Completely DEAD!!

[generaltso]

Can't it be jumped from another vehicle to get some charge?

It's worth trying, but it depends on the problem.

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[MoonRiver]

It's worth trying, but it depends on the problem.

I would ensure the LVB has no 12v first.

 

[Blue highway]

Is there a physical key in the fob to open the door ?

I ask because I am new to the MME...

no physical key.

Your option if the 12v battery is completely dead is to open the Frunk with remote power and then charge the 12v battery.

 

[Jimct]

This happens more than you think with a lot of EV's. Odds are the 12V battery isn't really dead. Jump start it (if you don't have a portable jump starter get one), start the car. There's a good chance everything resets and is fine after that.

 

[DaMeatMan]

He will not. If you re-read his post, he stated the window is open and he's in the car. He simply needs to pull the frunk opening twice to open it.

Looks like I missed that. ? ?

 

[MoonRiver]

Just plugged in a cigarette lighter socket voltage reader with power switch off It read 13 volts. SOC is 90%. Got the reader from eBay for 3 bucks.

 

[roamtheworld]

@Mv10858 Make sure you send a DM Direct Message to @Ford Motor Company with your details. They will need to get the BEV team engaged to help you. I saw you replied to the thread but they may not see your reply.

 

[Mike G]

Is there a physical key in the fob to open the door ?

I ask because I am new to the MME...

It's a blank. There's no door lock cylinder to stick one in.

 

[Jimbo]

Use a multimeter to measure the cigarette lighter socket voltage if it’s 12 volts. If not then it’s LVB. Are you sure it was charging the whole time?

The 12v socket is not permanently connected to the LVB. It shuts off 10-30 minutes after the car does.

 

[MoonRiver]

The 12v socket is not permanently connected to the LVB. It shuts off 10-30 minutes after the car does.

The LVB gets charged as the charger plugged in, this is the only way it keeps charged. but I have read some of the 21 models don't get charged.
You don't need the lighter socket permanently connected to the LVB, you only need a few seconds to measure the voltage before the accessory power shuts off including the radio.

 

[MachTee]

I never had this happen in my 19K mile ownership of the MME. This did happen to me once within 2 months of owning the Genesis GV60. A portable 12V battery jumper brought it back to life instantly. I've since put on a bluetooth 12V battery monitor and learned a little bit about the 12V battery in an EV.

The voltage will always read lower when the car is awake. While the car is awake, the lowest I've seen was 12.2V, 12.4 is more typical, which makes sense since the electronics are drawing on the 12V battery, lowering the voltage reading. It takes about 6-8 minutes after closing all doors/hood/trunk for it to go to sleep. While it's sleeping and fully charged it reads 12.9V, but 12.7-12.8V is more typical, and lowest I've seen was 12.6V and the car will top it off with the HV battery. When the car is started, it will always read 14V+.

To get a true reading the car has to be asleep. I assume the MME works similarly, while the car is asleep vs awake vs "engine" running. This is the graph when I checked on it last on my GV60. Those little dips at around 12.5V is when the car is awake.

 

[generaltso]

The LVB gets charged as the charger plugged in, this is the only way it keeps charged.

That's not the only way.

 

[woody]

Just an FYI, your MME is a 2021. Your profile says it's a 2022.

Wow. That is bizarre. My screen has his profile showing as a 2021 Mustang Mach E GT

 

[generaltso]

Wow. That is bizarre. My screen has his profile showing as a 2021 Mustang Mach E GT

Looks like he changed it. No biggie. Just wanted to make sure he knew he had a 2021.

 

[Mv10858]

The LVB gets charged as the charger plugged in, this is the only way it keeps charged. but I have read some of the 21 models don't get charged.
You don't need the lighter socket permanently connected to the LVB, you only need a few seconds to measure the voltage before the accessory power shuts off including the radio.

So if it is charged when plugged in, it should be charged fully especially after sitting for 36 hours plugged in. Has to be more to it.

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