Battery in Power Save mode

[Terry Tonka]

Grapevine Ford is the worst service I have ever seen. They never return calls either.

Time for another dealership.
[/QUOTE]
You are correct. I've been waiting for them to replace washer fluid reservoir since September. They will never call back. I have to chase them all of the time. Last time they kept my Bronco for 1 week while I had to rent a car. I called them after a week and they told me they were on back order. So they knew but didn't let me know until I called them. It's been 3 months and I called the parts dept and ordered it. they said they will have it on 12-26-24 and of course they haven't called me yet.
They kept my Bronco over 3 weeks to replace my alternator. While I rented a car and made payments and insurance on mine while in the shop doing nothing.

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[Terry Tonka]

Also mine was in battery save mode for 3 weeks and then it started working fine.

 

[Bruinsfan]

Did you try resetting the battery sensor?

https://www.fordservicecontent.com/...A&div=f&vFilteringEnabled=False&buildtype=web

Success, thanks for the info brother. I have attached a screenshot of the straight forward steps.

 

[Ducati1098]

Success, thanks for the info brother. I have attached a screenshot of the straight forward steps.

This isn't going to fix anything. You're only supposed to do this when the battery has been replaced. Any old battery will now be incorrectly charged by the BMS because it thinks it's new.
This is basically just covering up a current issue lol

 

[Bruinsfan]

This isn't going to fix anything. You're only supposed to do this when the battery has been replaced. Any old battery will now be incorrectly charged by the BMS because it thinks it's new.
This is basically just covering up a current issue lol
[/QUOTE
Thanks for weighing in. I had no issues before bringing in my 22 Bronco (30k miles) into the dealership for a windshield replacement. When I picked up my vehicle from the dealership, I started to receive the message. The service tech told me that they put the vehicle in power save mode and the message will go away after a certain number of restarts or miles. I got impatient for the system to update. If I recently developed a problem, it will come back in no time. From there back to the dealership to chase gremlins.

 

[P52Ranch]

I’ve got a couple of questions regarding the battery management. I only received the low battery alert once a few months ago. It came when I hadn’t driven the Bronco for a month. I put it on a trickle charger and then I drove it on several long trips.
Ever since I got that message about the low battery, ASS has not engaged.
I recently got my Bronco serviced at my dealer and asked them to check the battery because the ASS hadn’t triggered even after I had just returned from a 500 mile trip. They said the battery was 100%.
questions:
1. Does that one time low battery error get stored and prevent ASS from activating? If so then I’ll stop complaining about the battery.
2. Do AGM batteries require a different trickle charger?
3. Is there a potential problem in the battery management system because of the one time error not properly charging the battery?

 

[Ducati1098]

I’ve got a couple of questions regarding the battery management. I only received the low battery alert once a few months ago. It came when I hadn’t driven the Bronco for a month. I put it on a trickle charger and then I drove it on several long trips.
Ever since I got that message about the low battery, ASS has not engaged.
I recently got my Bronco serviced at my dealer and asked them to check the battery because the ASS hadn’t triggered even after I had just returned from a 500 mile trip. They said the battery was 100%.
questions:
1. Does that one time low battery error get stored and prevent ASS from activating? If so then I’ll stop complaining about the battery.
2. Do AGM batteries require a different trickle charger?
3. Is there a potential problem in the battery management system because of the one time error not properly charging the battery?

Auto start stop can be inactive for a ton of different reasons. I'm pretty sure there is a section of the instrument cluster that will tell you why it isn't currently using auto start stop (unless I'm thinking of a different model). Having a previous battery warning doesn't necessarily mean that's the cause.

1. No
2. Trickle charging an AGM battery with a normal charger likely wont hurt it depending on what type of charger/charge it was on, but AGM batteries do require a specific type of charger so they aren't damaged.
3. Probably not because it would likely set some type of DTC

It still could be a battery issue, and personally I would have it double checked at a different location. Them saying it was "100%" seems suspicious as it likely isn't.

 

[Brian_B]

For charging it just like over a day or a few hours - you can use a standard charger, it won't hurt anything.

If you want to leave it on overnight, or as a maintainer for a long period of time - you should get one rated for AGM.

The BMS system counts amps in and out of the battery as part of it's Battery Health. If you don't hook the charger up correctly, it can't see the amps going back into the battery and still thinks the battery is poor health, even if the voltage looks fine. Total amps in/out go into battery age, which is another part of that calculation -- and why you don't want to just reset the BMS on an older battery with the BMS reset procedure. Temperature is another part, so if it's really hot or cold, it will charge the battery differently (and affect ASS too)

Default BMS aims to hold the battery at 80% charge (there is a setting in Forscan for that)

 

[ABorges]

Why is my Bronco in power save mode. It doesn't tell me what is wrong, and voltage is at a constant 14.7 - 14.9.
I have searched the forums and can't find anything on it. Screens black out when I get in.. Starts and runs fine since it started doing this yesterday.
I just don't wan't to get stranded for the 3rd time with this junk heap again. The other times were because the alternator when out and then when they installed the new one and the charging cable was never tightened down by Grapevine Ford. and left me stranded again. They have no answers either and just said bring it in.
They took 3 weeks to replace the alternator. They had it a week to replace the washer fluid reservoir that they never got done. After a week I just picked it up and still leaks like a fishing net. They were going to call me when it came in. It's been 3 months and nothing. they will never call back
Grapevine Ford is the worst service I have ever seen. They never return calls either.

Did you get the battery checked yet? I was getting the same alert. I had my battery checked, and it showed that it needed to be charged. The alert hasn't come back.

 

[dgorsett]

I’ve got a couple of questions regarding the battery management. I only received the low battery alert once a few months ago. It came when I hadn’t driven the Bronco for a month. I put it on a trickle charger and then I drove it on several long trips.
Ever since I got that message about the low battery, ASS has not engaged.
I recently got my Bronco serviced at my dealer and asked them to check the battery because the ASS hadn’t triggered even after I had just returned from a 500 mile trip. They said the battery was 100%.
questions:
1. Does that one time low battery error get stored and prevent ASS from activating? If so then I’ll stop complaining about the battery.
2. Do AGM batteries require a different trickle charger?
3. Is there a potential problem in the battery management system because of the one time error not properly charging the battery?

Kinda the same for me. I got the low battery alert in Ford Pass after just a few days not driven. Many short drives before that though. Hooked up my AGM rated charger, showed 38%, charged for about 5 hours to 100%. I driven mixed trips since then and all good, but no ASS and running voltage is always high 14s or low 15. So I like your #1 and 3 theories. Maybe it keeps the low battery defaults until it is reset at battery replacement?

 

[Squirrel13]

With all the modules and other parasitic draw these newer vehicles have proper charging is crucial to system stability and longevity. Neither my 20 F350 or my 24 Bronco are driven daily so they sit for days at a time. I wired both of them with NOCO plugs and each gets a NOCO Genius 10. Its important when charging that the incoming NEG current is DOWNSTREAM of the NEG terminal battery sensor or the BMS won't register any change to battery_state_of_charge.

Brian - FordTechMakuloco has an awesome video covering this Ford BMS Battery Monitoring

<iframe width="560" height="315" src="" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

 

[airforceteacher]

Has anyone yet tried a lithium battery? I'm WFH, so there are weeks my Bronco doesn't even get started, or only make a mile or two drive a day, so I occasionally get the low power mode and all cellular based Fordpass activities are paused.

This site has a Bronco as the banner image for their car batteries: https://dakotalithium.com/lithium-a...D3H14thrYShPuKCt51TpUe4hKWpJy-s7d6l_s0eO0fW73

I'm not dumb enough to assume they've tested just because of their picture though. I have used lithium batteries in my motorcycle for years though, and love them. It sometimes goes months without riding, and usually holds enough charge to start, and even if it doesn't, a quick charge gets it healthy quickly.

 

[Squirrel13]

My 24 wildtrak sits on a tender as I mod it. The tender is hooked downstream of the BMS, battery is like 12.7-13v. I think this low power mode is triggered by a countdown clock. If vehicle isn’t driven and completes a closed loop it triggers this.

 

[Brian_B]

Has anyone yet tried a lithium battery? I'm WFH, so there are weeks my Bronco doesn't even get started, or only make a mile or two drive a day, so I occasionally get the low power mode and all cellular based Fordpass activities are paused.

This site has a Bronco as the banner image for their car batteries: https://dakotalithium.com/lithium-a...D3H14thrYShPuKCt51TpUe4hKWpJy-s7d6l_s0eO0fW73

I'm not dumb enough to assume they've tested just because of their picture though. I have used lithium batteries in my motorcycle for years though, and love them. It sometimes goes months without riding, and usually holds enough charge to start, and even if it doesn't, a quick charge gets it healthy quickly.

Gotta admit I've been curious if anyone has tried this too. A bit rich for me to just buy it to try it, but if it does work as it should - the price should more or less come out about right versus what longevity you ~should~ get out of it.

https://antigravitybatteries.com/products/starter-batteries/automotive/ag-h7-rs/

 

[GoHawks63]

With all the modules and other parasitic draw these newer vehicles have proper charging is crucial to system stability and longevity. Neither my 20 F350 or my 24 Bronco are driven daily so they sit for days at a time. I wired both of them with NOCO plugs and each gets a NOCO Genius 10. Its important when charging that the incoming NEG current is DOWNSTREAM of the NEG terminal battery sensor or the BMS won't register any change to battery_state_of_charge.

Brian - FordTechMakuloco has an awesome video covering this Ford BMS Battery Monitoring

<iframe width="560" height="315" src="" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

This was very informative. Thanks for sharing.

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