Is this a 12V battery post? Stop safely now (x2)

atacama

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Both this morning and late this past November, I went to my Boston area drive to drive the Pony, and after turning it on, immediately got a Stop Safely Now error. Neither time did I see error codes or any foreshadowing such as the turtle. Both times I used Roadside Assistance within the Ford app to get it towed to the dealer. Both times, in the time it took for the tow to arrive, it eventually started up and so the tow driver was able to drive it on the bed.

Checked these forums on that Nov day and did see evidence of 12V problems - suggested this to the dealer. They claimed it was fixed a few days later and I picked it up, and the rep had no diagnosis or tech info for me. There was some phone tag about getting the diagnosis but I gave up. I figured it was some 12V issue that was resolved.

All good until this morning. The dealer says their EV tech is backed up and they won't get to it for 3-4 weeks.

By now I've read @desiato's thread -- some good coincidences there but here are my details:
-Miles and age well within the main warranty.
-Battery is 2.5yo since assembly; 2.2 since delivery.
-Boston
-usage: many days 5-10 miles, rare days 0, rare days 50
-charge 1-2 x per week, sometimes 20 -> 80, sometimes 50 -> 80
-charge rate has always been 50A but I now see I can set it anywhere 6-50 in my Autel app
-I don't have ODB whatever nor a battery tender nor have I put holes in the panel over the battery ports. Car maintenance not an interest but I'll up my game if the payoff is big.
-parked in the drive

The car does wake up a fair bit when I go by (due to Paak) with the dog etc. I prob could leave it unlocked. I def could charge at a lower rate. I haven't found the original thread with the trick for charging by using the blower (help please?).

I'm confident this community will be more useful to me this week than the dealer. Gratitude!
1. Does this sound like a 12V problem?
2. Does it seem reasonable to retrieve it from the dealer now (before they touch it), follow advice here on 12V maintenance, and expect this to be a reasonably sustainable solution?
2a. Should part of that be replacing the battery?
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GKar

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Interested to see responses. I have the almost identical model, year and build date. Also live outside Boston and had an identical Stop Safely experience on December 23rd. Towed to dealer who wasn't able to even look the car for almost three weeks, at which time they told me that two of the High Voltage Battery Modules are bad and need to be replaced. It will take 2-3 weeks to get the part in and another 2-3 weeks after that before they can do the work. And that only if things go well. At best, I will be out of car for almost two months. Dealer has only one EV tech and one EV bay. Very frustrating.
 

MoonRiver

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If you can secure the date when your dealer can look at it I would take the car back and play with the charger current, say drop it down to see if it helps.
 

desiato

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@GKar @atacama which Boston-area dealer(s) did you talk to during this? Sentry Ford in Medford is the one closest to me, but they don't seem to be too EV-savvy or at least have minimal experienced EV staff (like, one guy).
 

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@atacama have you had the HVBJB recall done? It could be the junction box.

I would definitely get my car back and find another solution or another dealer with EV tech availability. You can also change the 12v for less than $150 (I know you still have a warranty). It’s not that hard to do. You should also find a suitable solution for waking the car up too many times. That can’t help.

Good luck to you.
 


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atacama

atacama

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@GKar @atacama which Boston-area dealer(s) did you talk to during this? Sentry Ford in Medford is the one closest to me, but they don't seem to be too EV-savvy or at least have minimal experienced EV staff (like, one guy).
Sentry it is. Yes they’ve told me it’s one guy. With some prior issue they told me he’d need to have corporate teach him the finer points (I later learned this is done over a video call).
 
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atacama

atacama

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@atacama have you had the HVBJB recall done? It could be the junction box.
I felt very fortunate when it was built that they had made the fix to the HVBJB design and implemented it on the line a few months prior.

I would definitely get my car back and find another solution or another dealer with EV tech availability. You can also change the 12v for less than $150 (I know you still have a warranty). It’s not that hard to do. You should also find a suitable solution for waking the car up too many times. That can’t help.

Good luck to you.
Your advice much appreciated
 
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atacama

atacama

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I may give Bonnell in Winchester a call. @GKar, @desiato - either of you have experience with them?
 

desiato

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I may give Bonnell in Winchester a call. @GKar, @desiato - either of you have experience with them?
No, the only other Ford dealership I've been to is McGovern in Saugus in Feb 2023. They replaced my APIM and addressed some other items; I can't remember all of them. But they seemed EV savvy.
 

GKar

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Unfortunately, my car died while I was on Christmas vacation in NY. So it’s stuck in NY with a dealership that was closest to my tow location. Sorry I can’t help.
 
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atacama

atacama

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Unfortunately, my car died while I was on Christmas vacation in NY. So it’s stuck in NY with a dealership that was closest to my tow location. Sorry I can’t help.
Ouch, sorry this happened to you
 

MoonRiver

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Ouch, sorry this happened to you
That is what worries me. If my car should die hundreds of miles away from home I would have to get it fixed there and stay there until it's derivable. Only god knows how long and how much would it be.
I sure will replace my battery which installed in may 2022 before any out of town trip.
 

desiato

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I may give Bonnell in Winchester a call. @GKar, @desiato - either of you have experience with them?
Well, it finally happened. Full-fledged SSN when turning the vehicle on yesterday morning, and an overnight "Charge fault". Sentry couldn't give me a better estimate than "2-3 weeks" before they could look at the vehicle. McGovern in Saugus can apparently look at it next Monday, possibly earlier. Tow truck on the way now.

Secondarily to this, I noticed that our Grizzl-E's status light was no longer on. Took a look at the NEMA 14-50 outlet and found THIS. Could the MME do this??? I have not yet opened up the Grizzl-E to see if the insides are intact. This did NOT trip the circuit breaker.
Ford Mustang Mach-E Is this a 12V battery post? Stop safely now (x2) PXL_20250203_153008270
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