Take it back and let them load test 12V battery....if run quite low on voltage before....it will be just question of time before it will need new 12V battery.

 

Why does it run low in the first place? Seems like a lemon of a battery to me...

 

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!

 

What was done with 12V system last time you were in service . Can you post service ticket ?

 

It doesn't make much sense to me but here is what the service ticket said:

 

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?

 

I would disagree....i have left ID4 couple times for 4+ weeks without having any issues with 12V battery. Despite my experience there could be something happening with his ID4.

 

I have left mine for over 3 months. No problems with my first start after that.

 

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:

VW Statement on facebook

official statement just made by VW on the facebook group: Dear ID. Drivers, In the past few weeks, we have received many similar questions on essential topics. In the following, we have summarized the most important information according to the current status and hope that it will answer most...

www.vwidtalk.com

 

That announcement goes back to November last year. I've not heard of or received any information about a replacement battery so far.

 

We will eventually all get upgraded 12v batteries.

 

They were on the Felicity Ace (kidding).

 

Not totally out of the realm of possibilities. I am assuming they wouldn't be locally sourced when they are.

 

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.

 

That is not good to hear! They mentioned the gateway module 2 days ago and my car is still in the shop as they don't know what to do... 3 weeks would be my tipping point. What are you going to do?

 

If anyone is interested, after 3 weeks at the dealership with the techs trying to figure out the problem, I finally have my car back! Thank you all for your comments.
Here's the description of what was done:

 

Keep eye on coolant level for a week.

 

@elizaio thank you.

 

My last visit to Australia was also using bonnet most of the time.

 

Yes, and they drive on the British side of the road as well. 😉

But then down under everything is reversed.

 

On my way to work today I received an error message stating that the 12V electrical system in my 2021 ID4 had failed. This happened on a parkway at 55mph. The accelerator immediately stopped responding and the car slowed to a stop on the highway in heavy traffic. Once stopped, it took several seconds to restart the car and regain use of the accelerator. At this point the message changed to "Electrical system not working correctly. Please service vehicle."

I called my dealer right away once I exited the highway. The service person knew of the issue. He said this was a common problem that VW is aware of. The solution he said is to replace the 12V battery. I asked when that could be done. He let me know that his dealership had no ID4 battery in stock. He then called VW of America and asked them if they could substitute a similar battery that they did have in stock. The answer was no. He also let me know they have had an order in to VW of Ameria for these batteries for some time and weren't receiving them. At this point he used his inventory computer to search for a replacement from dealers in the Meto NY city area. That is at least 20 dealers. None were found.

VW sent me an email over a month ago saying the long promised software update would be coming in the new year and along with it a new 12V battery. I had planned to use this vehicle to visit family over the holidays, a trip of 1500 miles round trip. That is not possible now. In the mean time I have a very expensive sculpture sitting in my driveway.

I have been unhappy with the software in the car since almost new. It is now a year old and not functioning. I've lived with the stupid things like blank system screens, dome lights not coming on when the door is opened and buttons not responding.

I think VW rushed these cars to market. If I had to do it over I would buy a Tesla.

 

...replace the 12V battery. his dealership had no ID4 battery in stock. He then called VW of America and asked them if they could substitute a similar battery. The answer was no.

At this point he used his inventory computer to search for a replacement from dealers in the Meto NY city area. None were found.

I can't think of an attribute of a 12 volt sealer lead acid battery that wouldn't let it be swapped in, as long as it can be secured to the tray. Maybe it won't last forever, but anything will do in pinch.

However if I was VW, I'd say no, too. VW can't just go recommending non -specd parts willy-nilly.

 

The problem isn't so much changing the battery. From what I was told by the service manager the computer needs a complete reload once power is lost. I don't know why this requires several hours.

 

I don't know this to be the case with the ID.4 but nevertheless, I had an Audi that I didn't want to mess with the computer resetting, so I connected a battery tender to the jump points while I swapped out batteriy, keeping the computer alive the whole time.

 

So based on this chart, the voltage pretty much matches the amount needed given the battery temperature.
but imho should be around the float voltage given the high SoC of the 12v battery.

 

This is to prevent sulfate part of 12v battery maintenance that happens depending on SOC and temperature. And at this stage DC-DC converter only trickle charge battery and all other energy needed is supplied from converter while vehicle is running.
You can manually test under load SOH when you read with scanner 100 SOC.
Can you tell me what is your resting voltage, there is pid for this i have provided?

 

BTW: SOC dropping from 100% to 90% in 5 hours of parking is also massive imho.

 

What draws you see when you live vehicle and for how long they happen..
.i know that you are on old software. If impossible with dongle....you can use current clamp meter to keep eye on this.
Can you post resting 12V battery voltage pid? It is available in carscanner app for ID4....i have sent this pid 50 days ago to carscanner app developer.

 

One item I missed on my above post, for AGM never do equalizing voltage since it can permanently damage them. Here is some data I posted in my Experiment watching my 12v battery voltage, and its getting too low every night I have lots of other data recorded and can post more later. SOC is always near 100%, and goes there quickly since its become a very weak battery in only 9 months. Mine often goes to 15.5v like on this graph, and stays there all day when its cold and battery is around 10F and this is much too high for a float voltage. My expert sources say at 10F the float voltage should be 14.6v max. after applying temp. compensation to the 77F float of 13.5v.

 

One item I missed on my above post, for AGM never do equalizing voltage since it can permanently damage them. Here is some data I posted in my Experiment watching my 12v battery voltage, and its getting too low every night I have lots of other data recorded and can post more later. SOC is always near 100%, and goes there quickly since its become a very weak battery in only 9 months. Mine often goes to 15.5v like on this graph, and stays there all day when its cold and battery is around 10F and this is much too high for a float voltage.

Can you post resting 12V battery voltage pid
It is available in car scanner app?

 

Resting 12V battery voltage pid will set value when 12V battery maintenance is required.

 

Onboard DC-DC converter module receives information on 12V battery information and 12V demand for energy required...and from this information it will calculate best scenario to maintain energy requirements and boost output if 12V battery needs charging or trickle charge for 12V battery.

 

Here is another typical recent day when the car was holding the 12v too high at 15.45v every time I checked for hours, even though it was always 94-96% SOC. Battery temp was 25F. Edit: note this was also near the time when I am getting a "12v battery low, continue driving" error message, immediately after driving for 45 minutes which should have been charging the entire time (did not have the dongle on, it was my wife driving.)

 

I think you should log enough data and bring this to the service department attention....and have them run ODIS tool for logging rhis parameters regarding 12V battery charging....and after they finish tell them to call engineering department and provide logging on this pids....you may have to live vehicle for a day or two..... this is interesting discovery and it will need some corrections from my side of engineering department.
I'm quite positive that you know EFB+ chemistry and best way how onboard DC-DC converter should be maintaining.... I will do what is needed from my side to make aware of this issue VW engineering.
Thank you for taking your time and pointing me to this bug on our side.....
Quick question are you on EFB+ chemistry? And are you on latest software version?

 

can this 12V battery issues be solved by using something like this as soon as you get the error?

 

can this 12V battery issues be solved by using something like this as soon as you get the error?

No, since the 12v is going bad, it won't solve it. I carry a booster like that since the 2021 recalled style 12v are proven to leave people stranded once they start getting weak and they can fail at any time. Boost it and I can at least get to a dealer to drop it for replacement, without having to call roadside assist for a tow.

 

On Tuesday I got the 12V error bring in for service. I have a 4 week old 2023 Pro S. I tried to bring it in on Wednesday, but the car died as I was backing out of my driveway, so I had to have it towed to the dealer. I spoke to the dealer several times before bringing it in, but they didn't tell me they had a 4 day wait to even look at the car until it arrived, and they won't give me a loaner. Other than insisting they replace the 12V battery, is there anything else I need to have them do?
Really annoyed.

 

On Tuesday I got the 12V error bring in for service. I have a 4 week old 2023 Pro S. I tried to bring it in on Wednesday, but the car died as I was backing out of my driveway, so I had to have it towed to the dealer. I spoke to the dealer several times before bringing it in, but they didn't tell me they had a 4 day wait to even look at the car until it arrived, and they won't give me a loaner. Other than insisting they replace the 12V battery, is there anything else I need to have them do?
Really annoyed.

Call customer service...and ask them to provide you with rental, open with customer service department case so this can be escalated and VW service departments can get in touch with your dealership.

 

Why are new 2023 12v batteries seemingly dying so much? Are the batteries in newly assembled cars the new type or the old type?

 

New type....there are many things that can cause 12V battery to fail.

 

The message I got was "Error: 12 power supply. Please service vehicle." Message went away while I was at a electrify canada charger. Never got any 12V errors in the past year with the car. Only once it was carnet saying couldn'T start because of 12V yet the car had not eeors or messages. that occured first week I had the car.

 

The message I got was "Error: 12 power supply. Please service vehicle."

Its also strange that yours went directly to the more serious message about service, instead of the lesser error I have gotten about "12v battery low, keep driving to recharge". Did it go away quickly?