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

[4sambos]

No worries, that H4/Group 140R AGM fits just fine.

Remember that Ford specifies the Group 99R flooded battery for the 22-24 Maverick Hybrid, so that's what Amazon thinks is the only correct one.

Simply installing this H4 /Group 140R AGM should get rid of the majority of your deep sleep / low battery warnings (see above @CurtisB ), and if you have access to Forscan, then bumping up the SOC from 80 to 100% should fix it completely, like it did for me.

As per @DadsLariat (and others) you could also install the larger H5 AGM, but now you have to modify a bracket in the battery compartment to make it fit. The H5 has about 20% more reserve capacity (RC) than the H4, which is possibly the reason why even without SOC tweaks in Forscan some owners report the deep sleep problem completely gone with just the H5 battery installed. But that's just an educated guess from my side.

I do feel that bumping SOC to 100% is likely the best solution for ultimate longevity as AGMs like to be charged to 100% regularly. But I might be overthinking this, as we often tend to do: it may prove to be just fine.

Cheers!

Thank you very much for your knowledge in fixing this long standing deep sleep issue that Ford knows of but hasn’t fixed yet?

Sponsored

 

[mav47]

Thank you very much for your knowledge in fixing this long standing deep sleep issue that Ford knows of but hasn’t fixed yet?

Here's what I think the issue is (just thinking out loud):

Ford obviously needs to comply with all applicable regulations: NTSB, EPA, etc.

I would think that they cannot make changes to already US certified vehicles that lower for instance fuel economy.

So, they chose the (weird) 60-80% SOC charging method to help squeeze absolute maximum fuel efficiency out of their vehicles (remember that many modern Fords have these low voltage issues), and then they put a really crappy FLA battery in the Maverick likely for cost reasons.

If they were to change the charging to go back up to 100%, it may affect EPA rating. If that change was absolutely needed, they would then need to make changes elsewhere to offset this, all the while keeping total available power the same. Weight has to stay the same, etc. etc. They may simply not be able to do this legally.

And cost is what probably kept them from putting AGM batteries in there as a fix.

And now they're putting AGMs in 2025 models. But that was by design so they should have proper supplier contracts for these. Automotive supply chains are very complicated and have very long (years long) lead times on most parts. If Ford were to suddenly need fifty thousand AGM batteries any supplier that could actually fill that demand would stick it to them.

Just thinking out loud!

Cheers!

 

[PeteSJCA]

And there we have it folks. I installed an AGM battery in May of last year. I don't have forscan so I didn't get to reset the charging level. I still get sleep messages occasionally but the battery charges back up. Waiting for Ford to come through with the sofware fix. If they don't do it right, I'm driving down to Carlsbad..................LoL. I think I met you at the Maverick meeting in Huntington Beach!

Thanks for your posts! I don't have forscan either. I guess I'm driving down to Carlsbad too. ;-)

 

[CurtisB]

No worries, that H4/Group 140R AGM fits just fine.

Remember that Ford specifies the Group 99R flooded battery for the 22-24 Maverick Hybrid, so that's what Amazon thinks is the only correct one.

Simply installing this H4 /Group 140R AGM should get rid of the majority of your deep sleep / low battery warnings (see above @CurtisB ), and if you have access to Forscan, then bumping up the SOC from 80 to 100% should fix it completely, like it did for me.

As per @DadsLariat (and others) you could also install the larger H5 AGM, but now you have to modify a bracket in the battery compartment to make it fit. The H5 has about 20% more reserve capacity (RC) than the H4, which is possibly the reason why even without SOC tweaks in Forscan some owners report the deep sleep problem completely gone with just the H5 battery installed. But that's just an educated guess from my side.

I do feel that bumping SOC to 100% is likely the best solution for ultimate longevity as AGMs like to be charged to 100% regularly. But I might be overthinking this, as we often tend to do: it may prove to be just fine.

Cheers!

I installed an AGM size 47 H5. It was a little taller and slightly wider, but it fits firmly in place.

 

[ZABSMAV]

Here's what I think the issue is (just thinking out loud):

Ford obviously needs to comply with all applicable regulations: NTSB, EPA, etc.

I would think that they cannot make changes to already US certified vehicles that lower for instance fuel economy.

So, they chose the (weird) 60-80% SOC charging method to help squeeze absolute maximum fuel efficiency out of their vehicles (remember that many modern Fords have these low voltage issues), and then they put a really crappy FLA battery in the Maverick likely for cost reasons.

If they were to change the charging to go back up to 100%, it may affect EPA rating. If that change was absolutely needed, they would then need to make changes elsewhere to offset this, all the while keeping total available power the same. Weight has to stay the same, etc. etc. They may simply not be able to do this legally.

And cost is what probably kept them from putting AGM batteries in there as a fix.

And now they're putting AGMs in 2025 models. But that was by design so they should have proper supplier contracts for these. Automotive supply chains are very complicated and have very long (years long) lead times on most parts. If Ford were to suddenly need fifty thousand AGM batteries any supplier that could actually fill that demand would stick it to them.

Just thinking out loud!

Cheers!

Anything short of a full (as in 100%) recharge of a lead acid battery leads to its sulfation and its untimely early death.

 

[mav47]

I installed an AGM size 47 H5. It was a little taller and slightly wider, but it fits firmly in place.

@CurtisB

My bad, sorry! Somehow I thought you had gone the H4/Group 140R route, even though you never said so.

So with your H5 you still get the occasional deep sleep, while some others report none with an H5.

That may have to do with different use scenarios then?

Anyway, I update my second post above to correct it for future readers.

Apologies again!

Cheers!

 

[rknrbt]

Mav47...I thought I read on here that the Deep Sleep issue was only for 22's and 23's. Do the 24's see it also?

I had this issue on my '22 hybrid and have the same issue on my '24 hybrid Maverick.

 

[ZABSMAV]

I had this issue on my '22 hybrid and have the same issue on my '24 hybrid Maverick.

Which was to be expected since nothing is different in the 2022, 2023 and 2024 recharging circuitry. There are a little more than 13 days left for Ford to announce the fix for this rediculous ongoing problem in the hybrid Mavericks (their promise, not ours).

 

[BrothrFree]

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!

Thank you for doing this analysis and the outstanding report back. I’ve been searching for a solution leaning toward the AGM battery. This is the first mention of the SOC I’ve seen.

 

[CurtisB]

@CurtisB

My bad, sorry! Somehow I thought you had gone the H4/Group 140R route, even though you never said so.

So with your H5 you still get the occasional deep sleep, while some others report none with an H5.

That may have to do with different use scenarios then?

Anyway, I update my second post above to correct it for future readers.

Apologies again!

Cheers!

No problem! I really feel the software update will be the final fix. I can sacrifice 1 mpg for a consistent charge for my 12 volt battery.

 

[23grayXLT84]

Here's what I think the issue is (just thinking out loud):

Ford obviously needs to comply with all applicable regulations: NTSB, EPA, etc.

I would think that they cannot make changes to already US certified vehicles that lower for instance fuel economy.

So, they chose the (weird) 60-80% SOC charging method to help squeeze absolute maximum fuel efficiency out of their vehicles (remember that many modern Fords have these low voltage issues), and then they put a really crappy FLA battery in the Maverick likely for cost reasons.

If they were to change the charging to go back up to 100%, it may affect EPA rating. If that change was absolutely needed, they would then need to make changes elsewhere to offset this, all the while keeping total available power the same. Weight has to stay the same, etc. etc. They may simply not be able to do this legally.

And cost is what probably kept them from putting AGM batteries in there as a fix.

And now they're putting AGMs in 2025 models. But that was by design so they should have proper supplier contracts for these. Automotive supply chains are very complicated and have very long (years long) lead times on most parts. If Ford were to suddenly need fifty thousand AGM batteries any supplier that could actually fill that demand would stick it to them.

Just thinking out loud!

Cheers!

Seeing deep sleep posts on the 25s on other forums. Not much has changed it seems.

 

[HeyBales]

I'll just report that plenty of people have posted they did that Forscan SOC change and then monitored what actually happens with an OBD scanner while they drive.

The SOC still doesn't go above 80%. Usually not close.
The AGM seems to be the stronger factor. Though some reports of early changers on that eventually started having issues again.

Considering there are 5 battery related PIDS, and the other 4 are very obviously not used - I'm betting that SOC% isn't used by the programming either.
I'm sure like the values regarding DEF are still in there, many fields/values were just copied over from other Ford systems but not referenced for anything when it doesn't apply.

What does seem to be used at 80% is the willingness to do the higher Amp charging for awhile, like around 5-6A up to 9-10, until it drops quickly to the 2-4A level, and finally to the 0-1A level.
But frankly even that seems to be at 65% by the truck's own PID for current SOC%.

And ya - deep sleep is a feature.
Just like over 20 years ago when car interior lights would turn off automatically eventually when the driver accidentally left one on, or a door didn't close totally and leave the light on.
How many batteries saved by that feature, allowing a start the next morning.
If you don't want deep sleep - then pull the TCU fuse since that already accomplishes it. You ain't getting remote access either way.

 

[Cherokee]

At a Ford Exec meeting, conversation went like this,

" Well fellas I think our best least costly fix for the poor design of the battery management system leading to it's inability to charge the 12 volt battery often enough and to a higher state of charge is a simple fix."
The board members all perk up and listen.

"We put out a few software up dates as we drag our feet. Then we Insert a few of our employees that are total yes men into the forums pretending to be owners and have them show how an AGM battery AND a reset to charge the AGM to 100% fixes this Issue.

This will keep us from having to replace all the led acid batteries. This will save us Butt Loads of money. That way Bob can still buy that Yacht he want's and I can get a new Lear jet."
"And all you fellas can get your wives a new fur coat and a Rolls Royce." The room erupts into a chuckle,
"Then we can still go to Vegas"
,
The Vote comes back Unanimous, Meeting Is adjourned.
Guy in the back Yells out, "Hey It's happy hour I'm buying !"

 

[Ozarkbeard]

...If you don't want deep sleep - then pull the TCU fuse since that already accomplishes it...

That's all I've done except I also put the truck on a battery maintainer when I won't be driving for a few days. I've used a maintainer on my truck, my lawnmower and on previous vehicles for years, to maintain long-term battery health.

I've never had my truck go in to deep sleep in 1.5 years of Hybrid ownership. Still have the original flooded lead-acid battery.

 

[HeyBales]

At a Ford Exec meeting, conversation went like this,

" Well fellas I think our best least costly fix for the poor design of the battery management system leading to it's inability to charge the 12 volt battery often enough and to a higher state of charge is a simple fix."
The board members all perk up and listen.

"We put out a few software up dates as we drag our feet. Then we Insert a few of our employees that are total yes men into the forums pretending to be owners and have them show how an AGM battery AND a reset to charge the AGM to 100% fixes this Issue.

This will keep us from having to replace all the led acid batteries. This will save us Butt Loads of money. That way Bob can still buy that Yacht he want's and I can get a new Lear jet."
"And all you fellas can get your wives a new fur coat and a Rolls Royce." The room erupts into a chuckle,
"Then the rest of us can still go to Vegas"
,
The Vote comes back Unanimous, Meeting Is adjourned.
Guy in the back Yells out, "Hey It's happy hour I'm buying !"

Hope they put motorcraft batteries in that yacht and learjet!

Sponsored