2019 Cayenne Battery
#316
Just to save for the future in case the link goes down:
Porsche TSB WMJ9
Make:PorscheNumber:WMJ9Title:Reprogramming control unit gateway (battery sensor)Date:6/13/2022Models:- 2018-2021 Cayenne
- 2019-2021 Cayenne S
Last edited by FlyPenFly; 08-19-2023 at 04:49 AM.
The following users liked this post:
chassis (08-19-2023)
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chassis (08-19-2023)
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George718 (08-19-2023)
#319
So, those people with the battery error message do not need a new battery, but just need to have their controller/sensor software reprogrammed.
I hope those people with these battery false error messages/issues weren't suckered by their dealers to pay $1000's of dollars for a new battery.
I see how and why the 3rd party companies repairing the LiFePO4 batteries were changing the controller/sensor and reprogramming it.
I hope those people with these battery false error messages/issues weren't suckered by their dealers to pay $1000's of dollars for a new battery.
I see how and why the 3rd party companies repairing the LiFePO4 batteries were changing the controller/sensor and reprogramming it.
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ArcticFox (08-19-2023)
#320
40,871 cars over 3 years. USA production only? Wonder if the other production has AGM batteries?
The memo in dated June 2022. So are dealers taking the opportunity to unnecessarily replace an expensive battery?
The memo in dated June 2022. So are dealers taking the opportunity to unnecessarily replace an expensive battery?
Last edited by kenv; 08-19-2023 at 12:17 PM.
#321
Clearly this is just part of a planned obsolescence campaign for the battery to force folks to replace them out of warranty. In the case of the recall it seems that the bug is causing it to go off during the warranty period which is the opposite of what Porsche wants.
The following 2 users liked this post by matthewr87:
ArcticFox (08-19-2023),
Larson E. Rapp (09-11-2023)
#322
Clearly this is just part of a planned obsolescence campaign for the battery to force folks to replace them out of warranty. In the case of the recall it seems that the bug is causing it to go off during the warranty period which is the opposite of what Porsche wants.
#323
Well I'm at a crossroads about the whole car with this one...
I have a base with all the options, love the car. I have about 3k miles to decide if I want to keep the car and buy the Fidelity warranty which gives me 100k miles / 7 years of bumper to bumper coverage (except the battery lol) or trade it in for another car.
I just DO NOT want to pay $1,000 / year for a battery in case this stupid thing fails again and you just have to keep swapping it out every 4 years for $4k.
I have a base with all the options, love the car. I have about 3k miles to decide if I want to keep the car and buy the Fidelity warranty which gives me 100k miles / 7 years of bumper to bumper coverage (except the battery lol) or trade it in for another car.
I just DO NOT want to pay $1,000 / year for a battery in case this stupid thing fails again and you just have to keep swapping it out every 4 years for $4k.
#324
lets hope for an AGM solution for Sub $1k
The following 3 users liked this post by George718:
#325
Instructor
“Battery Low Service Necessary”
Yesterday morning, my 2019 Cayenne with 10k miles, delivered new in December of 2018 popped up the “Battery Low Service Necessary” light.
I have read most of this forum thread. Lots of data, thank you.
I drove to a family thing about 30 minutes of highway driving, two hours later, started no problem, drove 30 min home.
With my voltmeter, I checked voltage last night and this morning on the posts under the hood. Both times voltage was 13.5v.
I pulled out my LiFePO4 capable battery charger and hooked it up to the posts under the hood. Within 10 minutes, the charger was indicating a fully charged battery, so I really don’t think I have a battery problem.
I printed out the Porsche Factory bulletins on this thread, including the one about the software upgrade.
Questions - Is there a way for me at home to clear the yellow warning indication of “Battery Low Service Necessary?”. Maybe by disconnecting both the LiFeP04 starting battery and the battery in the cargo area?
If not, is my next step to contact Porsche service about software upgrade?
thanks!
I have read most of this forum thread. Lots of data, thank you.
I drove to a family thing about 30 minutes of highway driving, two hours later, started no problem, drove 30 min home.
With my voltmeter, I checked voltage last night and this morning on the posts under the hood. Both times voltage was 13.5v.
I pulled out my LiFePO4 capable battery charger and hooked it up to the posts under the hood. Within 10 minutes, the charger was indicating a fully charged battery, so I really don’t think I have a battery problem.
I printed out the Porsche Factory bulletins on this thread, including the one about the software upgrade.
Questions - Is there a way for me at home to clear the yellow warning indication of “Battery Low Service Necessary?”. Maybe by disconnecting both the LiFeP04 starting battery and the battery in the cargo area?
If not, is my next step to contact Porsche service about software upgrade?
thanks!
The following users liked this post:
chassis (08-20-2023)
#326
Rennlist Member
Yesterday morning, my 2019 Cayenne with 10k miles, delivered new in December of 2018 popped up the “Battery Low Service Necessary” light.
I have read most of this forum thread. Lots of data, thank you.
I drove to a family thing about 30 minutes of highway driving, two hours later, started no problem, drove 30 min home.
With my voltmeter, I checked voltage last night and this morning on the posts under the hood. Both times voltage was 13.5v.
I pulled out my LiFePO4 capable battery charger and hooked it up to the posts under the hood. Within 10 minutes, the charger was indicating a fully charged battery, so I really don’t think I have a battery problem.
I printed out the Porsche Factory bulletins on this thread, including the one about the software upgrade.
Questions - Is there a way for me at home to clear the yellow warning indication of “Battery Low Service Necessary?”. Maybe by disconnecting both the LiFeP04 starting battery and the battery in the cargo area?
If not, is my next step to contact Porsche service about software upgrade?
thanks!
I have read most of this forum thread. Lots of data, thank you.
I drove to a family thing about 30 minutes of highway driving, two hours later, started no problem, drove 30 min home.
With my voltmeter, I checked voltage last night and this morning on the posts under the hood. Both times voltage was 13.5v.
I pulled out my LiFePO4 capable battery charger and hooked it up to the posts under the hood. Within 10 minutes, the charger was indicating a fully charged battery, so I really don’t think I have a battery problem.
I printed out the Porsche Factory bulletins on this thread, including the one about the software upgrade.
Questions - Is there a way for me at home to clear the yellow warning indication of “Battery Low Service Necessary?”. Maybe by disconnecting both the LiFeP04 starting battery and the battery in the cargo area?
If not, is my next step to contact Porsche service about software upgrade?
thanks!
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thinkiwanta928 (08-20-2023)
#327
Hi LSR,
Just wondering if you can describe step-wise how you reached to the battery compartment under the passenger footwell in the vehicle?
Is it as simple as removing 2 visible bolts in the passenger footwell? Thanks in advance.
PS: I don't own a Cayenne and looking for instructions how to gain access to the footwell to take a peek at the battery type myself, before any vehicle purchase.
At the moment, I am looking at the used car market in hope to find one with an AGM battery installed, I was hoping perhaps some 2020 Cayenne models may already have AGM instead of LiFePO4 batteries. (Anyone know?)
Just wondering if you can describe step-wise how you reached to the battery compartment under the passenger footwell in the vehicle?
Is it as simple as removing 2 visible bolts in the passenger footwell? Thanks in advance.
PS: I don't own a Cayenne and looking for instructions how to gain access to the footwell to take a peek at the battery type myself, before any vehicle purchase.
At the moment, I am looking at the used car market in hope to find one with an AGM battery installed, I was hoping perhaps some 2020 Cayenne models may already have AGM instead of LiFePO4 batteries. (Anyone know?)
Reading all of these horror story posts about lithium batteries got me to wondering about the AGM battery in my 2022 base Cayenne. Is it essentially off-the-shelf and otherwise ordinary? Or, does a Cayenne AGM battery also have specialized internal circuitry like the lithium battery that will be costly to replace? Anyone know?
Last edited by mxp0; 08-21-2023 at 01:46 PM. Reason: minor
#328
Rennlist Member
Hello mxp0.
Easy to check the battery type. First, remove the floor mat on the passenger side. Then lift and slide the battery cover as shown below:
Voila! Lithium looks like this:
AGM battery looks like this — picture of battery in a 2024 Base:
Bonus: See attached for a 2021 Cayenne owner’s manual.
Easy to check the battery type. First, remove the floor mat on the passenger side. Then lift and slide the battery cover as shown below:
Voila! Lithium looks like this:
AGM battery looks like this — picture of battery in a 2024 Base:
Bonus: See attached for a 2021 Cayenne owner’s manual.