asked the dealer to check for all the latest software updates, and CHARGE THE BATTERY. The batteries sit at ports for a month, at sea for a month, then often at another port or dealer for a month. Crucially, a maintainer does not charge the battery- only maintains the current charge level. A low battery, or even hiccups in the voltage levels seems to be the cause of so many "phantom" faults on the latest Cayennes with the same digital PCM. My own kicks out a cascade of 8 faults once every couple months. None of them real, and they seem electrical/battery related. From other users, the faults seem especially prevelant on the hybrids. The thread on it is here: https://rennlist.com/forums/cayenne-...my-2024-a.html
A possibly major recent development is a user took his '25 Cayenne to the shop and they said they had fixed TWENTY 2024 and early 2025 Cayennes with similar faults that had their batteries in coding in the factory software set to "lead-acid" instead of "AGM" (they use AGM batteries). Jury is still out on whether this fixes the phantom faults but it sure might explain some battery related weirdness. I really hope Porsche has a TSB out on this for the Cayenne soon if one dealership is seeing so many new cars with factory software set incorrectly.
Rennlist Member
Joined: Mar 2019
Posts: 843
Likes: 909
From: Columbus, Ohio
Man this is tough to hear. Especially since my own 4 GTS just got to the dealership and I plan to drive it home 1,000 miles as its first trip.
I asked the dealer to check for all the latest software updates, and CHARGE THE BATTERY. The batteries sit at ports for a month, at sea for a month, then often at another port or dealer for a month. Crucially, a maintainer does not charge the battery- only maintains the current charge level. A low battery, or even hiccups in the voltage levels seems to be the cause of so many "phantom" faults on the latest Cayennes with the same digital PCM. My own kicks out a cascade of 8 faults once every couple months. None of them real, and they seem electrical/battery related. From other users, the faults seem especially prevelant on the hybrids. The thread on it is here: https://rennlist.com/forums/cayenne-...my-2024-a.html
A possibly major recent development is a user took his '25 Cayenne to the shop and they said they had fixed TWENTY 2024 and early 2025 Cayennes with similar faults that had their batteries in coding in the factory software set to "lead-acid" instead of "AGM" (they use AGM batteries). Jury is still out on whether this fixes the phantom faults but it sure might explain some battery related weirdness. I really hope Porsche has a TSB out on this for the Cayenne soon if one dealership is seeing so many new cars with factory software set incorrectly.
I asked the dealer to check for all the latest software updates, and CHARGE THE BATTERY. The batteries sit at ports for a month, at sea for a month, then often at another port or dealer for a month. Crucially, a maintainer does not charge the battery- only maintains the current charge level. A low battery, or even hiccups in the voltage levels seems to be the cause of so many "phantom" faults on the latest Cayennes with the same digital PCM. My own kicks out a cascade of 8 faults once every couple months. None of them real, and they seem electrical/battery related. From other users, the faults seem especially prevelant on the hybrids. The thread on it is here: https://rennlist.com/forums/cayenne-...my-2024-a.html
A possibly major recent development is a user took his '25 Cayenne to the shop and they said they had fixed TWENTY 2024 and early 2025 Cayennes with similar faults that had their batteries in coding in the factory software set to "lead-acid" instead of "AGM" (they use AGM batteries). Jury is still out on whether this fixes the phantom faults but it sure might explain some battery related weirdness. I really hope Porsche has a TSB out on this for the Cayenne soon if one dealership is seeing so many new cars with factory software set incorrectly.
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
9 Features and Characteristics That Only Porsche People Understand
Verdad Gallardo
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way
Joe Kucinski
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)
Verdad Gallardo
Porsche 911 GT3 S/C vs 718 Spyder RS: 10 Categories, One Winner
Joe Kucinski
This Builder Is Turning Heads With Its Slantnose 911 Creation
Verdad Gallardo
Porsche 911 GT3 Artisan Edition Pays Homage to Japanese Culture
Verdad Gallardo
Porsche Reveals Coupe Variant of the Electric Cayenne With a Fresh Look
Verdad Gallardo
10 Porsche Colors That Have More Personality Than Most People
Verdad Gallardo
Guntherwerks' Final Speedster Creation Is the Ultimate Porsche Restomod
Verdad Gallardo
3rd Gear
Joined: May 2025
Posts: 23
Likes: 31
Talked to my dealer last night, my car will have a plug to keep the battery charged! They want the big battery topped. Anyone get this information?? My 991 had the same plug. My car will be picked up tomorrow!! 6/4/25
Rennlist Member
Joined: Jun 2024
Posts: 2,107
Likes: 3,348
From: Oregon
I'd also strongly recommend a more powerful charger you actually clip to the battery under the hood once in a while, not just a maintainer. I got an Antigravity SC-10 (10 Amp) charger + maintainer and found that despite plenty of driving and frequent maintainer use with my NOCO Genius5, my batteries on both my P-cars were low and still accepted quite a bit of charge with the 10 Amp charger. Note: the GTS evidently has a lithium battery under the hood, while the base uses an AGM battery. The chargers/maintainers MUST be set to the proper battery type.
Three Wheelin'
Joined: Jan 2021
Posts: 1,492
Likes: 1,482
From: behind the 8 ball
I thought Porsche had confirmed that only the 12V battery could be maintained on a trickle charger and that the 400V battery is on a "closed" system and could only be charged by running the car in Sport+. Is that not accurate?
Last edited by Vicbastige; Jun 3, 2025 at 12:45 PM. Reason: typo
Rennlist Member
Joined: Jun 2024
Posts: 2,107
Likes: 3,348
From: Oregon
Three Wheelin'
Joined: Jan 2021
Posts: 1,492
Likes: 1,482
From: behind the 8 ball
Got it. The confusion for me is I thought with the .2 GTS, the 12V is no longer under the hood rather behind the seats, but it's the other way around. The 400V needs the motor or a flatbed to the dealer but he 12V can be maintained.
Drifting
Joined: Apr 2015
Posts: 2,063
Likes: 606
From: Pennsylvania
Rennlist Member
Joined: Oct 2012
Posts: 1,733
Likes: 1,971
From: Boston, MA
It's all thoroughly documented in the owner's manual.. what a quaint notion.
Links:
400v: owners manual
12: here
Links:
400v: owners manual
12: here
