12v battery low please connect to charger

[wigwam]

This is all incredibly helpful
I haven't done a good 20min+ drive for a month

Will go on a motorway blat tonight

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[wigwam]

Something else occurred to me
Does a hardwired dashcam drain it even faster? I wonder if that is also causing an issue and I better get it disconnected?

It was put in by halfords and said it wasn't to the fusebox

 

[ShiftyWolf]

I'm also curious, as I know other members found documentation of the Audi GT and RS e-tron charging the 12V battery several times using the HV, but has anyone verified that our Taycans actually incorporate this same charging logic?

 

[ShiftyWolf]

Something else occurred to me
Does a hardwired dashcam drain it even faster? I wonder if that is also causing an issue and I better get it disconnected?

Mine is hardwired but also includes low voltage monitoring in park mode. I also have mine set to only record 12 hours after parking, to help limit drain on the 12V battery.

 

[wigwam]

Mine is hardwired but also includes low voltage monitoring in park mode. I also have mine set to only record 12 hours after parking, to help limit drain on the 12V battery.

Is there still a discussion of whether aftermarket dashcam can affect warranty?
1 engineer said "unplug it for now" other said "if its aftermarket hard wired it may affect warranty "(2 different dealers as I was trying to get it booked in earlier than 2 months time

 

[Hirschaj]

I'm also curious, as I know other members found documentation of the Audi GT and RS e-tron charging the 12V battery several times using the HV, but has anyone verified that our Taycans actually incorporate this same charging logic?

I’m 99% sure that one of our forum members verified using a measurement device and provided the charts as proof. I can’t recall who though.

 

[ShiftyWolf]

Is there still a discussion of whether aftermarket dashcam can affect warranty?

Not an issue in the US; don't know how it would be in UK

 

[sveinaan]

I’m 99% sure that one of our forum members verified using a measurement device and provided the charts as proof. I can’t recall who though.

https://www.taycanforum.com/forum/t...-the-saga-of-the-12v-battery.1274/post-205015

 

[Hirschaj]

https://www.taycanforum.com/forum/t...-the-saga-of-the-12v-battery.1274/post-205015

It was you! Thank you ?

 

[wigwam]

14.2 V is definitely an indication that your 12 V battery is being charged by the HV system. It should be indicating 13.4-13.5 V during normal driving. A 20-minute drive should suffice to get the battery charged. How long does your car set between drives? I’ve found the 12V battery starts losing power after a week or more of not driving…regardless of whether or not it’s plugged into a HV battery charger. I would also look into any external sources (dash cam) that my be draining the battery while the car is parked.

Thank you all and this post nicely summarised the issue
So last night I decided I'd do a motorway run which was 40min of driving
Just as well as the PCM warning was now "connect to charger soon"
It didn't actually drop from 14.4v all journey.
I unplugged the dashcam overnight
Plugged into HV charger overnight to find it hadn't charged and was generally sluggish

This morning went for a drive and saw the error/warning didn't come up, the 12v dropped from 14.4 quickly down to 13.4v and has stabilised there and the PCM is responsive again

So ir does seem like my sustained small local journeys and generally not driving it much took its toll but as someone mentioned the dynamo effect of the drive seems to have reset it for now
Have plugged back into HV charger and it's recognised being plugged in (last night the pcm remained dark)

Thank you all.
Will update anything else

 

[SteveDC]

Something else occurred to me
Does a hardwired dashcam drain it even faster? I wonder if that is also causing an issue and I better get it disconnected?

It was put in by halfords and said it wasn't to the fusebox

I will soon have a dash cam installed and I am asking that the installer include a switch that allows me to manually disconnect it. This dashcam has parking mode, which will drain your 12 V battery. My car generally sits about 10 days between uses, so I decided to add the switch.
There is a thread here somewhere that shows that the traction battery will recharge the 12V, but only 6 times, after that an error routine trips in and charging ceases. In other words, *while parked * the traction battery will charge the 12V, but only so many times. A long drive, as in an ICE car, is not needed. At least that’s my understanding.

 

[BigV]

Thank you all and this post nicely summarised the issue
So last night I decided I'd do a motorway run which was 40min of driving
Just as well as the PCM warning was now "connect to charger soon"
It didn't actually drop from 14.4v all journey.
I unplugged the dashcam overnight
Plugged into HV charger overnight to find it hadn't charged and was generally sluggish

This morning went for a drive and saw the error/warning didn't come up, the 12v dropped from 14.4 quickly down to 13.4v and has stabilised there and the PCM is responsive again

So ir does seem like my sustained small local journeys and generally not driving it much took its toll but as someone mentioned the dynamo effect of the drive seems to have reset it for now
Have plugged back into HV charger and it's recognised being plugged in (last night the pcm remained dark)

Thank you all.
Will update anything else

Good to hear…and I suppose there’s worse situations than needed to drive your Taycan more?

 

[iwanttogetaname]

Similar issue happened to me starting this weekend. I have no dash cam installed.
I suspect it might be the below 0 temperature recently in the garage this week?
Took car for a long drive, even to a high speed charger, still sees battery voltage at 14V or 13.9V, never drop. PCM constantly shutting down within a minute as well when parked.

 

[ThaJamez]

Similar issue happened to me starting this weekend. I have no dash cam installed.
I suspect it might be the below 0 temperature recently in the garage this week?
Took car for a long drive, even to a high speed charger, still sees battery voltage at 14V or 13.9V, never drop. PCM constantly shutting down within a minute as well when parked.

Mine is at the dealer now for the low 12V battery warning and immediately shutting down within 1 or 2 minutes when parked

 

[f1eng]

Mine died too after 9 days unused over Christmas, I had to do the manual procedure to get to the battery and jump start the car.
I has come up very occasionally when I get in the car with a warning that an accessory is drawing too much power, the only thing I had plugged in was a USB stick of music now removed.

Anyway I did a 470 mile round trip last week and thought that would give plenty of time to fully charge the 12V battery but the display showed 14 to 14.2 volts for the whole drive so if a fully charged battery shows around 13.4V mine wasn't charged even after 10 hours driving.

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