Deep Sleep FIX - Maverick Hybrid 12V battery - One Year Update

[mav47]

I'm going to have to reluctantly disagree here. Due to this charging system and my 80 year old retired driving style, I've managed to sulfate both my OEM and subsequent AGM batteries. Latest episode was when I had recharged my UPlus AGM and was heading on a 20 mile drive to Hines VA hospital. I happened to look down at my voltmeter plugged into the cig receptacle. It read 12.8v and not the normal 15.0v! It dawned on me then that the battery was not accepting a charge from the DC/DC converter. It was reading 12.5v by the time I got home. Right now I have the OEM battery back installed after desulfating it. I ran my charger, with the repair mode, all night long on the AGM battery and it now reads 13.5v this morning. I ordered another AGM battery, this time a WEIZE H5, with more reserve capacity. I know it'll take a bit of modification. So be it.

@glohworm

I'll refer to my original writeup from one year ago on this issue. It is linked in the first post on this thread here.

Your Uplus AGM battery is almost certainly perfectly fine.

What you are witnessing (voltage dropping to 12.8-ish Volt while driving is NORMAL. Nothing is wrong.

Ford's Battery Management System (BMS) will keep the system charging until it feels the battery has reached its 80% State of Charge (SOC) setpoint, and then DC-DC converter output will drop to around 13V. This is done simply to save fuel.

If you read my original writeup it explains why the OEM flooded battery shows 15-15.3V at all times, and why with the AGM battery the BMS will actually do what it is supposed to: switch between around 15V when charging and 13V when not charging.

I concluded it has to do with a lower internal resistance of the AGM battery, while the higher resistance causes the flooded battery never to reach the trigger setpoint for the BMS to shut off.

Your voltmeter in the dash shows 12.8V while mine shows 13.0V, which likely has to do with the cheapness of these things. Your truck does exactly the same thing as mine with that same Uplus AGM installed.

I would stick that Uplus AGM back in, reset the BMS since you've charged it on the workbench, and be on your merry way!

I think you'll find things working fine going forward. Maybe even unplug that voltmeter, like I did after I gained confidence in the new AGM in this truck a long time ago now.

Cheers!

Sponsored

 

[4sambos]

@glohworm

I'll refer to my original writeup from one year ago on this issue. It is linked in the first post on this thread here.

Your Uplus AGM battery is almost certainly perfectly fine.

What you are witnessing (voltage dropping to 12.8-ish Volt while driving is NORMAL. Nothing is wrong.

Ford's Battery Management System (BMS) will keep the system charging until it feels the battery has reached its 80% State of Charge (SOC) setpoint, and then DC-DC converter output will drop to around 13V. This is done simply to save fuel.

If you read my original writeup it explains why the OEM flooded battery shows 15-15.3V at all times, and why with the AGM battery the BMS will actually do what it is supposed to: switch between around 15V when charging and 13V when not charging.

I concluded it has to do with a lower internal resistance of the AGM battery, while the higher resistance causes the flooded battery never to reach the trigger setpoint for the BMS to shut off.

Your voltmeter in the dash shows 12.8V while mine shows 13.0V, which likely has to do with the cheapness of these things. Your truck does exactly the same thing as mine with that same Uplus AGM installed.

I would stick that Uplus AGM back in, reset the BMS since you've charged it on the workbench, and be on your merry way!

I think you'll find things working fine going forward. Maybe even unplug that voltmeter, like I did after I gained confidence in the new AGM in this truck a long time ago now.

Cheers!

Plus after resetting BMS, I would remove any diagnostic information going to Ford.
I did all this and my truck hadn’t gone into Deep Sleep since 9+ days.

 

[glohworm]

@glohworm

I'll refer to my original writeup from one year ago on this issue. It is linked in the first post on this thread here.

Your Uplus AGM battery is almost certainly perfectly fine.

What you are witnessing (voltage dropping to 12.8-ish Volt while driving is NORMAL. Nothing is wrong.

Ford's Battery Management System (BMS) will keep the system charging until it feels the battery has reached its 80% State of Charge (SOC) setpoint, and then DC-DC converter output will drop to around 13V. This is done simply to save fuel.

If you read my original writeup it explains why the OEM flooded battery shows 15-15.3V at all times, and why with the AGM battery the BMS will actually do what it is supposed to: switch between around 15V when charging and 13V when not charging.

I concluded it has to do with a lower internal resistance of the AGM battery, while the higher resistance causes the flooded battery never to reach the trigger setpoint for the BMS to shut off.

Your voltmeter in the dash shows 12.8V while mine shows 13.0V, which likely has to do with the cheapness of these things. Your truck does exactly the same thing as mine with that same Uplus AGM installed.

I would stick that Uplus AGM back in, reset the BMS since you've charged it on the workbench, and be on your merry way!

I think you'll find things working fine going forward. Maybe even unplug that voltmeter, like I did after I gained confidence in the new AGM in this truck a long time ago now.

Cheers!

Mav47, I appreciate your input on this, but I think you're wrong in my case. That voltmeter was reading 12.8, then 12.7, and so on, until I arrived back home, at which time it read 12.5v. I'm certain, had I continued driving the truck, it would have shut down on me. That voltmeter saved me a ton of heartache!

 

[mav47]

Mav47, I appreciate your input on this, but I think you're wrong in my case. That voltmeter was reading 12.8, then 12.7, and so on, until I arrived back home, at which time it read 12.5v. I'm certain, had I continued driving the truck, it would have shut down on me. That voltmeter saved me a ton of heartache!

@glohworm

That's interesting. I've been trying to come up with a reason why you saw this behavior, and so far I cannot come up with any. And I understand this system pretty well by now.

A bad AGM battery, which I still don't think you're dealing with here, would not make that really powerful DC-DC converter output voltage drop down to 12.5V while running

One possibility: there is that battery eyelet disconnect issue on early Maverick Hybrids (described earlier in this thread), which literally disconnects the battery from the onboard DC system. But that typically does not cause a systemwide voltage drop as far as I know, but maybe I am mistaken here. Note that the DC-DC converter is feeding the vehicle, including your voltmeter, and then through that eyelet (that could be loose) it feeds your battery.

Just thinking out loud!

Hope you find what's wrong, and will report back. I'm curious now.

Cheers!

 

[CurtisB]

I have pasted my 3 year warranty with my Hibrid Maverick, and still have the battery it came with. I just live with the deep sleep notices, and pay no attention to them. I only drive 3500 miles a year, (I'm 84, and retired) and my truck sits days undriven. It has never failed to start, and the lights inside turn on as soon as I hit the push to start button. I will replace the battery with a AMG one when the time comes.

Keep on kickin it sir! Appreciate your post!

 

[Hankster]

Just to get this information on the thread...

RESETTING THE BATTERY SENSOR
When you install a new battery, reset the battery sensor by doing the following:
1. Switch the ignition on, and leave the engine off.
Note: Complete Steps 2 and 3 within 10 seconds.
2. Flash the high beam headlamps five times, ending with the high beams off.
3. Press and release the brake pedal three times.
The battery warning lamp flashes three times to confirm that the reset is successful.

How would you do this on my '25 Lariat Hybrid? Do you put it just in accessory mode?

 

[raymaines]

How would you do this on my '25 Lariat Hybrid? Do you put it just in accessory mode?

With the key in your pocket and both feet on the floor, push the start button.

 

[Gvmumbral]

One year ago I got tired of the seemingly random deep sleep messages from my 2022 Maverick Hybrid Lariat, interior lights not working, etc.. I played a bit with the State of Charge (SOC) setting in Forscan (which is the only thing you can tweak), but that didn't seem to make any difference. I'd get deep sleep reports (indicating a low battery voltage) sometimes right after my 40 mile commute.

Upon reading reports on this forum, and since I have a professional background in vehicle electrical systems, I concluded that a 12V AGM battery could be the solution, I figured out that the Group 140R battery type is a drop in for the Maverick Hybrid, and I purchased and installed that UPlus Group 140R AGM battery which I think was $135 on Amazon in March 2024.

Here's a my original writeup about it: https://www.mavericktruckclub.com/f...ms-a-bit-high-while-driving.43755/post-771567

Besides the AGM install there's one more thing: I had raised the SOC setting in Forscan to 100% while trying to see if that would improve this issue well before that AGM install, and I simply left it there with the new AGM.

And after one of the taillight recalls was performed on the truck (which overwrites the BCM module with an updated version and reverts SOC back to 80%) I then raised it again to 100% (and again turned off double honk, turned on DRL taillights, etc. etc.). My reasoning: AGMs like to be charged to 100% regularly.

No other tweaks were done: Fordpass is connected and works fine, no trickle chargers were ever used. I just used the truck throughout the year.

ONE YEAR UPDATE:

I put about 25k miles on the truck since installing that AGM battery 12 months ago.

Essentially I have had ZERO (!!) deep sleep messages since then. The interior lights always work when entering, everything simply works as expected. Every day throughout summer and winter.

There was ONE deep sleep event that occurred about 11 months ago in April 2024, when we were on a family vacation abroad and the truck was parked for close to 3 weeks. After 16 days I got a message in Fordpass that the truck had entered deep sleep, which is exactly what this deep sleep feature is designed for as it prevents onboard systems from draining the battery so far that it might not start. This is normal.

It appears there are still many owners struggling with this 12V battery/deep sleep issue on their 2022-2024 Hybrids: so many messages on this forum are talking about investigating battery drain, connecting trickle chargers, owners are told to drive longer distances (?), people are pulling fuse 11, so disconnecting Fordpass connectivity, various battery replacements (with OEM flooded ones again!) most don't end up solving the issue. Overall: lots of hassles. I read of owners that actually SOLD their Maverick Hybrid because of this, and there are people that won't buy a Hybrid because of this problem.

At this point, based on my experience, I'd say that many might be overthinking this.


For me, the fix proved to be:

1) Install a Group 140R AGM battery

2) Raise SOC setting in Forscan to 100%



Cheers!

Ok, i just installed the AGM Battery recommended in this post. Didn't do the Forscan 100% thing, but did reset the BMS. Hopefully I don't get any more Deep Sleep messages. Fingers crossed!

 

[NedF]

I stopped by an Auto Parts store close to home with the intent of buying a Group 140R AGM battery, but they would have to order it from the warehouse (same or next day). He pointed out the computer showed the truck took a Group 99R battery, so I thought I better double check before I ordered one.

I know most of you are buying the one from Amazon, but unfortunately north of the 49th its not available. I found a Group 140R (H4) AGM (ACDelco) for a decent price after considering our exchange rate it's about $192 USD. I see that the W and L are identical to the OEM 99R just the height is a little over 5mm taller (just under a 1/4"), so I don't see this as a problem, but the post is an "A" whereas the post on the 99R has an "A1". They look very similar but has anyone had any issues due to the connection to the battery post after switching?

 

[Builder]

I stopped by an Auto Parts store close to home with the intent of buying a Group 140R AGM battery, but they would have to order it from the warehouse (same or next day). He pointed out the computer showed the truck took a Group 99R battery, so I thought I better double check before I ordered one.

I know most of you are buying the one from Amazon, but unfortunately north of the 49th its not available. I found a Group 140R (H4) AGM (ACDelco) for a decent price after considering our exchange rate it's about $192 USD. I see that the W and L are identical to the OEM 99R just the height is a little over 5mm taller (just under a 1/4"), so I don't see this as a problem, but the post is an "A" whereas the post on the 99R has an "A1". They look very similar but has anyone had any issues due to the connection to the battery post after switching?

I installed the AC Delco LN1 (H4) AGM with no problems. It’s a drop in fit and a real champ particularly during the cold season. Even took my time on the install and it still only took about 20 minutes. It will fit just fine.

 

[NedF]

I installed the AC Delco LN1 (H4) AGM with no problems. It’s a drop in fit and a real champ particularly during the cold season. Even took my time on the install and it still only took about 20 minutes. It will fit just fine.

Perfect... I ordered it. I have given up waiting for Ford to give us the fix. My original battery is sitting at or below 12V each morning now and often at close to 0% SOC.

 

[NedF]

Well, I got the ACDelco LN1AGM charged up, installed and BMS reset.

Deep Sleep is gone, so after about 6 months of instant deep sleep after shutting it off, I can now use the Ford App again. I forgot to test the passenger side keyless entry before I parked it back against my storage racks as it had stopped working and I read this can be because of deep sleep.

I am putting the original OEM battery through a reconditioning to see if it can be salvaged. My only plan is to pop it back in if they ever get to the battery recall they said was coming this quarter (not 100% sure but today - or this week - might be the end of their quarter). Maybe I can get a new battery as a backup.

If you are wondering what is in the bag to the left of the charger it's a small Ziplock bag of dog treats that were in my packet (It's not pot or dog poop - I know it looks like it could be either). LOL

 

[GreyCacti]

One year ago I got tired of the seemingly random deep sleep messages from my 2022 Maverick Hybrid Lariat, interior lights not working, etc.. I played a bit with the State of Charge (SOC) setting in Forscan (which is the only thing you can tweak), but that didn't seem to make any difference. I'd get deep sleep reports (indicating a low battery voltage) sometimes right after my 40 mile commute.

Upon reading reports on this forum, and since I have a professional background in vehicle electrical systems, I concluded that a 12V AGM battery could be the solution, I figured out that the Group 140R battery type is a drop in for the Maverick Hybrid, and I purchased and installed that UPlus Group 140R AGM battery which I think was $135 on Amazon in March 2024.

Here's a my original writeup about it: https://www.mavericktruckclub.com/f...ms-a-bit-high-while-driving.43755/post-771567

Besides the AGM install there's one more thing: I had raised the SOC setting in Forscan to 100% while trying to see if that would improve this issue well before that AGM install, and I simply left it there with the new AGM.

And after one of the taillight recalls was performed on the truck (which overwrites the BCM module with an updated version and reverts SOC back to 80%) I then raised it again to 100% (and again turned off double honk, turned on DRL taillights, etc. etc.). My reasoning: AGMs like to be charged to 100% regularly.

No other tweaks were done: Fordpass is connected and works fine, no trickle chargers were ever used. I just used the truck throughout the year.

ONE YEAR UPDATE:

I put about 25k miles on the truck since installing that AGM battery 12 months ago.

Essentially I have had ZERO (!!) deep sleep messages since then. The interior lights always work when entering, everything simply works as expected. Every day throughout summer and winter.

There was ONE deep sleep event that occurred about 11 months ago in April 2024, when we were on a family vacation abroad and the truck was parked for close to 3 weeks. After 16 days I got a message in Fordpass that the truck had entered deep sleep, which is exactly what this deep sleep feature is designed for as it prevents onboard systems from draining the battery so far that it might not start. This is normal.

It appears there are still many owners struggling with this 12V battery/deep sleep issue on their 2022-2024 Hybrids: so many messages on this forum are talking about investigating battery drain, connecting trickle chargers, owners are told to drive longer distances (?), people are pulling fuse 11, so disconnecting Fordpass connectivity, various battery replacements (with OEM flooded ones again!) most don't end up solving the issue. Overall: lots of hassles. I read of owners that actually SOLD their Maverick Hybrid because of this, and there are people that won't buy a Hybrid because of this problem.

At this point, based on my experience, I'd say that many might be overthinking this.


For me, the fix proved to be:

1) Install a Group 140R AGM battery

2) Raise SOC setting in Forscan to 100%



Cheers!

What is the double honk? Mine just did it couple hours ago when I got home. It's so random

 

[NedF]

What is the double honk? Mine just did it couple hours ago when I got home. It's so random

Without searching the manual… mine will do this if I leave it “Ready” or in ACC and get out and shut the door with the keys on me. It’s annoying especially when your doing it on purpose!

 

[Gullzway]

Well, I got the ACDelco LN1AGM charged up, installed and BMS reset.

Deep Sleep is gone, so after about 6 months of instant deep sleep after shutting it off, I can now use the Ford App again. I forgot to test the passenger side keyless entry before I parked it back against my storage racks as it had stopped working and I read this can be because of deep sleep.

I am putting the original OEM battery through a reconditioning to see if it can be salvaged. My only plan is to pop it back in if they ever get to the battery recall they said was coming this quarter (not 100% sure but today - or this week - might be the end of their quarter). Maybe I can get a new battery as a backup.

If you are wondering what is in the bag to the left of the charger it's a small Ziplock bag of dog treats that were in my packet (It's not pot or dog poop - I know it looks like it could be either). LOL

Give it a year.
I'm on my 2nd Battery, both started giving Deep Sleep messages at around 11 months.

Unless they actually come up with a fix that was supposed to be this quarter.

Sponsored