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Discussion Starter · #1 ·
My ID4 has just displayed an error warning for the 12-volt battery for the second time in one month.
It was previously "repaired" at the dealership a month ago and I believe they said it was a computer error but now it's happened again.

Anyone else having this problem?
What are you doing about it?
So frustrating!!!
 

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Enthusiastic 1st Edition Owner
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I'm going to guess it's failing and needs to be replaced.

Just curious – are you in a cold climate? And do you sometimes park for days at a time? Do you precondition your cabin frequently?

I'm just trying to see if there's a pattern to who's 12 volt fails early.
 

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Discussion Starter · #5 ·
I'm going to guess it's failing and needs to be replaced.

Just curious – are you in a cold climate? And do you sometimes park for days at a time? Do you precondition your cabin frequently?

I'm just trying to see if there's a pattern to who's 12 volt fails early.
I'm not in a cold climate but do park if for days at a time and I don't precondition the cabin. I didn't even know you could do that! :)
 

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My suspicion had been that letting the ID sit for days at a time between drives allows the 12 volt battery to run down to unhealthy levels before it's recharged by the high voltage system. The alternative – driving it daily – would maintain the 12 volt at a fairly high level, keeping it in the safe zone .

I figured cold temps exacerbates the problem. But I'm just across the bay from you, not unreasonably cold. Mine gets driven daily, however.

What I don't know is whether the 12 volt has any responsibility for high load heating, such as seat heaters or the steering wheel heat. I don't imagine it does under normal preconditioning, when the cabin heater or AC kicks in running off of the high voltage system.

VW has a new, more suitable battery for us that we should be called in for soon. Is suggest taking yours in and having it tested and replaced.
 

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Discussion Starter · #10 ·
My suspicion had been that letting the ID sit for days at a time between drives allows the 12 volt battery to run down to unhealthy levels before it's recharged by the high voltage system. The alternative – driving it daily – would maintain the 12 volt at a fairly high level, keeping it in the safe zone .

I figured cold temps exacerbates the problem. But I'm just across the bay from you, not unreasonably cold. Mine gets driven daily, however.

What I don't know is whether the 12 volt has any responsibility for high load heating, such as seat heaters or the steering wheel heat. I don't imagine it does under normal preconditioning, when the cabin heater or AC kicks in running off of the high voltage system.

VW has a new, more suitable battery for us that we should be called in for soon. Is suggest taking yours in and having it tested and replaced.
Taking it in next monday. Should I ask for the new battery?
 

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2021 AWD Pro S on 2.1
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VW has announced it is doing a recall of all the 12v batteries in EU, and they get a new 'technologically updated" battery. No word on what they are doing in the US about it, see:
 

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I had the 12V battery warning and when I brought it to my dealer service center, they said they needed to replace a computer module. It's been three weeks now and last I heard they are still working with VW tech support to update the software.
 
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