System Off to Save Battery message

[ijdetoro]

BEV, ICE, HVB, LVB, To many abbreviations! Like doctor lingo, I which people spend a little time to write more self explicit!

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[bmwhitetx]

BEV, ICE, HVB, LVB, To many abbreviations! Like doctor lingo, I which people spend a little time to write more self explicit!

You'll regret that requirement after typing in your 1000th post and having to spell everything out for the newbies.

Lexicon here: https://www.macheforum.com/site/threads/acronyms-tlas-and-initialisms.6365/

 

[ijdetoro]

I understand! I don't think is about newbies, is more about people that are second language trying to understand a useful information that your sharing, that all, take a little time but is well appreciated!

 

[Scorpio3d]

BEV, ICE, HVB, LVB, To many abbreviations! Like doctor lingo, I which people spend a little time to write more self explicit!

I have figured out most of it, but if I ever have a question, I just ask Siri(if you’re on the dark side-LOL)you can just ask Google…pretty easy!
Some people on here are from Canada and post things in metric so sometimes I have to ask Siri to convert that into American English-LOL
LOL means laugh out loud???

 

[Ragman]

Drive into the Ford Quick lane at your dealer and have the 12v tested. Ford tweaked something three of our trucks had previously died due to 12v drains now no issues for 6+ months.

That said took one in for sensor recall last month and explicitly asked them to test the 12v and it failed - replaced under warranty. Personally think it took too much abuse in 1st year while it now worked it was done.

 

[Rollin]

I have a 2024 Lariat I have been noticing this problem of no proximity lights in the morning when going to work. where do you swish “accessory mode“ on and off?

 

[GoodSam]

My understanding is that lead acid batteries should be kept at a full charge; and until Ford did the defective BMS, Battery Monitoring Sensor replacement (CSP 23B70) on the Negative post (of the BMS, Battery Management System!), many batteries were subject to long periods left undercharged. Also see this BMS/BMS explanation for PowerBoost trucks posted previously by @TaxmanHog
https://www.f150gen14.com/forum/attachments/bms-operation-pdf.71508/

 

[PJnc284]

My understanding is that lead acid batteries should be kept at a full charge; and until Ford did the defective BMS, Battery Monitoring Sensor replacement (CSP 23B70) on the Negative post (of the BMS, Battery Management System!), many batteries were subject to long periods left undercharged. Also see this BMS/BMS explanation for PowerBoost trucks posted previously by @TaxmanHog
https://www.f150gen14.com/forum/attachments/bms-operation-pdf.71508/

I've had the sensor replacement and the battery still drops to 60ish percent after a few days not charging. The 12v in these things are practically useless

 

[GoodSam]

battery still drops to 60ish percent after a few days

Maybe another bad battery monitoring sensor, not communicating to the battery management system?

 

[davehu]

just got this message today. don't get it. The truck was home and hadn't been driven for a few days but I made three trips to the airport (150 miles rt) several time in the past few weeks. If the dang 12v battery is so finnicky why don't e have some indication of it's capacity?

 

[davehu]

just got this message today. don't get it. The truck was home and hadn't been driven for a few days but I made three trips to the airport (150 miles rt) several time in the past few weeks. If the dang 12v battery is so finnicky why don't e have some indication of it's capacity?

The OP was in March of this year and despite 15 responses, I don't see any real explanation of what is happening and why. My post was over a month ago and it's happened twice since then including today. Truck was parked at home and had plugged in for two days. I "start" the truck and up pops up this message:

now, it's still on the screen as I'm backing out the carport. it goes away after 10 seconds or so. My My Lariat is a 23 with 20k miles. videos on line indicate this is a problem with other Ford ICE vehicles as well. I'm pretty sure my BMS was updated sometime last year. So is this just a bug that goes away or do I need to take my truck in for service?

 

[bmwhitetx]

The OP was in March of this year and despite 15 responses, I don't see any real explanation of what is happening and why. My post was over a month ago and it's happened twice since then including today. Truck was parked at home and had plugged in for two days. I "start" the truck and up pops up this message:


now, it's still on the screen as I'm backing out the carport. it goes away after 10 seconds or so. My My Lariat is a 23 with 20k miles. videos on line indicate this is a problem with other Ford ICE vehicles as well. I'm pretty sure my BMS was updated sometime last year. So is this just a bug that goes away or do I need to take my truck in for service?

My thoughts:
- have the dealer do a battery test. Some dealers have QuickLane with no appointment needed, just pull in.
- ensure you haven't plugged anything in that uses the battery with the truck off. I had a BT OBD dongle that I think may have caused me to get that message once. Or it was my phone being nearby constantly waking up the truck.
- you can read the BMS thread and it will tell you the replacement part numbers - you can check to make sure you got the replacement part.

 

[davehu]

My thoughts:
- have the dealer do a battery test. Some dealers have QuickLane with no appointment needed, just pull in.
- ensure you haven't plugged anything in that uses the battery with the truck off. I had a BT OBD dongle that I think may have caused me to get that message once. Or it was my phone being nearby constantly waking up the truck.
- you can read the BMS thread and it will tell you the replacement part numbers - you can check to make sure you got the replacement part.

thanks. I have no accessories at all and and don't use PAK. I have looked for a BMS thread but there is no BMS thread nor anything titled Battery Management System so all I'm finding is a hundred threads where they are mentioned. Way too many to read through them all. Similar search with Google hasn't helped at all as the ICE F-150 uses the BMS too. Can you, or anyone, point me to a thread or post? II'll check with my dealer after Thanksgiving. Thanks again.

 

[bmwhitetx]

I have looked for a BMS thread but there is no BMS thread nor anything titled Battery Management System so all I'm finding is a hundred threads where they are mentioned. Way too many to read through them all. Similar search with Google hasn't helped at all as the ICE F-150 uses the BMS too. Can you, or anyone, point me to a thread or post? II'll check with my dealer after Thanksgiving. Thanks again.

Here is the main thread. The 4th attachment there tells you what to look for. Bad part numbers end with AC or AD. The CSP ended this past January.

Example bad one:

 

[davehu]

Here is the main thread. The 4th attachment there tells you what to look for. Bad part numbers end with AC or AD. The CSP ended this past January.

Example bad one:

THANK YOU!!! I'll check it out

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