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I've just spent a day with VW, who are currently unable to find a fix for the error message "12 Volt battery - Workshop!", which appears when I start the car - and then disappears. Everything seems to work. Has anyone had this?
 

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I have had this type of message a few weeks ago but don't know the cause. I think it was a little different maybe "12 Volt battery - Error". Turned the ignition off and on fixed it then and haven't seen it since.

Had any more info on it?
 

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Discussion Starter #4
VW have tested the battery & charging system and both are OK. Their final diagnosis is that an electrical control unit needs replacing, at £3000 plus £1000 labour. Needless to say, I'm going to live with the error message, at least for the time being. The idea that you have to shell out £4000 to correct a minor instrumentation fault is absurd. Anyone got any suggestions?
 

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VW have tested the battery & charging system and both are OK. Their final diagnosis is that an electrical control unit needs replacing, at £3000 plus £1000 labour. Needless to say, I'm going to live with the error message, at least for the time being. The idea that you have to shell out £4000 to correct a minor instrumentation fault is absurd. Anyone got any suggestions?
That price almost scraps the car, how can the part cost £3000 ! if you did face that I would think the best place to look for a secondhand one from a breakers would be German eBay or a German specialist. I assume it will be the same part for left and righthand drive but I may be wrong. So few have been sold here that I would doubt and breakers yard would have any parts.
I mostly enjoy being an early adopter but it can have downsides.
 

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VW have tested the battery & charging system and both are OK. Their final diagnosis is that an electrical control unit needs replacing, at £3000 plus £1000 labour. Needless to say, I'm going to live with the error message, at least for the time being. The idea that you have to shell out £4000 to correct a minor instrumentation fault is absurd. Anyone got any suggestions?
Welp! I hope it stays away from mine. That indeed sounds insane for a single part, I though cars where more module now. I was thinking more on the lines of a sensor problem. Did they say it was the whole ECU or a part of it?

Whats the digital equiverlant of painting the cheak engine light :)
 

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Hi, I've only just joined the forum as my recently purchased E-UP (2014 16Kmiles) started to present exactly this fault, so I'm certainly concerned by the potential costs. Also the poor diagnostics/support apparently offered by the OPs dealer, looks worrying. Mine is in for a check with my local VW dealer next week, so I'll be able to add more then.

In the mean time I just have an observation. I popped a DVM across the 12V battery to just try an understand the charging sequence and observe the voltages, during the start sequence. With the vehicle connected to its charging supply, the 12V battery is sitting nicely at 14.9V being topped up at the same time as the main batteries. With the charger disconnected this drops to around 12.3V. During the start sequence the 12.3V battery drops to ~11.3V as the drive system initiates and then climbs back to around 14.5V as the DC/DC converter kicks in. Just by way of supporting the 12v battery during the start sequence I hooked up a booster battery; the battery warning didn't occur on startup. While the figures for the car's 12V battery don't appear bad, I'm rather hoping that its a combination of an overly sensitive detection circuit and a 5 year old Lead battery.
 

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Great detective work. Sound plausible.

I believe the 8 year warranty covers the high voltage battery and drivetrain but I’m not sure I have ever seen a list of what exactly is covered. I’m sure the 12v battery will not be but this expensive electronic control unit perhaps should be?
 

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Try asking the dealer to flip the 12 volt battery and see if it clears the error message.
Worth a try at the very least !.
I know they said it has been checked already, but we have all heard that old chestnut before !.
These people talk about £4,000 like its loose change in your pocket !.
 

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I had to reschedule my dealer appointment till the 28th May, so I'll update then. I've been quoted £42/half-hour diagnostics check to determine the cause of the fault, swapping out the battery sounds like a a cheaper approach, but I suspect its not as easy as I would hope.
 

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You may find this interesting reading

He's dead Jim!!!
Thanks, the OP was a bit quick jumping straight to scrap! I've had a quick search to see if i could find the spec for the E-UP 12V battery, no luck so far, certainly worth a bit more time though.

Update, the Yuasa site identifies this battery as compatibleYBX3202 YBX3202 just did a quick set of measurements and it appears the same. Just spotted it on Amazon for £48.99 seems like a worthwhile expense to test the theory, and only slightly more than 30 mins on VW diagnostics.
 

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Thanks, the OP was a bit quick jumping straight to scrap! I've had a quick search to see if i could find the spec for the E-UP 12V battery, no luck so far, certainly worth a bit more time though.

Update, the Yuasa site identifies this battery as compatibleYBX3202 YBX3202 just did a quick set of measurements and it appears the same. Just spotted it on Amazon for £48.99 seems like a worthwhile expense to test the theory, and only slightly more than 30 mins on VW diagnostics.
Is it not possible to get the correct battery at a similar rate more locally ?.
I was just thinking you could then have the new battery fitted and with an agreed promise of a refund if it does not clear the error code.
Returning a heavy car battery via Amazon could be an expensive process ????.
Worth looking into at least I guess !.
 

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If you are near a TPS they are often cheaper TPS - for Genuine Volkswagen Group Parts

It's a VW owned chain and focused on the trade but I find you can go in as a regular "punter" and simply pay with a card.

They did a battery for my VW fossil cheaper than anyone else I could find locally.
 

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I suspect a new 12v battery will fix it, VW dealers (along with many other marques) seem incapable of diagnosing many things these days.

VW tried to sell me a £400+ AGM battery as a replacement for the £50 Lead Acid version fitted at the factory that had given up the ghost in my GTE.

Since fitting a like for like Lead Acid replacement I’ve had zero error messages.
 

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Thanks for the suggestions/advice. I've now tried a replacement battery, and unfortunately the fault is still being reported. I'm wondering (more hoping) whether the fault will have been logged and then latched, and that it needs to be cleared in some way. The car is in next week with the garage so I should have an answer.
 

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Just back from the garage and long story short the error has been cleared, which is good. The technician blamed the presence of a non-genuine battery as the cause, which is nonsensical as the approved Yuasa battery was only fitted because of the appearance of the fault. However a mysterious process called "battery adaption" was referred to and the car now accepts the replacement. Personally I suspect its probably some sort of simple reinitialisation of the fault detection system and/or a battery health monitor circuit. They clearly want to fit genuine parts at rather inflated prices, which is no surprise. That said they did ok as it was the first E-UP they'd ever had to work on.
 

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Just back from the garage and long story short the error has been cleared, which is good. The technician blamed the presence of a non-genuine battery as the cause, which is nonsensical as the approved Yuasa battery was only fitted because of the appearance of the fault. However a mysterious process called "battery adaption" was referred to and the car now accepts the replacement. Personally I suspect its probably some sort of simple reinitialisation of the fault detection system and/or a battery health monitor circuit. They clearly want to fit genuine parts at rather inflated prices, which is no surprise. That said they did ok as it was the first E-UP they'd ever had to work on.
Another example of main dealers wanting total control of your car when it requires any parts & labour.
If they had fitted the new VW supplied battery, they would have then cleared the fault code as a matter of protocol.
Same result on your car, but they are “Sulking” just because you fitted an alternatively supplied battery then needed them to clear the code !.
Alternative battery does the same job, but half the price of the dealer supplied unit.
 

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Discussion Starter #19
Well! At least I'm not on my own with this fault. Many thanks for all your replies. I've chosen to ignore the message (It disappears after a few seconds), and 2 months and 1500 miles later, all seems to be well. The VW technician told me that he'd tried swapping out the 12 battery without success. I think my next move will be to try & find another garage (non VW) able to work on the car. I live in Devon. Anyone got any suggestions? Incidentally, I did a 200 mile round trip yesterday, with 3 charges using Instavolt units. All worked really well and very easy to use (Unlike Ecotricity) & average charging time no more than 15 minutes. This was a first for me, and am now quite relaxed about doing a long journey again.
 

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Well! At least I'm not on my own with this fault. Many thanks for all your replies. I've chosen to ignore the message (It disappears after a few seconds), and 2 months and 1500 miles later, all seems to be well. The VW technician told me that he'd tried swapping out the 12 battery without success. I think my next move will be to try & find another garage (non VW) able to work on the car. I live in Devon. Anyone got any suggestions? Incidentally, I did a 200 mile round trip yesterday, with 3 charges using Instavolt units. All worked really well and very easy to use (Unlike Ecotricity) & average charging time no more than 15 minutes. This was a first for me, and am now quite relaxed about doing a long journey again.
Thanks for the OP it helped me find this forum in first place, it’s really very useful. The warning message disappeared for me as well after a few seconds, but it kept on appearing each time I started, so there was always that niggle that I might get caught out. The link that Trapdoor posted was an eye opener. What I hadn’t realised is just how few E-UP!’s are on the roads in the UK, current figure is just 207 VOLKSWAGEN E-UP - How Many Left?. It’s clear that many VW tech’s just have to work from the script when faced with a car they’ve never worked on. One suggestion might be to look for a specialist auto-electrician that can run a load test on your 12v battery and record how it actually performs, but it might cost as much as a new battery. That said, I’m assuming that only VW have access to the diagnostics routines that were used to tell the car it has a new battery fitted as in my case. Good to hear about Instavolt, they’ve installed a few charging points at our local North West supermarket Booths.
 
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