High Voltage Battery Recall EXPANDED - ARB6 & ARB7

[Tooney]

Since Porsche has sold over 156,000 Taycans, what would you propose doing differently?

Maintain regional/national inventories of repair parts, especially HV battery modules, so that Taycan owners (the "less than 2% potentially affected") do not have their Taycans sitting on crowded dealer repair lots for 3 to 4 months for diagnosis and repair.)

Hire more people to help the HV battery guy in Germany provide faster repair solution approval and guidance than today's 1- to 2-week response time.

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[356B]

The ARB6/7 diagnostic software may be doing what it's supposed to, but it fails bigtime as an actual "remedy" for "High voltage battery may short circuit".

The owner above who got the yellow service necessary warning loses use of his Taycan for at least six weeks for actual repair, primarily due to waiting for delivery of "backordered" battery modules.

Taycan owners get to wait because Porsche is saving money by minimizing its repair part inventory costs. At least in this case the HV battery is not being removed and shipped to a repair contractor in Oklahoma which would take even longer.

Nothing about this is "reassuring."

(And getting a non-Taycan loaner doesn't make up for any of it.)

While it is aggravating to lose one's car to a major repair, It does happen. I look at the software update as an addition instrument for managing the drive train. The software is not meant to remedy bad cells, but to identify bad cells. Much like oil pressure gauges give an indication of a problem in ICE cars. They don't solve the problem, they help identify the problem. If nothing is ID'd, that is a good thing and could be considered reassuring.

Having said that, I can handle losing the car this time. If other battery modules are ID'd after this repaint is completed, I may not be as circumspect about losing the car to another battery repair at a later date.

...but I still like my Taycan

 

[356B]

Further to this discussion. The new battery modules came in today. Work starts tomorrow. Big surprise. So I could have it back in a week or so.

 

[F1Ruaraidh]

Since Porsche has sold over 156,000 Taycans, what would you propose doing differently?

Go and look at the Audi TT high speed stability recall.
That is what they should be doing.

 

[snstevens]

Go and look at the Audi TT high speed stability recall.
That is what they should be doing.

Checked into it and learned that 40,000 first gen Audi TT's were affected, and the fix cost ~$1,200-$1,400 per car for parts, labor, and logistics.

With 156,00 Taycans to deal with, and a cost to replace an HV battery ranging from $30,000 - $50,000 I think the problem with the HV battery is in a different league from the Audi TT. Module replacement is estimated to cost Porsche $16,000 - $20,000, so it makes sense to me that they do that on an "as needed" basis.

 

[lloydt]

I never received any OTA updates for my 2021 4S CT. I scheduled service at the local Porsche dealer when I received the official letter that a remedy was available. Earlier today, the dealer applied the ARB7 fix, checking the cell block modules and updating the BMC software. So far, there are no issues, although I only drove the 20+ miles home. The service agent said it would now be safe to charge to 100% if needed for a road trip.

 

[F1Ruaraidh]

Checked into it and learned that 40,000 first gen Audi TT's were affected, and the fix cost ~$1,200-$1,400 per car for parts, labor, and logistics.

With 156,00 Taycans to deal with, and a cost to replace an HV battery ranging from $30,000 - $50,000 I think the problem with the HV battery is in a different league from the Audi TT. Module replacement is estimated to cost Porsche $16,000 - $20,000, so it makes sense to me that they do that on an "as needed" basis.

Not really. Those numbers are wildly wrong. They retrofitted ESP to cars that weren't fitted with it as standard. If you think you can do that for 1400 per car than you're sadly mistaken.

A new temporary production line was set up and ALL affected cars were trucked across the country and run down the new line to replace wiring looms and ECUs on already built cars. This work was carried out by the company I worked for way back then.

If you think swapping a battery for a new production battery by dropping it out and putting a new one in is even close to the labour of changing wiring looms on a modern car, then you're mistaken!

Battery is certainly far more expensive than a loom and an ECU for sure, but the swap cost is minimal. Porsche have taken FAR too long to resolve these issues.

Do they have to swap all batteries? Probably not. Should they have done this a lot sooner? Definitely.

I expect this behaviour from Ford, not Porsche.

 

[snstevens]

Not really. Those numbers are wildly wrong. They retrofitted ESP to cars that weren't fitted with it as standard. If you think you can do that for 1400 per car than you're sadly mistaken.

A new temporary production line was set up and ALL affected cars were trucked across the country and run down the new line to replace wiring looms and ECUs on already built cars. This work was carried out by the company I worked for way back then.

If you think swapping a battery for a new production battery by dropping it out and putting a new one in is even close to the labour of changing wiring looms on a modern car, then you're mistaken!

Battery is certainly far more expensive than a loom and an ECU for sure, but the swap cost is minimal. Porsche have taken FAR too long to resolve these issues.

Do they have to swap all batteries? Probably not. Should they have done this a lot sooner? Definitely.

I expect this behaviour from Ford, not Porsche.

Interesting, but I didn't talk about the method, but rather the number of cars and the cost/car.

Based on your experience, what was the cost/car, and how many cars were affected? Perhaps the data I found online was wrong - not the first time of course...

 

[GTSS]

Sorry if this has already been discussed. Since the OTA software update over a month ago, my car is now cleared of ARB6. However, I’ve noticed something a bit odd a few times: after driving for a couple of minutes, the displayed battery percentage actually goes up.


For example, I charge to 50%, drive for about 3 minutes, and then the display shows 53%.


Has anyone else experienced this? What do you make of it?

 

[chun]

Sorry if this has already been discussed. Since the OTA software update over a month ago, my car is now cleared of ARB6. However, I’ve noticed something a bit odd a few times: after driving for a couple of minutes, the displayed battery percentage actually goes up.


For example, I charge to 50%, drive for about 3 minutes, and then the display shows 53%.


Has anyone else experienced this? What do you make of it?

In Switzerland this behavior is very common, lots of going downhill with regen charging the battery. Also common during city traffic with regen on.

 

[GTSS]

Yes, I agree with that. It happened to me on long downhill roads.

However, I live in flat terrain and drive on same roads, same driving conditions and never occurred before this update.

 

[Freeewilly]

Sorry if this has already been discussed. Since the OTA software update over a month ago, my car is now cleared of ARB6. However, I’ve noticed something a bit odd a few times: after driving for a couple of minutes, the displayed battery percentage actually goes up.

For example, I charge to 50%, drive for about 3 minutes, and then the display shows 53%.

Has anyone else experienced this? What do you make of it?

I never notice this on 2022 Taycan, even after receiving the OTA battery fix, but charge % increase often on the 2025 Taycan after overnight parking, not due to long downhill road.

 

[356B]

Further to this discussion. The new battery modules came in today. Work starts tomorrow. Big surprise. So I could have it back in a week or so.

2.5 weeks after taking my '22 CT4 in for two replacement cell modules, repairs are complete and I have the car back. Repairs were done in house by the dealer.

 

[Sace]

Yes, I agree with that. It happened to me on long downhill roads.

However, I live in flat terrain and drive on same roads, same driving conditions and never occurred before this update.

I have seen the same on my car from time to time. The SoC does seem to fluctuate a bit more since the update.

 

[Not2pc]

Random note: Got mine back today from service after update. No Macan EVs even on the lot. Was told they cleared them out due to EV incentives running out. So, I had a tank aka a Cayenne as the courtesy vehicle. I've never even seen a Macan EV on the road. So, that was sort of odd, but glad they are selling. Hoping, the 718 EV eventually comes to market.

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