HVBJB fail during remote start in cold weather.

[Matstar]

Ford specifies that it is the fast charging and the full throttle accelerations which cause the problem with the HVBJB.

However, it seems that simply starting the car with the heater on high during very cold temperatures can also cause the problem.

Here, Quebec, Canada, we see very few people in the summer dealing with the problem. On the other hand, during the winter, every morning when it is very cold (-15C, 5F) there are posts on social media from people with car does not start and displays all the codes related to the HVBJB problem. Some may just have a 12V problem. But for many it happens even though the 12v is OK and the car is plugged in.

And that's exactly the problem I had on the 2021. On a very cold morning, when it was plugged in all night, the remote start refused to work. When I sat in the car to start it, all the codes appeared one after the other and the car would not start.

Car Scanner indicates that 12V is at 83%. And strangely, the HVB is -10C. It should be approximately between -5C and 5C as the car has been plugged in all night and normally therefore keeps the HVB at a warmer temperature.

Anyway, she left on the tow truck. The dealer confirmed the next day that the problem was the HVBJB. Parts have been on order for 3 weeks. So I have no idea when I will get my car back.

All this to say that it seems that the problem can also happen without doing fast charging or doing any full throttle accelerations.

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[Maquis]

The effects of DCFC and other hi-amperage events can be cumulative. It‘s likely the power up of the heater in the cold was the proverbial straw.

 

[Matstar]

I really feel like that the cold temperature and start-up relationship with heating at Max is one of the source of the problems with the HVBJB.

the last two nights have been quite cold and since this morning there have already been several posting on FB pages that their MME does not start and displays all the error codes relating to an HVBJB problem.

 

[Adventureboy]

I have the Premium AWD ER. The part was ordered on January 19th. Car has now been down for 5 weeks and counting. No idea when Ford will ship the part.

 

[silverelan]

Sorry to hear the HVBJB failed on you. Hopefully you get it repaired soon with the improved part.

 

[Matstar]

I'm not sure why the problem seems to be getting worse over the past few days. but just this weekend, on a small Facebook page from Quebec, there are already a dozen, (edit) now more than twenty people reporting that their cars won't start and displaying all the error codes relating to the HVBJB problem.

It seems to be almost all 2021 Premium big batteries.

This is the first time I've seen so many in such a short time in two years.

 

[Matstar]

Still on the same Facebook page, today 6 others peoples have now the problem with their car which does not start .

They all seem to be 2021s with big batteries.

It's starting to look like a lot in few days to be just a coincidence...

 

[Tampamike]

That’s disturbing …

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