How I got out of the Deep Sleep/Battery Saver Mode

[JoeTime]

Alot to go through for a new truck and waiting over a year for... No thank you

I have a loaded '23 Lariat Hybrid that was delivered in late September (after 375 days—far from a record, but not far from being rolled over to a '24). A few weeks later it started going into deep sleep after sitting for as little as a day, and I began researching these battery threads after the FordPass suggestion to drive the truck didn't seem to have much effect on its "hang time." I have a battery load tester, and it proclaimed the 12V battery healthy, at least when it had a full charge. (It said "replace" when I tested it during deep-sleep depletion, but I think that's to be expected.)

Mysteriously, the truck recently seems to have cured itself without any BMS "hokey-pokey" on my part; I haven't driven it for nearly a week, and the truck and FordPass app are behaving normally. (It's performing more like my previous '06 Prius, on which the 12V would deplete after sitting for a week or 10 days unless the "Smart Key" function—and its current drain—were disabled with a button for that purpose.)

I've also noticed that the truck's frequent relay clacking (with or without a proximate key fob) mentioned elsewhere has also ceased. I can't help thinking this and deep sleep are related; to me the relay activity is indicative of some "vampire" loads that were draining the 12V battery and inducing deep sleep.

BTW, I just did another load test. After six idle days the battery is still reading 12.07V and is showing a decent capacity of 497 CA (I think a full charge should yield 587.5 CA, from the best specs I can find for a Motorcraft replacement):

https://www.oreillyauto.com/shop/b/...a/160530/automotive-truck-2023-ford-maverick?

Has anyone else experienced such a turnabout with the hybrid, and could Ford finally have fixed the problem with an OTA update? Anybody rigged up an inline ammeter or some other means of measuring standby current?

My 23 hybrid has been making clicking sounds anytime day or night since I acquired it Feb. I'll just be walking around the truck and notice it clicking. After about five months the FordPass low battery/no remote features disabled to save battery, warnings started. I took it to the dealer and they said battery is fine...I just have to drive more to keep the battery charged. (just what the app says) I put it on a battery maintainer a couple of times and the FordPass app would work OK. Then after a few days back to the no-work mode. I also did the research and did the BMS reset. It's been five days now, no difference in driving routine and all is well with the app. The reset worked for me. I'll have to listen sometime to hear if it still is making the clicking sound all day.

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[Ran9erboy84]

I got my first deep sleep message last weekend after the truck sat for 4 days. I drove it for a short distance and noticed the interior lights didn't turn on when I opened the door. The next day I put it in sport mode to keep it from going into electric driving when commuting to and from work (only 16 miles one way). Everything worked after that and I didn't get any further deep sleep messages.

 

[MakinDoForNow]

My 23 hybrid has been making clicking sounds anytime day or night since I acquired it Feb. I'll just be walking around the truck and notice it clicking. After about five months the FordPass low battery/no remote features disabled to save battery, warnings started. I took it to the dealer and they said battery is fine...I just have to drive more to keep the battery charged. (just what the app says) I put it on a battery maintainer a couple of times and the FordPass app would work OK. Then after a few days back to the no-work mode. I also did the research and did the BMS reset. It's been five days now, no difference in driving routine and all is well with the app. The reset worked for me. I'll have to listen sometime to hear if it still is making the clicking sound all day.

If you have the fob in your pocket and get within 40ft maybe more from the truck it will click!!! So it's always looking for the fob!!! Had recalls done two days ago and talked to tech, in my driveway since he came to me he said the 0-36 replacement warranty on the bxt99 was no longer printed on the battery label.

 

[Packer Bill]

I think there is a parasitic drain on the battery during the 75 minutes after the Mav is turned off. I had 5 stops (going to work and doing errands). My starting voltage was 12.65 and my ending voltage was 12.25. Yesterday with 2 stops, my voltage started at 12.8 and ended at 12.65.

 

[MakinDoForNow]

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As I was reading the instructions the Hokey Pokey song went thru my head...put your left foot out, pull your left foot in, pull the high beam towards you and turn all about...

Think you got it ... Don't rush the high beam on, high beam off, etc, etc,... Brake pedal push, brake pedal unpush, etc, etc... wait for flash, wait for flash, wait for flash shake your tush... Someone needs to record a utube = " Do the Ford BMS". Maybe put button on display labeled "LETS BMS NOW". Could auto pop up when battery gets low. Hell why not have truck when you are headed home and get a certain distance away (it knows where it is and where it sleeps) it runs HVB up to 72% and when you turn it off it delays disconnecting DCDC converter until 12v is 100% charged or HVB drops to 35-40% SOC. ( I been thinking of installing a maintainer powered by it's own LiFePO4 that recharges while truck is in ready status and maintains 12v while truck is off, being too lazy to plug it in).

 

[JoeTime]

If you have the fob in your pocket and get within 40ft maybe more from the truck it will click!!! So it's always looking for the fob!!! Had recalls done two days ago and talked to tech, in my driveway since he came to me he said the 0-36 replacement warranty on the bxt99 was no longer printed on the battery label.

So the battery is the biggest culprit I assume. I don't have the remote start fob.

 

[Packer Bill]

So the battery is the biggest culprit I assume. I don't have the remote start fob.

Not necessarily...some of us think there is also a parasitic drain on the battery. There is a 75 minute window after the Mav is turned off that something is draining the battery. The more stops you do (turning off the engine) during the day, greater the drain on the battery.

 

[23grayXLT84]

Ford should do a reflash to allow HVB to recharge 12v.

I typically see about at most 0.1v loss per 24 hours.

I recently has the air leak detected TSB applied (no codes / check engine light) while at dealer because they said "might as well since your vin falls". Most likely no effect on anything 12v related but we will see.

 

[BradnChristine]

I keep waiting for Ford to produce some manual or white paper regarding exactly how the battery and charging of the 12V battery works.

There is ZERO consistency on what circumstances make mine go into deep sleep. I can get a Deep sleep message just 15 minutes after a long drive, or 3 days after sitting, or no message even 7 days after sitting.
I see the interior lights fail to come on, but the truck has always started. No sense to me, but my worry is gone with a jump box under the rear seat, just in case.

 

[MakinDoForNow]

I think there is a parasitic drain on the battery during the 75 minutes after the Mav is turned off. I had 5 stops (going to work and doing errands). My starting voltage was 12.65 and my ending voltage was 12.25. Yesterday with 2 stops, my voltage started at 12.8 and ended at 12.65.

If you have something plugged into one of the power points or even on the bus that has the delay active. It will stay in for whichever time delay you have selected (up to 90 minutes, if I remember correctly) OR UNTIL 12V battery drops to 12.1 v, I believe)

So the battery is the biggest culprit I assume. I don't have the remote start fob.

The biggest culprit is the large draw downs on the battery. To help some press the lock button on fob twice as this turns a few things off earlier. I read it as telling truck I will be gone for awhile. I suspect the BMS is optimized to help mpg but it also may be programmed to limit rate of charging due to heat build up. It is after all a vented battery in the hybrid. Odessey has a sealed battery with a steel case that prevents the internal gas pressure from distorting the plastic case which will ruin the plates. It can be charged up to 174°F instead of around 125°F for a battery with a plastic case. Of interest is that even with a design life of 10-12 years their dual high CCA & CRA battery has no warranty if installed in a vehicle with fuel injection or a computer which operates after turn off. Also if battery ever sees 10.5volts without being put on charger to 100% warranty can be denied due to abuse. This is all just a way out of a warranty claim but is indicative of what can be expected on all newer vehicles. Ford will improve the BMS and battery at some point. I will purchase replacements from dealer and keep all records just in case needed for a settlement. If my battery cost is no more than $15-$18/month I can consider that similar to oil changes.

 

[MakinDoForNow]

I keep waiting for Ford to produce some manual or white paper regarding exactly how the battery and charging of the 12V battery works.

There is ZERO consistency on what circumstances make mine go into deep sleep. I can get a Deep sleep message just 15 minutes after a long drive, or 3 days after sitting, or no message even 7 days after sitting.
I see the interior lights fail to come on, but the truck has always started. No sense to me, but my worry is gone with a jump box under the rear seat, just in case.

Idea... If you have an apple watch or temp sensor which can record or send to phone app place it next to battery. Test to see possibility of bms waiting for battery needing to cool down???? It's in the cabin but it's in a rather confined area and someone posted a year or so ago that the hybrid battery compartment was unusually warm ??? Why???

 

[BradnChristine]

Idea... If you have an apple watch or temp sensor which can record or send to phone app place it next to battery. Test to see possibility of bms waiting for battery needing to cool down???? It's in the cabin but it's in a rather confined area and someone posted a year or so ago that the hybrid battery compartment was unusually warm ??? Why???

No Apple anything here!
I just monitor it and wish I understood it...but it is a curiousity, not a problem for me. I'm sure I'd feel different if it ever failed to start, but it seems to me that the HV battery really acts a lot like a jump box when I press the button, solving any low 12V battery issue.

My 2020 Transit RV goes into deep sleep at 14 days, or sooner when I forget to put the trickle charger on it to keep it above the voltage floor. But even with the trickle charger, 14 days of not being started equals deep sleep notice. THAT process I understand...the Maverick, not so much. I do try to always remember to lock it by touching the door button (never the FOB), but when I am anywhere in the house, I am still about 25 feet from the truck with my fob.

 

[jlcinga]

As I was reading the instructions the Hokey Pokey song went thru my head...put your left foot out, pull your left foot in, pull the high beam towards you and turn all about...

Stand on one leg and make a noise like a chicken!

 

[MakinDoForNow]

No Apple anything here!
I just monitor it and wish I understood it...but it is a curiousity, not a problem for me. I'm sure I'd feel different if it ever failed to start, but it seems to me that the HV battery really acts a lot like a jump box when I press the button, solving any low 12V battery issue.

My 2020 Transit RV goes into deep sleep at 14 days, or sooner when I forget to put the trickle charger on it to keep it above the voltage floor. But even with the trickle charger, 14 days of not being started equals deep sleep notice. THAT process I understand...the Maverick, not so much. I do try to always remember to lock it by touching the door button (never the FOB), but when I am anywhere in the house, I am still about 25 feet from the truck with my fob.

It wouldn't hurt to put the fob in a faraday cage with it that close. May not matter one bit but when I approach either my lariat or my xlt lux with their respective fob they start clicking and in the XLT I think I can hear a pump running (maybe to check temp of battery coolant?? I have to be within 8 feet to hear it but it may start running with fob further away. I suspect the basic problem is the same with maverick and the Transit with different battery sizes and age, or? My doors will lock-unlock 200 feet or more away but I hope proximity is not that far though they could be conversing and clicking until they get closer together. I'm with you on regular maintainer use plus jump box availability.

 

[Criss944]

I went about 13 months before I got my first deep sleep message. Now if I let my Maverick sit over 5 days I get the message. I have let the truck sit for another 2 days before driving it and it has never failed to start. I have even used the key fob to start when it in deep sleep.

I have done the "Hokey Pokey" with and without steps 4 and 5 but, the battery light never flashes. What am I doing wrong? If the BMS doesn't need to be rest, will the battery light flash.

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