21 Powerboost SSN Low Battery

[Snakebitten]

Anyway to send me that dashboard lol

Search for threads with OBDlink in the title. I think there are 2 or 3 that are several pages long.
The dashboard above, as well as a couple of others are available in those threads. (export file that you would import)

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[Musclez]

Interesting cleared codes this morning and lost power again. Codes loaded

 

[Gros Ventre]

Do you have another car/truck? Try swapping out, temporarily, that battery into the F150 and see. If no change try swapping that battery into the small battery position and see. Snakebitten is on the mark when he notes that Ford's troubleshooting eliminates these batteries as a possibility. Something is causing a premature drop off of system voltage during the shutdown sequence.

 

[Snakebitten]

Describe "lost power" please

 

[Gros Ventre]

Describe "lost power" please

The info I looked up for the code says that during engine shutdown there is a download of code/data in the system. There is apparently a relay associated with that. It is opening prematurely de-energizing the memory before the download is complete. Something is turning off, relay dropping out, or battery voltage dropping too low.

 

[Musclez]

It goes to full accessory no engine power no electric. Stalled at a light for me. Not sure wtf to do anymore. Traveling about 100 miles a day this week and had to get a rental because can’t trust this thing. Idk where to go from here.

 

[Snakebitten]

I believe someone has to go through the entire pinpoint test procedures in sequence. It's literally a process of elimination exercise.

As frustrating as it must be to be confronted with the issue, I'm an optimist in regards to the issue being finite and fixable. There IS a remedy. But the method of narrowing it down isn't flexible. It's actually logical, from the perspective of the manufacturer.

Example: according to the pinpoint procedures, you could simply have a faulty negative lead. That's all it would take. So that has to be eliminated.

 

[Musclez]

I believe someone has to go through the entire pinpoint test procedures in sequence. It's literally a process of elimination exercise.

As frustrating as it must be to be confronted with the issue, I'm an optimist in regards to the issue being finite and fixable. There IS a remedy. But the method of narrowing it down isn't flexible. It's actually logical, from the perspective of the manufacturer.

Example: according to the pinpoint procedures, you could simply have a faulty negative lead. That's all it would take. So that has to be eliminated.

So you recommend I try to follow those procedures?

 

[Snakebitten]

If you are up to it, sure.

You mentioned you were technically inclined, and with the proper tools it seems fairly straight forward.
Or at least check/verify the parts that do make sense to you?

Lot's of good light.
Perhaps some cheaters or magnifying glasses to see really up close for harness connections.

Although I find it ridiculous that a dealership couldn't/wouldn't judiciously follow the Factory Service Manual pinpoint procedures. The manual is 18,000 pages of holding their hands. And they are starting off with a DTC code that at least takes the guess work out of where to begin.

I'm stubborn enough to go at it myself before I accept defeat and take a depreciation hit. Especially on a vehicle that when performing as designed is such a magnificent machine.

 

[Musclez]

Back from dealer ford won’t buy it back because it’s beyond 24 month ability of buy back? Lemon law time? I’m at a loss boys. Battery swap maybe try this?

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