2014 Ford Focus Electric - 39,330 miles as of 04/20/17 - all recalls/updates completed
Last fall, had 2 SSNs, both coming to a stop after driving slowly in a residential neighborhood. Normal re-set of the car worked. I took the car in and Ford had it for a few days and were about to pull the HVB, but then decided to reload the software. Car was fine until end of February.
From February 24th until April 20th, I experienced 10 separate SSNs. At first, similar to last fall, driving slowly (residential area) coming to a stop with the SSN warning and normal re-set. Then, instead of a warning at or approaching a stop, it didn't occur until I started moving after a stop. A couple of times, I was able to continue to drive with the SSN message on, which was weird. I did it just to see what would happen and nothing happened. The other times, when pressing down on the accelerator after a stop, the car would lurch, the SSN would signal and the car would stop/die. Toward the end, it was happening after a long wait at a red light, press down on the accelerator, lurch and die. I was always able to re-set the car. It was interesting to see how the SSNs were happening in similar circumstances, but changing slightly (almost stopped, to completely stopped, to attempting to move again, then almost guaranteed at a long stop).
Normally, I downshift to L when approaching a stop. I changed to braking only. That didn't seem to help. At first, the SSNs were a few weeks apart, then got to be nearly every day, and two times twice a day. The last few days before the appointment, every time I came to a stop, I put the car in park as I waited for the light to change or was just at a stop sign. Once ready to move, shift to drive and off I went without an SSN. I may have just been lucky doing this. It's not the most efficient way to drive. I also was probably lucky not to have a situation where I couldn't re-set the car.
I get the car to the dealer. The dealer was able to replicate the SSN. The dealer worked with the Ford hotline for several days testing this and that. Finally, they found that the "HVB disconnect not latching all the way and causing same message (SSN) to come on." They replaced the disconnect switch. I picked up the car on May 2nd and all seems right with the world. It might take me a few more days not to constantly monitor the traffic situation (for a possible SSN) or looking down at the dash expecting to see an SSN when I take off from a stop to driving normally without the stress of SSNs.
The Ford service guy was funny. He said working on this car reminded him of the Geico commercials with the guy saying "I'm not a security guard, I'm a security monitor..." The car's software was clueless as to what the problem was, but it knew it had a problem. My MyFordMobile account did document the SSNs with "Warning light on".
I could have taken the car in right away, but I live in a mostly rural area, and I was closely monitoring what was happening with making notes on my iPhone (mileage mark, time, when the SSN alert happened). Then, I became curious as the timing of the SSNs changed. I told the Ford folks all of this. The SSNs only happened at stops. The few times with people behind me, they had wait 13 or 14 seconds until the car re-set.
Anyway, I just thought I'd post this so that if anyone else has a similar issue they might want to have Ford look seriously at the HBV disconnect switch.