My 23-2317 TSB update was done several weeks and 1000 miles ago with no new problems. I’ve only had the SSN one time.I went to fetch the truck from the barn a few minutes ago.
THIS IS EXACTLY why I think these trucks get misdiagnosed by dealerships and they don't know that the battery is potentially the culprit because it momentarily is not providing adequate voltage. And it only takes a moment, a crucial moment to be exact, for the truck to experience some crazy behavior.
Note the timestamps of each snapshot. This all takes place quickly.
I take a reading of the static voltage BEFORE approaching the truck.
Looks fairly good, right?
(other than the fact that 12.56V is considered 67% SOC, but Ford's BMS thinks the battery is about 80% SOC)
Ok. Now ALL I do is walk up to the truck. I haven't touched anything, but it wakes up to the FOB proximity.
Immediate voltage drop!
CrAzY, right?
This is why I do the now infamous "2-step" Powerboost starting technique. (It's not because I have ever been stranded by SSN)
I hit accessory power only.
Immediately the DC/DC converter (electronic alternator) kicks in and provides a healthy dose of LV voltage to the entire 42 module ensemble that makes up my truck.
Gotta love the Powerboost for this ability! I wish my Nissan Leaf EV did the same.
Makes me feel better every time I see that 13V+ BEFORE I hit the start button. ?
I then hit the start button and the BMS says "maybe we should increase the SOC of that AGM".
Yea, you do that please.
(better late than never, I guess)
