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[Logal727]

Oh, crap; my screen has rebooted 3x in the last few days while driving. Was hoping it was an OTA. Now I'm nervous.

this isn’t related

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[Bullitt]

I wonder if fleet purchasers get wind of this if they'll start backing out of these bulk Mach-E orders. Imagine the NYPD not being able to drive their car during an emergency, I don't think they'll have very much patience for stuff like this...

 

[RickMachE]

Have y’all noticed a certain trim this is happening to? Seem like I see mostly GTs? At any rate, it’s a very scary occurrence. OP, I hope this gets resolved quickly.

Unless you've compiled statistics, I don't think that's a valid conclusion. GTs weren't delivered until 2nd half of 2021, yet many of the issues are from early 2021 vehicles.

 

[TonyaE]

Unless you've compiled statistics, I don't think that's a valid conclusion. GTs weren't delivered until 2nd half of 2021, yet many of the issues are from early 2021 vehicles.

It’s was a question, not an answer. I was hoping one of the data experts on here identified a trend.?

 

[RickMachE]

It’s was a question, not an answer. I was hoping one of the data experts on here identified a trend.?

So far I don't see any identifiable trend. Seems mixed on trims, battery sizes, early/late 2021 and now 2022s, ...

 

[dtbaker61]

If OP only had the car a few weeks wouldn’t that update be applied already?

I would suppose that would depend on what the OP's car build date actually was, and if updates to specific modules were available after that.

 

[dtbaker61]

So far I don't see any identifiable trend. Seems mixed on trims, battery sizes, early/late 2021 and now 2022s, ...

the ONLY trend, which is almost impossible to quantify since we don't know how many instances have NOT been reported on this forum, is that the vehicles requiring replacement HVBJB seem to be people that made fairly regular use of DCFC .

It might not even be the MME, it might be flaky DCFC chargers with damaged connectors or bad switching on their side slamming out the juice before the cars are ready, or failing to terminate before cars open contacts.

Until we hear differently, the only proactive preventative steps I can think of is to be SURE that you terminate DCFC charging gracefully by pressing thumb-latch, waiting a few seconds for charger to ramp down and terminate charge, and then disengage. Particularly if the charging is cranking along at full current.

 

[WinterSky]

the ONLY trend, which is almost impossible to quantify since we don't know how many instances have NOT been reported on this forum, is that the vehicles requiring replacement HVBJB seem to be people that made fairly regular use of DCFC .

It might not even be the MME, it might be flaky DCFC chargers with damaged connectors or bad switching on their side slamming out the juice before the cars are ready, or failing to terminate before cars open contacts.

Until we hear differently, the only proactive preventative steps I can think of is to be SURE that you terminate DCFC charging gracefully by pressing thumb-latch, waiting a few seconds for charger to ramp down and terminate charge, and then disengage. Particularly if the charging is cranking along at full current.

Where is the "thumb-latch" ? in the Car or the DCFast Charger ?

 

[scoopman]

the ONLY trend, which is almost impossible to quantify since we don't know how many instances have NOT been reported on this forum, is that the vehicles requiring replacement HVBJB seem to be people that made fairly regular use of DCFC .

It might not even be the MME, it might be flaky DCFC chargers with damaged connectors or bad switching on their side slamming out the juice before the cars are ready, or failing to terminate before cars open contacts.

Until we hear differently, the only proactive preventative steps I can think of is to be SURE that you terminate DCFC charging gracefully by pressing thumb-latch, waiting a few seconds for charger to ramp down and terminate charge, and then disengage. Particularly if the charging is cranking along at full current.

Not true for me. I almost always use L2 at home. I did do a extensive DCFC about a week prior to my failure from 0- 100% however.

 

[scoopman]

I would suppose that would depend on what the OP's car build date actually was, and if updates to specific modules were available after that.

I had every available FDRS update when my car failed in my garage.

 

[dtbaker61]

Where is the "thumb-latch" ? in the Car or the DCFast Charger ?

I'm talking about the latch on the charger handle that snaps in place when you plug in to hold the handle in firmly while charging. When you depress the 'release' to disengage, it sends a signal to charger to cut current. I would suggest depressing the release, waiting about 3 seconds, and THEN pulling the plug.

 

[BadgerGreg]

Have y’all noticed a certain trim this is happening to? Seem like I see mostly GTs? At any rate, it’s a very scary occurrence. OP, I hope this gets resolved quickly.

It's happening to early builds AND newer builds. I have a hunch that there may be something wrong with the HVBJB design. When they replaced my HVBJB last month, the replacement unit failed almost immediately. That said, my car is technically on its THIRD HVBJB already. I hold my breath every time I attempt to start the car.

 

[BadgerGreg]

I'm talking about the latch on the charger handle that snaps in place when you plug in to hold the handle in firmly while charging. When you depress the 'release' to disengage, it sends a signal to charger to cut current. I would suggest depressing the release, waiting about 3 seconds, and THEN pulling the plug.

When DC fast charging, I always disengage the charger first using the UI on the charger unit. I then wait about 15-20 seconds before unplugging. At that point, there is no electricity flowing as the plug is pulled.

 

[Cm12]

the ONLY trend, which is almost impossible to quantify since we don't know how many instances have NOT been reported on this forum, is that the vehicles requiring replacement HVBJB seem to be people that made fairly regular use of DCFC .

It might not even be the MME, it might be flaky DCFC chargers with damaged connectors or bad switching on their side slamming out the juice before the cars are ready, or failing to terminate before cars open contacts.

Until we hear differently, the only proactive preventative steps I can think of is to be SURE that you terminate DCFC charging gracefully by pressing thumb-latch, waiting a few seconds for charger to ramp down and terminate charge, and then disengage. Particularly if the charging is cranking along at full current.

I thought that was the case too for a while, but others who have had this HVJB issue made minimal use of DCFC. I don’t think there’s been any clear trend, yet. But doing as you suggest is a great idea, and the same should probably be done when disconnecting a L2 charger since it doesn’t lock in the same way as CCS. Allowing it to have a few seconds between when you press the button on handle and when you pull it out at least allows the current to shut off and may prevent arcing.

 

[dtbaker61]

It's happening to early builds AND newer builds. I have a hunch that there may be something wrong with the HVBJB design. When they replaced my HVBJB last month, the replacement unit failed almost immediately. That said, my car is technically on its THIRD HVBJB already. I hold my breath every time I attempt to start the car.

hhmmmm, I wonder if there is any higher failure rate with the ER battery packs versus SR ? The internal configuration, voltages, etc is different... but we don't really have all the data needed to see a trend one way or the other.

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