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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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Discussion Starter · #1 · (Edited)
I guess I wasn't able to dodge the gremlin gods forever. Sigh. Car lit-up like a Christmas tree and the 12V died soon thereafter. Thankfully this happened in my driveway but the worst part is I couldn't disengage the e-brake so had to dolly tow it 7 miles to the dealer. Tried disconnecting/reconnecting the 12V as well as providing external 12V to the battery posts. No dice. Just heard from the service tech that they can't even wake the car up. Seems like it's bricked. They have a call into the factory tech. Of course this car was running venerable 2.1 with the old 12V battery. Updates to follow...

 

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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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Discussion Starter · #2 ·
Note - if you can't engage neutral then you can't enable roll mode which you need to get onto a flat-bed tow truck. In this scenario you MUST dolly tow it with a wheel-lift tow truck:

 

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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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Discussion Starter · #4 ·
Sorry to hear. wouldn't it be worth popping on portable jump pack or battery tender to at least try to energize 12V system enough to wake up and put in neutral?
Tried that - didn't help. Even tried disconnecting the 12V entirely and reconnecting to reboot the computers. By the time the tech looked at it the next day the car was bricked and he couldn't even wake it up by connecting the 12V to an external source. Einstein is one sick puppy at the moment. If the car isn't even waking up with external 12V provided then a fuse is blown or ICAS is probably smoked or something...
 

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2022 Pro S AWD v3.1
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Has anyone found the part number for the new 12V battery and proactively replaced it without dealer help? Or is there something so special about that battery that only a dealer can do it? Will the replacement behave correctly with the v2.1 software?
 

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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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291 Posts
Discussion Starter · #7 ·
Has anyone found the part number for the new 12V battery and proactively replaced it without dealer help? Or is there something so special about that battery that only a dealer can do it? Will the replacement behave correctly with the v2.1 software?
I suggested to the dealer tech that maybe they could install the new 12V or at the very least swap it out for a fully-energized old 12V. Haven't heard anything yet. My suspicion, however, is that the car's charger needs an update to support the new 12V (or at the very least new config data so it knows what kind-of battery it's charging).
 

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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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291 Posts
Discussion Starter · #8 ·
The same thing happened to me, the car is been in service for over 6 weeks now, started the buyback process. I hope you are lucky and get a faster fix.
Oh man that sucks. Are you getting a 2023 Chattanooga build as a replacement or are you done altogether?
 

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12V battery new chemistry is EFB+ , if will need 12V battery adaptation and change in 12V battery coding side.
In my Golf, the adaptation is relatively simple - just use VCDS or OBDeleven to change the battery brand, model number, capacity and chemistry. Is it the same on MEB cars, or is it more complicated?

I know lots of folks who run AGM batteries on their Golfs, and I imagine if the coding is the same, we could do that on the ID.4 as well?
 

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In my Golf, the adaptation is relatively simple - just use VCDS or OBDeleven to change the battery brand, model number, capacity and chemistry. Is it the same on MEB cars, or is it more complicated?

I know lots of folks who run AGM batteries on their Golfs, and I imagine if the coding is the same, we could do that on the ID.4 as well?
Yes quite simple if you are familiar with obdeleven
Example
 

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2021 Pro AWD
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484 Posts
Tried that - didn't help. Even tried disconnecting the 12V entirely and reconnecting to reboot the computers. By the time the tech looked at it the next day the car was bricked and he couldn't even wake it up by connecting the 12V to an external source. Einstein is one sick puppy at the moment. If the car isn't even waking up with external 12V provided then a fuse is blown or ICAS is probably smoked or something...
Wow, keep us posted. They gave you a loaner?

You don't happen to know your 12V state of health / voltage in the weeks beforehand from CarScanner or OBDeleven do you?
 

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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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291 Posts
Discussion Starter · #18 ·
Pl
Wow, keep us posted. They gave you a loaner?

You don't happen to know your 12V state of health / voltage in the weeks beforehand from CarScanner or OBDeleven do you?
I don't have a loaner yet - they need to determine the scope of the problem (and likely repair time) at which point they'll probably put me into a rental if it will be a long wait. I'm 7 miles from the dealer and they arranged a Lyft ride home in the interim (I work from home and have another car so it's fine for the moment). The service agent was telling me VWoA cut way back on loaners - not sure why.

I wasn't able to get the SOH of the 12V but it appeared to me the car wasn't charging the battery - makes sense if the HV system was disengaged (also explains why I couldn't release the e-brake). I do know it was around 11.7 volts when I connected my battery charger to the designated posts. I trickle-charged it for about an hour which got the voltage up to about 12.5V but once I removed the charger it was quickly drained again.
 

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"Einstein" (in critical condition) - 2021 ID.4 AWD Pro S, Scale Silver
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Discussion Starter · #19 ·
Update:

Factory engineer asked dealer tech to replace battery but that had no effect (car still dead). Current action item is to pin-out some cable harnesses. In the meantime I'm waiting to hear from the dealer about getting a rental/loaner (they're apparently consulting dealer management).
 
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