UMC Charges at 8 amp even though the tail is rated 10 amp

[BeachBI]

Hi

I took delivery of a Performance Model Y a few weeks ago.

It came with a UMC and the 10amp tail part number is 1463091-10-C, AU Adaptor 10 10A 250v

When I charge the car it only charges at 8amp

What are the exact steps to have the UMC firmware updated so I can charge at 10amp?

I have tried plugging the UMC in, the car is set not to charge, the car is locked, the UMC green lights are on, the car makes clunking noises, however the UMC does not update?

Any suggestions are appreciated

Thanks

 

[E90alex]

It’s operating as it should. A 10 amp adapter is limited to 8 amp charging to maintain 80% of circuit limit for safety.

 

[Anubis]

It’s operating as it should. A 10 amp adapter is limited to 8 amp charging to maintain 80% of circuit limit for safety.

Australia have better electrical systems than the USA. We can run at 100% of the circuit.

 

[Anubis]

Hi

I took delivery of a Performance Model Y a few weeks ago.
It came with a UMC and the 10amp tail part number is 1463091-10-C, AU Adaptor 10 10A 250v
When I charge the car it only charges at 8amp
What are the exact steps to have the UMC firmware updated so I can charge at 10amp?

As I understand it, you just need to plug the UMC in to the powerpoint and the car. Then make sure the charge limit is BELOW the current charge (so it doesn't actually charge). Leave it for a few hours to do the firmware update on the UMC/Tail. I'm doing this now. I'll report back later if this doesn't work for me.

btw, this posting is more focused on Australia and would have got my replies if posted in the Australian sub forums.

 

[AndrewW2000]

I haven't had much success in trying to upgrade the AU 10 10A 250V tail following the steps.

i. Home is defined and Charge level is set below the current battery level
ii. Car is connected to wifi and all doors closed
iii. Unplugged UMC, plugged into mains, powered on and then connected to the car
iv. Wait a few hours

Also tried increasing the Charge level by 1% and letting it do a short charge/wait a few hours.

And my new MYLR has been plugged into the charger for the past couple of days without it doing anything to enable 10A charging.

I will probably try to fully power off/on the whole car and see if that helps.

 

[arnienz]

Have you had any luck? I'm in NZ trying to update the UMC too but it doesn't seem to want to.

 

[arnienz]

According to this comment on youtube there is a firmware bug preventing UMCs from updating right now.

 

[Anubis]

I too can’t get mine updated.
I saw on FB a comment saying they lodged a service request with Tesla and the reply was that it’s a bug with the current car software version and will be fixed with the next update.

 

[Bolagnaise]

Dropping in to say i also cannot update my UMC. Hopefully next firmware update fixes the issue.

 

[arnienz]

I had a firmware update to my car last night that I hoped would fix it.
Unfortunately the update failed to apply.. so I haven't been able to test.

If anyone else is able to update & test that would be great

 

[arnienz]

Ok so I updated to 2023.20.7 with contained 'bugfixes' - however this hasn't fixed the issue. Confirmed by Tesla Service that my car has tried to push the update but it has failed.

Hoping the next release fixes it..

 

[arnienz]

2023.20.9 is out now and the alerts in the car say "Charge connector update in progress". But it's still limited for 8A for me

 

[Bolagnaise]

I saw a post today on Facebook that says 2023.26.4 contains the bug fix. Will be about 2-3 weeks before most cars see that fix.

 

[ittah]

Confirmed 2023.26.7, UMC updated in Australia. Set car to level below current state of charge (charge complete) , left the car locked, checked back in a few minutes - done 8 to 10amps.

 

[THYRWD]

Mines sorted with the latest release too. Finally!