Car wouldn’t charge at home after sitting idle for 2 weeks

[mod72346]

Any perspective on this would be helpful...

Taycan 4S 2021 sat idle for 2 weeks at 51% SOC, then I plugged it overnight, and in the morning it was at only 54% instead of 85%. Everything looked normal/green, but the power was 0.0 kW instead of full 8.5 kW. I re-plugged, and it ramped up to 6-8 kW for a few minutes, then dropped to 0 kW. I tried J+ Booster2 (instead of the updated Porsche charger) and the same scenario repeated. Several more attempts, same result - the car wouldn’t charge.

So, I took it to EA 350 kW charger, and I got it to charge:
SOC 50% => 128 kW
SOC 70% => 105 kW
SOC 80% => 95 kW
SOC 90% => 86 kW

These numbers look too low, but at least, I got it to charge.

Then I tried charging at home, and it's been charging just fine several nights in a row.

What could this be? Any recommendation?

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[PanameraFrank]

Just guessing your 12v was low on juice, generally recommended not to leave the Taycan that long without starting it up or charging it, and it was having trouble getting a slow charge going. Or the charger was just acting up.

Those EA numbers are fine, sometimes even those 350 chargers give you really slow speeds. I've had them peak sub 100kw before.

I don't see any big reason for concern here. I think it's just a consequence of the 2 weeks idle.

 

[McgR]

Or you still have an active destination in PCM and PCM / app will show charge planner active. In this scenario you will also be missing the direct charge button in the center screen. Some stupid software bug where it stops charging if soc is sufficient to arrive at the set destination.

to solve it : stop navigation to desition. Or entre a new one and stop it again.

I hope it is this. Would be easier to solve.

125 kw at 50% without preconditioning doesn’t sound too bad ?

 

[DerekS]

Did you use Porsche's charger? Has it been fixed via the recall yet?

It sounds to me like it got hot and shut down.

 

[mod72346]

Yes, updated. J+ Booster2 behaved exactly the same, so it's not because of ESVE

 

[feye]

Same here 2 months ago. After the car sit idle for 2 months, AC charging was not working anymore, got a red light on the car and charging error indication inside.

DC fast charging worked as usual. So in the car a module was broken. Had to be replaced.

 

[Tooney]

Yes, updated. J+ Booster2 behaved exactly the same, so it's not because of ESVE

Unless using the PMC+ first caused something to go wrong in the car.

 

[W1NGE]

Just guessing your 12v was low on juice, generally recommended not to leave the Taycan that long without starting it up or charging it, and it was having trouble getting a slow charge going. Or the charger was just acting up.

Those EA numbers are fine, sometimes even those 350 chargers give you really slow speeds. I've had them peak sub 100kw before.

I don't see any big reason for concern here. I think it's just a consequence of the 2 weeks idle.

Don't think 2 weeks is a long time / explanation - 6 months then maybe.

Suspect PCM / NAV related if everything else (that is obvious) has been checked - EVSE equipment, timers, profiles etc.

 

[gtm]

Any perspective on this would be helpful...

Taycan 4S 2021 sat idle for 2 weeks at 51% SOC, then I plugged it overnight, and in the morning it was at only 54% instead of 85%. Everything looked normal/green, but the power was 0.0 kW instead of full 8.5 kW. I re-plugged, and it ramped up to 6-8 kW for a few minutes, then dropped to 0 kW. I tried J+ Booster2 (instead of the updated Porsche charger) and the same scenario repeated. Several more attempts, same result - the car wouldn’t charge.

So, I took it to EA 350 kW charger, and I got it to charge:
SOC 50% => 128 kW
SOC 70% => 105 kW
SOC 80% => 95 kW
SOC 90% => 86 kW

These numbers look too low, but at least, I got it to charge.

Then I tried charging at home, and it's been charging just fine several nights in a row.

What could this be? Any recommendation?

Two weeks unplugged shouldn't be a problem. I've left the car unplugged for up to 4 weeks with almost no loss in SoC. Are the charging buttons on the car red? If so perhaps the thread below is applicable.
https://www.taycanforum.com/forum/threads/tsb-ac-charging-not-possible-may-3-2024.20036/#post-316641

 

[mod72346]

Some clarifications:
- route planning was *not* active,
- direct charging button was available and "pressed",
- all indicators were "green" like during active charging, but the power was zero (0.0 kW in the car, and 0.8 kW in the app)
- SOC stayed at 51% for the 2 weeks, as I left it,
- after successful DC charging, I returned home, and AC charging returned to normal (8.5 kW) and it's been stable for a week with PMC+
- I drove ~10 miles (roundtrip) to/from DC charger, so maybe that helped replenish the 12V battery? I'm just guessing.
- Battery temp was 40C when I got to EA.
- Forgot to mention: during those 2 weeks, my Connect services contract expired, and I had to renew it.

I'm thinking, it was a temporary glitch. Maybe the 12V battery caused it, or PCM software (due to contract renewal). But I'm still a bit concerned that it happened.

 

[Gino]

Just guessing your 12v was low on juice, generally recommended not to leave the Taycan that long without starting it up or charging it, and it was having trouble getting a slow charge going. Or the charger was just acting up.

Those EA numbers are fine, sometimes even those 350 chargers give you really slow speeds. I've had them peak sub 100kw before.

I don't see any big reason for concern here. I think it's just a consequence of the 2 weeks idle.

I routinely leave my Taycan for 2-4 weeks idle in my detached garage which only has 120V charging. I was told to leave the vehicle charged to at least 50% and the main battery will keep the 12V battery charged.
So far that appears to work but I was hoping to add a OBDII adapter plug to attach a trickle charger to insure the 12V battery is always at the top of its game. Worst case it would allow me to leave the pigtail out the window or below the door so if the battery does die I can attach a charger to get back in the car, open the frunk & replace the 12V battery but I’m also learning it is not a simple task to replace the 12V battery on my own.
Since I travel extensively and don’t drive my vehicles much, adding a trickle charger makes sense to insure all my 12V ICE & EV batteries are properly maintained.

 

[W1NGE]

Some clarifications:
- route planning was *not* active,
- direct charging button was available and "pressed",
- all indicators were "green" like during active charging, but the power was zero (0.0 kW in the car, and 0.8 kW in the app)
- SOC stayed at 51% for the 2 weeks, as I left it,
- after successful DC charging, I returned home, and AC charging returned to normal (8.5 kW) and it's been stable for a week with PMC+
- I drove ~10 miles (roundtrip) to/from DC charger, so maybe that helped replenish the 12V battery? I'm just guessing.
- Battery temp was 40C when I got to EA.
- Forgot to mention: during those 2 weeks, my Connect services contract expired, and I had to renew it.

I'm thinking, it was a temporary glitch. Maybe the 12V battery caused it, or PCM software (due to contract renewal). But I'm still a bit concerned that it happened.

Did that include the charging service? Possible the plug and charge + the charging service were suspended which together precluded AC home charging.

Doubt very much that there was a 12v issue many systems such as unlocking the car would have been impaired too.

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