Recall Information: High Voltage Battery Junction Box (23S56)

[Mach-Lee]

Hi, First time poster. Just purchased my 2021 GTPE last week knowing it had this upcoming recall. My car has 18K miles on it. I've read every word on every page of this thread to try and understand completely what the HVBJB recall is all about.
As a retired Quality Engineer I can calculate and understand many of the stats associated with the measurement of quality metrics. What I don't see (if it's out there, somebody point me in the right direction) is how many of the HVBJBs are expected to fail. Is it simply a function of time - mileage - WOT launches and that they will all eventually fail? Or will only 10% eventually fail? Or 50%? What does Ford say will be the eventual body count?

It's my informed opinion that almost all the original HVBJBs will eventually fail. It's a question of when, not if. Median about 15k, most fail by 50k, and practically all but a small few (10%?) will last 100k. Function of part quality and driving habits.

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[AKgrampy]

It's my informed opinion that almost all the original HVBJBs will eventually fail. It's a question of when, not if. Median about 15k, most fail by 50k, and practically all but a small few (10%?) will last 100k. Function of part quality and driving habits.

You are probably more right on than my thoughts. I hope my GT holds out until the parts for the recall are readily available. Maybe our single digit temps will help keep it cool over the winter!

 

[kennethjk]

You are probably more right on than my thoughts. I hope my GT holds out until the parts for the recall are readily available. Maybe our single digit temps will help keep it cool over the winter!

Once certain way to make sure parts are available before a fail. Don’t drive it. Other than that it is a crapshoot.

 

[AKgrampy]

Once certain way to make sure parts are available before a fail. Don’t drive it. Other than that it is a crapshoot.

Not going to happen! Also not worried about it. Just drive it like normal. Obviously it would be better to schedule a change out versus a SVS error but not going to change any driving habits.

 

[GT-Papa]

Thanks all. Since I cannot know how my car was treated before I adopted it, I will treat it gently as much as possible with my L2 charger and hope for some remedy to appear soon. Except all my neighbors now want to get to 60 in 3.5 seconds. How can I refuse?!

 

[YunniorO]

Sorry but maybe I’m not understanding something fully - what about us who just had an HVBJB replacement not even months ago? Has anyone confirmed if there is an updated part? The part number I had installed was NK4Z10C666C - has anyone noticed a newer part number? Really hoping I won’t have to spend more time at the dealer with another updated part, but it’s worth the wait if it genuinely is an updated part.

 

[HuntingPudel]

Thanks all. Since I cannot know how my car was treated before I adopted it, I will treat it gently as much as possible with my L2 charger and hope for some remedy to appear soon. Except all my neighbors now want to get to 60 in 3.5 seconds. How can I refuse?!

If you have a good EV dealer near you, don't sweat it. A really good dealer can get you in and out in a couple of days. If you have a great relationship with your dealer's service department, you could get in and out in a day if you have the codes. ??

 

[HuntingPudel]

Sorry but maybe I’m not understanding something fully - what about us who just had an HVBJB replacement not even months ago? Has anyone confirmed if there is an updated part? The part number I had installed was NK4Z10C666C - has anyone noticed a newer part number? Really hoping I won’t have to spend more time at the dealer with another updated part, but it’s worth the wait if it genuinely is an updated part.

There has been no confirmation that the part is changing (or not changing). I had my HVBJB replaced in late August (with a remanufactured version of the part that went online in late May of 2022). My car's VIN fell off of the recall list. ?‍?

 

[YunniorO]

There has been no confirmation that the part is changing (or not changing). I had my HVBJB replaced in late August (with a remanufactured version of the part that went online in late May of 2022). My car's VIN fell off of the recall list. ?‍?

I haven’t checked my VIN since the initial CarFax notice I received. I just checked the NHTSA website and now it’s showing 0 unprepared recalls. So maybe the part I received really is the most up-to-date version.

To be fair, I have had zero issues with my car since the repair. It’s been working great, did get held up with the 6.1.0 update with 2021 vehicles, but other than that it’s been working flawlessly.

 

[RickMachE]

Mine was replaced with the RM part and is still on the recall list.

 

[Astraea]

Until parts are ready, we ask that affected customers limit repeated back-to-back wide open pedal accelerations and use DC Fast Charging only when necessary.

??? nah...I go zoom zoom as much as I can! If my car fails again, there is no way the experience will be anywhere close to as bad as the first time it happened! I'll drive my car like I stole it like I always do, and make an appointment to get the recall done. If it fails before that happens then I get pushed to the front of the line, win win!

 

[hack-e]

Mine was replaced with the RM part and is still on the recall list.

Mine too. Just checked again. It's only been about 4 weeks since mine was replaced with the RM part.

 

[sookestang]

Thanks all. Since I cannot know how my car was treated before I adopted it, I will treat it gently as much as possible with my L2 charger and hope for some remedy to appear soon. Except all my neighbors now want to get to 60 in 3.5 seconds. How can I refuse?!

I just had my HVBJB replaced. Don't baby the car, enjoy it.

Yes, it took a month to get the part, installation was only a day, and it sucked not having the car, but I bought the MME because of the performance and I'm going to continue to use it as such. If another HVBJB goes, it will still be under warranty. They can continue to install as far as I'm concerned.

 

[Gatorguy]

I am confused. I just (2/1/2024) had the 23S56 recall completed on my 2021 Premium AWD Ext Range Mach-E by a Ford dealer. The replacement part number listed on their invoice is NK4Z-10C666-CRM. However, the "Labor Allowances and Parts Ordering Information" sheet for Safety Recall 23S56 specifies that part number NK4Z-10C666-E be ordered for All wheel drive (non-GT) vehicles. Did they install the wrong part?

Hi Mustang Mach-E Owners,

Ford Motor Company has issued a recall for Certain 2021-2022 model year Mustang Mach-E extended range and GTs built between May 27, 2020 to May 24, 2022 related to failures of the High Voltage Battery Junction Box (HVBJB).

If your vehicle is included in this recall, you will receive a message from Ford soon with next steps.

In the meantime, you can also verify if your vehicle is included by entering your VIN at www.ford.com/support/recalls/

What is the issue tied to this recall?
Direct Current (“DC”) fast charging and repeated wide open pedal events can cause the high voltage battery main contactors to overheat on certain Mustang Mach-E extended range and GT models. Overheating may lead to deformation of the electrical contact surfaces, which can result in a contactor that is prevented from properly closing or a contactor that welds closed. An overheated contactor that is prevented from properly closing while driving can result in a loss of motive power.

What is the cause of the issue?
The high voltage battery main contactor is not robust to heat generated from multiple DC fast-charge and wide-open pedal events. A prior software update improved monitoring and management of the main contactor. Damage to the extended range and GT contactors caused by wear prior to the software update may reduce the effectiveness of the software.

What is the expected repair?
Once parts are available, owners will be asked to take their vehicle to a Ford dealer to replace the High Voltage Battery Junction Box.

Do I still need the software update related to this recall if I haven’t yet received it?
Yes.

Which vehicles are affected?
Certain 2021-2022 model year Mustang Mach-E extended range and GTs built between May 27, 2020 to May 24, 2022.

Why are Standard Range vehicles not affected?
Standard range contactors are not included because of the difference in heat generated in the contactors. The extended range and GT vehicles will see more current flow through the contactors than the standard range due, in part, to larger battery capacity and higher output electric drive motors.

What are you doing to take care of customers?
We are working through how we will support affected owners, including providing rentals and pick-up and delivery services.

Is there anything a customer can do to reduce the chance of the contactor overheating until their vehicle is repaired?
Until parts are ready, we ask that affected customers limit repeated back-to-back wide open pedal accelerations and use DC Fast Charging only when necessary.

Is there a warning sign that customers should be aware of?
For vehicles that previously received the software update in most cases, the software will proactively detect damage to the contactors and display a warning wrench light. If the contactors weld closed while driving, there will be no immediate effect on vehicle operation. Upon the next key cycle, a wrench light will be illuminated, and vehicle will not start. If the contactors are prevented from properly closing while driving, a wrench light will be illuminated, the vehicle will display “Stop Safely Now” and the vehicle will immediately lose motive power. The vehicle will coast to a stop, and all low voltage systems including power brakes, steering and lights will remain functional.

When will you notify customers of the recall?
We began sending letters to customers on November 3rd. Customers can also verify if their vehicle is included by entering their VIN at www.ford.com/support/recalls/

Will there be a charge to customers?
Customers will not be charged for service.

What is Ford’s reference number for this recall?
The reference number is 23S56.

 

[AKgrampy]

I am confused. I just (2/1/2024) had the 23S56 recall completed on my 2021 Premium AWD Ext Range Mach-E by a Ford dealer. The replacement part number listed on their invoice is NK4Z-10C666-CRM. However, the "Labor Allowances and Parts Ordering Information" sheet for Safety Recall 23S56 specifies that part number NK4Z-10C666-E be ordered for All wheel drive (non-GT) vehicles. Did they install the wrong part?

I am not saying this is accurate but the sense I get from reading the forum is there are some owners receiving the remanufactured part versus a newly built part during the recall work. I do believe the RM part has had its contactors replaced with the same ones now used in the new part. Other than the contactors I have not read of any difference between new and original units and visually they look exactly the same. What I can’t answer is whether it was appropriate to use a RM part vs the E part to satisfy the recall. But it is the right part for your car and many have been receiving it for warranty repairs.

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