2019 Cayenne Lithium battery failure
03-22-2024, 11:33 PM
#46
Congratulations on your research, and your will to share this key battery solution that afflicts so many Porsche owners.!!
Not to mention Porsche's greedy multi-thousand dollar profiteering on defective battery parts, labor, and programming..
Keep us posted. I will be installing that solution as soon as it is available..
best regards..
Not to mention Porsche's greedy multi-thousand dollar profiteering on defective battery parts, labor, and programming..
Keep us posted. I will be installing that solution as soon as it is available..
best regards..
Last edited by kingstone; 03-22-2024 at 11:35 PM. Reason: missing quote
The following 4 users liked this post by kingstone:
03-23-2024, 03:09 PM
#47
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Yea thanks! And I did it! So far it works perfectly, the battery error message is gone and all systems go as normal including start-stop. I will continue to test it for a while, and if there are no problems, I will write a special post to introduce my experience to everyone!
What is needed is a modified negative lead, and an autoprogrammer to overwrite the code. I
04-27-2024, 04:15 PM
#48
Can you show images of what you bought and that you recieved? I was interested in what you wrote below...
I assume the Modified Negative Lead, it something similar to swapping out the Lithium Neg Ground strap to one from an AGM equipped Car.... but I wondering more about the Autoprogrammer to over-write the code. Is that something that is included in the kit you bought? Is it a little black box that connects to the terminals like they use on solutions for this type of thing in othere types of Cars such as McLaren where you can get a black box to allow a swap of any battery into a McLaren?
I assume the Modified Negative Lead, it something similar to swapping out the Lithium Neg Ground strap to one from an AGM equipped Car.... but I wondering more about the Autoprogrammer to over-write the code. Is that something that is included in the kit you bought? Is it a little black box that connects to the terminals like they use on solutions for this type of thing in othere types of Cars such as McLaren where you can get a black box to allow a swap of any battery into a McLaren?
Actually, the OBD Programmer is a blue box. What matters is I think it could be a microcontroller or something similar. I have post a whole story about this you may be interested in:
https://rennlist.com/forums/cayenne-...l#post19408056
And here is the website I built recently introduced the kit in detail:
https://www.allbuylow-autoparts.com/
Last edited by kingstone; 04-27-2024 at 04:17 PM. Reason: missing quote
04-29-2024, 08:15 PM
#49
Instructor
Phew. Now the worst part of the cayenne has a fix. Back to work folks, nothing to see here!
04-29-2024, 10:46 PM
#50
Actually, the OBD Programmer is a blue box. What matters is I think it could be a microcontroller or something similar. I have post a whole story about this you may be interested in:
https://rennlist.com/forums/cayenne-...l#post19408056
And here is the website I built recently introduced the kit in detail:
https://www.allbuylow-autoparts.com/
What's the life expectancy of the latter Antigravity battery on the Cayenne?
thanks..
04-30-2024, 12:12 PM
#51
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If the kit works you will be able to use AGM or even the Porsche or Aftermarket Lithium Batteries like ours. So that is cool, but I'm still a little on the fence from the perspective of the Porsche Dealers and what they might say. We have dealt with the silly nonsense from Porsche Dealers for YEARS saying our battery won't work in Porsches and other utter falsehoods they love to tell Customers against anything aftermarket. They can't say anything to us because we use the same Lithium Cells they do for their cars, yet they continue at dealerships to claim it won't work. They also will tell you "it voids your warranty" which is another falsehood. So a word of advice, just make clear you are not doing something with the new kit that will have Porsche saying it screws up your Cayenne's or overrides a built in system. I bring this up for Kingstone and others, test the product, see if it changes anything Porsche has done, or overrides something... because the Porsche dealers will always blame any aftermarket product for any issues. Being blunt, we were offered a kit like this for the McLarens and Porsches, but didn't want to bring it in only because if anything goes wrong the customer will blame us or Porsche will blame us so we stayed out of that side of the game and let other companies deal with that side. I know the McLaren one is working on that side. But you will only hear us say....." change the Ground Cable..." because that stays in the Porsche domain so they can't say you messed with their system. But great if it works.
Last edited by Antigravity; 04-30-2024 at 01:49 PM.
05-13-2024, 11:58 PM
#52
05-14-2024, 11:45 AM
#53
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06-07-2024, 08:54 PM
#54
Burning Brakes
This is the second time this problem has occurred to me in a year! The first time there was a recall from the Porsche dealer to resolve the matter, but this time they refused to do it on the grounds that it had already been done to me once. The principle of the battery alarm is indeed caused by a design flaw in the PCM module. I am not sure if they did it on purpose cuz replacing the battery with a new one does not mean that this error will not happen again. And it will force me to buy a new battery again and again as long as I have a Cayenne.
Being an engineer I decided to find the solution elsewhere. Replacing lithium batteries with AGM lead-acid lithium batteries is theoretically a feasible solution. Unfortunately, this is a new solution and lacks programming tools, and has not been verified over time. I guess its confidence comes from the new Cayenne in 2024 (the new Cayenne is replaced with an ordinary battery).
Here is the best part. I unexpectedly discovered in China that they seem to have successfully implemented this modification solution and marketed it on a large scale! What is needed is a modified negative lead, and an autoprogrammer to overwrite the code. I tried my best to order these two items from China half month ago, and according to the express delivery records, they are estimated to be delivered tomorrow.
I plan to send these two things to the body shop that I am familiar with to see if they can really be modified successfully.
If it does work out, I'll have fixed the whole thing for just a few hundred bucks! And will get rid of this stupid battery design once and for all! Coincidentally, I am working for an international trading company. I reported this situation to my superior. If there are no legal problems, it is possible that we can introduce this technology and distribute it to auto body shops across the United States. I even suggested that engineers in China to develop a personal version so that people could solve the problem in their own homes. Guess what? They said they would give it a try xd
Being an engineer I decided to find the solution elsewhere. Replacing lithium batteries with AGM lead-acid lithium batteries is theoretically a feasible solution. Unfortunately, this is a new solution and lacks programming tools, and has not been verified over time. I guess its confidence comes from the new Cayenne in 2024 (the new Cayenne is replaced with an ordinary battery).
Here is the best part. I unexpectedly discovered in China that they seem to have successfully implemented this modification solution and marketed it on a large scale! What is needed is a modified negative lead, and an autoprogrammer to overwrite the code. I tried my best to order these two items from China half month ago, and according to the express delivery records, they are estimated to be delivered tomorrow.
I plan to send these two things to the body shop that I am familiar with to see if they can really be modified successfully.
If it does work out, I'll have fixed the whole thing for just a few hundred bucks! And will get rid of this stupid battery design once and for all! Coincidentally, I am working for an international trading company. I reported this situation to my superior. If there are no legal problems, it is possible that we can introduce this technology and distribute it to auto body shops across the United States. I even suggested that engineers in China to develop a personal version so that people could solve the problem in their own homes. Guess what? They said they would give it a try xd
Congratulations on getting the kit together.
06-10-2024, 03:20 AM
#55
Do you know actually what is being modified in the car's software? Is it simply the alternator's charge rate and charge voltage curves to make it AGM compliant? Where is this code, in the ECM ? Or is it more complex than that? For instance, with the lithium battery, there was reportedly a safety switch built into the neg lead that kept the battery from being drawn down less than 10V? or something. Is that a stand-alone threshold switch on the lead itself? Is there also a section of code in the vehicle that wants to keep up a running communication with the status of this voltage/switch state and process a signal from it once the threshold low level is reached, to warn the driver via the impending doom battery status that folks post pictures of.
Congratulations on getting the kit together.
Congratulations on getting the kit together.
According to my understanding after communicating with the technicians of this kit, there is no direct communication between the voltage/switch of the Lithium battery and the onboard computer. The computer just read the battery voltage information. A fact is if the battery voltage/charging switch of the Lithium is closed, it would only display "battery low" in the dashboard instead of "charging switch closed" or other information, which is consistent with my inference. As for the code, the manufacturer only claims that the data channel was opened by overwriting the original car code with the computer data of the 2024 Cayenne. I think it should be a data mapping method to make the onboard computer think it is communicating with a lithium battery. This doesn't feel like a data mock, as the dashboard does monitor a real-time reading of the battery.