12 volt or bigger issue? Funky chicken no start

[Ragman]

Went to start our 23 Lariat and truck started sending error codes:

Stop truck now
Frunk error
Passenger door open
Etc

Only into accessory mode, would not start. Cycled it twice, tried to open frunk (wouldn’t), same errors. However on the tablet/screen it said “Screen powered down to protect low battery”.

The HV battery was showing 63% so I assume that means the 12v.

Said a few choice words in Ford’s direction - I just bought our fourth Lightning this morning - tried it again and it started (still showing frunk error).

I’ve got the truck home now and it starts as normal - any simple way to see 12v health? Last time I called dealer it was 2 weeks to rotate tires…. Prefer not to lose the truck for a few weeks if I don’t have to.

If it is a weak 12v, anyone get a warranty replacement or should I just bite the bullet and buy new? If so is a gel or marine/solar better for these trucks?

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[Heliian]

Check the connections, check the battery. Not rocket science, any shop can do that.

 

[Etsquared]

Check the connections, check the battery. Not rocket science, any shop can do that.

Pull the fuse. Right lower panel passenger side, #32 wait five minutes put fuse back in , if fuse NOT blown for a good reason comma should restore try to start while connected to a home charger nothin fancy hope it helps

 

[Heliian]

Pull the fuse. Right lower panel passenger side, #32 wait five minutes put fuse back in , if fuse NOT blown for a good reason comma should restore try to start while connected to a home charger nothin fancy hope it helps

That's the connectivity fuse isn't it?

 

[Ragman]

Interesting, the truck was having connectivity issues earlier in day with Ford Pass App where it couldnt connect to truck. I use PAAK.

 

[Zprime29]

OBDII reader will show you 12v battery info, Ford website will show you 12v SOC. I'd take to Autozone and have them check the battery for free.

 

[Zprime29]

I missed that! I don't check Ford's website that often since I use an OBDII reader.

 

[Ragman]

Thanks half way down that rabbit hole and couldnt find anything - though apparently the truck is in "Excellent state of health" according to Ford.

What's the actual charging process for 12v? If I stick a tender in frunk plugged in and flip propower on while driving as a regular background process will that keep it topped up better then BMS is doing?

 

[Ragman]

Okay this leads me to battery itself is a dud? This truck sees multiple 200+ mile runs a week and lives on a level 2 charger - no logical reason the 12v isnt being kept topped up by the truck itself.

The hassles/cost of it dieing somewhere are way more then preventatively replacing battery.

We'll put it as a 25k mile PM, no other maintenance costs anyway lol. I'm sure we can find home for the batteries in other equipment.

 

[Etsquared]

That's the connectivity fuse isn't it?

Yes TCM my thinking is something is “telling” the battery to drain so “HALT” comes reboot. It worked on F4s in Nam….

 

[Lytning]

I might have missed it in the thread ... have you had the updated 12 volt BMS module replacement completed?

 

[Ragman]

l suspect both counts of this, we likely put more cycles in 3 months then most in year and yes it sat for 12 months on lot before we bought it ($20k off msrp) dealer almost paid us to take it.

I might have missed it in the thread ... have you had the updated 12 volt BMS module replacement completed?

On this truck I asked when we picked it up and was told 2 recalls had already been done (have not received and nothing shows any outstanding) - of our others only one did I receive the BMS recall.

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