TSB 21-2091 - 12-Volt Battery Becomes Discharged While The Vehicle Is Plugged In During the High Voltage Charging Process

[breeves002]

The MME's first TSB! New software to fix LVB issues.

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[GoGoGadgetMachE]

this appears to formalize the fixes we already knew about, partially because of people like @ChasingCoral and @eponyinIL going through all the early pain they went through. good it's formally acknowledged I guess, sorry it happened at all though.

 

[ChasingCoral]

The MME's first TSB! New software to fix LVB issues.

You're welcome. BTW, Marlin hasn't had any more 12v drain problems.

 

[BMT1071]

The MME's first TSB! New software to fix LVB issues.

I'm amazed they're paying actual time!

 

[generaltso]

It’s good to see a formal TSB for this issue. I wonder why the issue only affects some cars built before 2/3. If that’s the date they changed the software in the factory, you’d think all cars built before that date would be affected. Since it’s not a recall, I guess we’ll have to wait and see if our 12v batteries die to know if we‘re affected.

 

[KAustin]

It’s good to see a formal TSB for this issue. I wonder why the issue only affects some cars built before 2/3. If that’s the date they changed the software in the factory, you’d think all cars built before that date would be affected. Since it’s not a recall, I guess we’ll have to wait and see if our 12v batteries die to know if we‘re affected.

The challenge is knowing IF it was fixed already. That may have been part of the delay for my car. It did not go to the KC Speedway, but did sit in MX for two months with the delivery date being pushed back a couple of times.

 

[Kamuelaflyer]

The challenge is knowing IF it was fixed already. That may have been part of the delay for my car. It did not go to the KC Speedway, but did sit in MX for two months with the delivery date being pushed back a couple of times.

Probably a combination of all of the above. Software and Firmware updates (QA and dealer) on vehicles not delivered. Factory updates for those of us after that date (2/10 for me). And I'd bet part of this was also in OTA number 1 which just launched.

The good news in all of this is that the number of LVB draining incidents seems to be low and we know it's not a hardware issue given the contents of the TSB. With all the chip shortages, not needing to replace hardware might be a very good thing.

Thanks for posting this @breeves002. I've added it to my MME technical file.

 

[mixduptransistor]

The good news in all of this is that the number of LVB draining incidents seems to be low and we know it's not a hardware issue given the contents of the TSB. With all the chip shortages, not needing to replace hardware might be a very good thing.

Given the timeframes on some states' lemon laws, Ford could get in a bind if any major issues arise requiring new modules....

 

[fayt349]

How do I check my cars build date? I didn't put a reservation I just bought it at the lot.

 

[KAustin]

How do I check my cars build date? I didn't put a reservation I just bought it at the lot.

Use the Tracker at the top of this page.

 

[fayt349]

Use the Tracker at the top of this page.

It didn't work. It just says Can't Retrieve This VIN

 

[generaltso]

How do I check my cars build date? I didn't put a reservation I just bought it at the lot.

You can narrow it down to the month by looking at the sticker inside the drivers door jamb.

 

[CHeil402]

It didn't work. It just says Can't Retrieve This VIN

It says that, but if you click on any of the tabs, like "General Information" it will show it.

 

[generaltso]

It says that, but if you click on any of the tabs, like "General Information" it will show it.

Not if it's already been delivered. It gets removed from the tracking database shortly after.

 

[Ciero]

The MME's first TSB! New software to fix LVB issues.

I appreciate you posting these for us!