Won't do update

[Deleted member 21798]

Despite repeated attempts the truck keeps telling me update failed because of low battery.
i installed a new 12v battery and keep it ALL on charger every nite but still no go. WTF

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[bmwhitetx]

Keeping it on the EV charger is of minimal help. What has worked for me is to turn the truck on (with headlights, HVAC off) for about 6 hours in the late evening, have the 12V battery on a battery tender, and let it update at the scheduled 1:00 am.

There are a ton of threads on this already. Do a search on the specific update that is failing (it's probably this charge port one) and read all the other comments about how folks ultimately succeeded.

Also I couldn't help but note your 100-year old truck!

 

[Deleted member 21798]

Its on the battery tender all the time. Thanks

 

[TaxmanHog]

Edit your vehicle details under the Account Details link on the forum.

suggested 2023 F150 Lightning

 

[TaxmanHog]

As for the failing updates, make sure the keys and PAAK enabled devices are not moving at or around the time the update is in process.

Are you doing this manually or letting the process execute automatically at a defined time?

 

[chl]

If it tells you it's because of the 12v battery, then it must be. A maintainer can take several hours depending on the SOC to reach the level needed for some updates around 85% SOC or above.

I keep mine on a maintainer all the time and have not issues.

It MUST be connected like this with the NEG connect DOWNSTREAM of the BMS sensor or else the truck will not know the actual battery SOC because it does coulomb counting (detects charge current and uses that as the basis for the SOC).

Also, did you reset the BMS when you put in the new battery?
If not do this:
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VB BMS reset

Make sure 12v battery is fully charged (drive an hour, or after an hour actively charging the HVB)
Start Accessory mode
flash high beams 5 times
step on brake pedal 3 times
red battery icon on dash should flash 3 times

If the dealer changes the 12v battery, they should do this, but they don't always. If they plan on keeping it overnight, there is a good chance they will - Just ask when you pick it up.

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When all else fails, try one of these techniques:

https://www.macheforum.com/site/threads/how-to-get-failed-otas-to-install.29749/

Or get the dealer to install the update...

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