"Taycan lets you drive with shorted out battery modules"

[Tooney]

Taycan lets you drive with shorted out battery modules, WTF
For reference, this battery I’m posting below belongs to a car that came driving to my shop with a yellow warning ONLY. The owner was driving it daily and DC charging it.

This car came DRIVING to my shop. All 33 modules were below 1MΩ isolation. Undoubtedly this means there is live voltage on the battery frame while you are driving this car.

Come on Porsche… the BMS has a specific circuit to assess almost in real time the electrical isolation of the battery pack and yet it’s the DCDC that needs to step in and request emergency de-energizing of HV system ?? (and keep in mind this always happens way later than it should)!!!

Sponsored

 

[cometguy]

what model year Taycan, and how many miles on the odometer?

 

[snstevens]

There is something inconsistent about the Rennlist posting behind this information.

I read through it and the Rennlist OP says that all the cars he services are Grey import cars - "All these cars are bought brand new from Porsche in the UK. Almost all of of them from Porsche Centre East London." So there is an assumption that the cars arriving in Thailand are "new".

But he goes on to write about the cause of the battery failures - "It’s water from outside, the battery lids are glued forming an IP67 water tight seal. The moment this seal leaks, even if a tiny tiny tiny leak, water will find its way in cuz it gets vaporized when you drive over it at speed… Obviously the batteries that suffer most from this are the already repaired ones, but I’ve seen tens of them with factory seal, never touched before, also failed. Of course if the battery has a major impact, it may very likely cause leakage of coolant to the inside of the battery… But that’s a whole other matter as it would be caused by “improper use”."

Toward the end of his thread he claims a car arrived the same day as his posting with a YELLOW battery fault light on, and goes on to say they opened the battery to find battery modules in pools of water.

I have no clue from this series of posts if what he claims is happening is really happening. The OP of the Rennlist thread apparently wants to slam the Porsche BMS for allowing someone to drive the car with failed battery modules (if true then I agree), but then he talks about seeing so many of these cars. But I just don't get it.

If this were a common issue we'd have to be seeing battery modules floating in water all over the world where Taycans' are sold.

[My use of Italics and Underline above to highlight the number he claims to have seen]

 

[Tooney]

His original post was dated August 28, 2024.
The Taycan ARB6/ARB7 recalls in US which will install HV battery diagnostic software are dated October 1, 2024.
I wonder if ARB6/ARB7 recalls are potentially in response to problems like those he reported.

 

[snstevens]

His original post was dated August 28, 2024.
The Taycan ARB6/ARB7 recalls in US which will install HV battery diagnostic software are dated October 1, 2024.
I wonder if ARB6/ARB7 recalls are potentially in response to problems like those he reported.

If true then for some reason Thailand is the hot spot for these problems. There just aren't stories like this coming from other countries...

 

[Tooney]

If true then for some reason Thailand is the hot spot for these problems. There just aren't stories like this coming from other countries...

He is an independent repair shop.
If such problems were being observed by authorized Porsche dealers, do you think they would be sharing the details with the public?
They are replacing Taycan (and Audi) batteries and modules in other countries - do we know the internal battery conditions the Porsche dealer service shops are seeing?

 

[snstevens]

Sorry, but it doesn’t seem credible to me. If all Porsche dealers were seeing “tens of them” [Taycans] with water in their batteries, we’d know about it.

 

[rim23]

Sorry, but it doesn’t seem credible to me. If all Porsche dealers were seeing “tens of them” [Taycans] with water in their batteries, we’d know about it.

I wouldn’t believe much the official dealers as they tend to hide information. And given their ability to add additional 0s to bills, I wouldn’t say they’re the only reliable source.

Typically, you get more information on reliability of cars when they start to loose warranty and go to independent shops.

 

[JimBob]

Something doesn't add up. The law requires manufacturers' to report defects to the government and owners. Including details of the defect and what precautions that need to be taken and correct the defect. I doubt there is a massive coverup to hide this. Car manufacturers know what happens to them when they lie to government agencies. Plus the contingency lawyers live for this kind of stuff.

 

[Caraholic]

I a 100% believe his post. My 2020 two years ago went in with the yellow battery error. Was driving on it for a couple months waiting to get in. Long story short the vehicles frame was fully charged and my dealer could not touch it. It had to be flat beaded to a different dealer and the master tech came in to fix it. Five month ordeal and 12 modules later all has been well. Granted I still have little faith in the remaining modules.

 

[Pope]

That frame looks to have been previously repaired: the adhesive bead is rough as a badgers and the amount of corrosion within the bead line suggests a poor prep and repair process. If it's a repaired battery; was it pressure tested before going back in? Too many variables out of the control of the manufacturer after that and if the repair isn't up to scratch then it will inevitably fail - like the photo - anyone COULD repair the battery; doesn't mean they SHOULD.....

 

[Vim Schrotnock]

I can’t speak to the validity of an individual post, but there is plenty of corroborating evidence out there that points to the ‘bead seal’ as one of the major causes of battery failure. I watched them put the seal on my battery, and it was an incredibly complex procedure that required extensive training, equipment and skill - a bad combination for a critical process.

https://www.taycanforum.com/forum/t...2023-taycans-apb2-4-777-units-affected.17150/

 

[Tooney]

The portion of his posts in the original thread that concerns me is his assertion that Taycans are not warning drivers of shorted out, faulty HV battery conditions, some of which he believes are dangerous safety conditions.

 

[chun]

Something doesn't add up. The law requires manufacturers' to report defects to the government and owners. Including details of the defect and what precautions that need to be taken and correct the defect. I doubt there is a massive coverup to hide this. Car manufacturers know what happens to them when they lie to government agencies. Plus the contingency lawyers live for this kind of stuff.

The law also required VW to declare emisions of the cars they produce to the governments... we know how that ended, don't we? Who owns Porsche? Did the leadership that take that decision change?

Yea... we should definitely trust them guys, they never lied before /s

 

[iamai]

Taycan lets you drive with shorted out battery modules, WTF
For reference, this battery I’m posting below belongs to a car that came driving to my shop with a yellow warning ONLY. The owner was driving it daily and DC charging it.

This car came DRIVING to my shop. All 33 modules were below 1MΩ isolation. Undoubtedly this means there is live voltage on the battery frame while you are driving this car.

Come on Porsche… the BMS has a specific circuit to assess almost in real time the electrical isolation of the battery pack and yet it’s the DCDC that needs to step in and request emergency de-energizing of HV system ?? (and keep in mind this always happens way later than it should)!!!

curious. why this sub-bar picture quality showing everything is not in-focus but at the same time claiming that a specific reading of 1MΩ is present and NOT showing a picture of that!?

Sponsored