SSM 53801: 2022-2025 Maverick Hybrid 12V Battery Drain Issue Update Fix Released!

[johnDeere]

Well this is interesting, we have read that the problem with "load dumping" from intermittent unknown load draw is from the AC system, or the ACCM unit, or the HVAC system.
Well I looked on my spread sheet for "as built" , and compared some numbers to the "2023 maverick Livnitup" sheet and found that the HVAC group 733, had more things than just HVAC.
I found a listing for 733-01-04 xxBx-xxxx-xx--..
Well that spot where I have a "B" is for "Battery Management System"
My "as built", sheet shows "B" for that spot, but "B" is not in the listing of settings to pick.
2023 mav. XLT hybrid.

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[Waterick]

Well this is interesting, we have read that the problem with "load dumping" from intermittent unknown load draw is from the AC system, or the ACCM unit, or the HVAC system.
Well I looked on my spread sheet for "as built" , and compared some numbers to the "2023 maverick Livnitup" sheet and found that the HVAC group 733, had more things than just HVAC.
I found a listing for 733-01-04 xxBx-xxxx-xx--..
Well that spot where I have a "B" is for "Battery Management System"
My "as built", sheet shows "B" for that spot, but "B" is not in the listing of settings to pick.
2023 mav. XLT hybrid.

As @Glen Baker LLC might respond. I think the BMS is somehow at the bottom of all these woes.

 

[Glen Baker LLC]

As @Glen Baker LLC might respond. I think the BMS is somehow at the bottom of all these woes.

I don't have readouts or any of that.
All I can respond to is what I did exactly and what the results were.

In July and August of 2024 I had two or three instances of the interior light failing to illuminate.
1. September of 2024 I turned off as much communication and the infotainment system that I could.
I uninstalled Ford pass from my phone. Yes I realize that it's not really uninstalled.
2. I removed fuse 11/12.
3. I hooked up low amp battery charger.
4. I charged the system overnight probably 10 hours. The Charger Light was a steady green. Unplugged charger.
5. I did the battery relearn procedure.

For the last eight months that fuse 11/12 has been removed, I hadn't had a problem.

On the 14th of May I reinstalled fuse 11/12.
On the 16h of May I did a 60 mile round trip drive to return a dog I was caring for.
Saturday the 18th the truck was not used. Sunday the 19th I noticed when I opened the driver's door the light did not illuminate and it's pretty obvious because the truck is in the garage.
The only thing that was changed was fuse 11/12 was reinstalled.
So, less than a week after reinstalling fuse 11/12 interior and exterior lights failed to illuminate when the door is opened.
Update; the amount of clicking I've noticed has increased. In February of this year I bought a new modem router and I never input the new password to the Maverick

Coincidence

My Maverick is a 2023 hybrid XLT lux.

 

[johnDeere]

Hello Glen Baker LLC
I like your test and conclusion.
You may be on to something.
The truck wants to "phone home" and there lies the possible problem.

It looks like you pulled the fuse for the "Telematics control unit module".
I wonder if you would have the same results if you turned it off in forscan?
I am thinking your thinking, ford is grabbing for straws thinking they have a fix for the battery drain by stating its with the AC module.

The BMS may be a issue on some mav. Hybrids but I am not seeing a issue on mine.
My battery is managed for voltage pretty well, it holds the voltage in the charging range.

I did a test, we will say, and I guess I made the BMS think the battery is full, and it held the voltage to the battery at 13.0 V, normally it 14.6v. (I was nervous when I noticed it was not charging like before.)
The 12v battery was not being charged but not discharged.
The DC to DC converter was supplying all the current to all the 12V items no matter what I turned on or off.
I changed the setting back and reset the BMS, and I am now seeing 14.6V like I have seen in the past.

 

[DanaL]

SSM 53801 2022-2025 Maverick - Hybrid - 12V Battery Drain - Built On Or Before 17-Feb-2025

Some 2022-2025 Maverick vehicles with a hybrid powertrain and built on or before 17-Feb-2025 may exhibit a 12V battery drain. This may be due to the software installed in the air conditioning control module (ACCM). To correct this condition, perform a battery condition test as outlined in Workshop Manual (WSM), Section 414-01 Battery, Mounting and Cables > Diagnosis and Testing > Pinpoint Test A. Service the battery as necessary. Connect a battery charger such as Rotunda GRX-3590 or DCA-8000 to the 12-volt battery. Download and run the "air conditioning control module (ACCM) software update" application in the Ford Diagnosis And Repair System (FDRS) scan tool. If the battery was replaced, download and run the "BCM-reset the battery monitoring sensor learned values" application in FDRS. For claiming, use causal part 19703 and applicable labor operations in Section 10 of the Service Labor Time Standards (SLTS) Manual.

They have coded the causal part number to the a/c compressor, so it will be covered 3/36, and I already checked and it is covered under Ford Premium ESP also...(not sure about the other level contracts)

Thank you for this. I'm bringing it in next week.

 

[Ozarkbeard]

I wonder if my f*cking HVAC will stop having a mind of its own......

Probably not, if the HVAC computer thinks it's too humid in the cab.
In my truck, at least, turning the HVAC system OFF stops the compressor from coming on at random times.

 

[710-oil-614]

Probably not, if the HVAC computer thinks it's too humid in the cab.
In my truck, at least, turning the HVAC system OFF stops the compressor from coming on at random times.

If you have the HVAC completely off in the 2025s it’s a total crapshoot the next time you start your Maverick as to if it will be on already or not.

 

[vandeda2024]

If you have the HVAC completely off in the 2025s it’s a total crapshoot the next time you start your Maverick as to if it will be on already or not.

Truth. The thing tries to be too smart for it's own good. Just leave it where I had it before dangit lol!

 

[710-oil-614]

Truth. The thing tries to be too smart for it's own good. Just leave it where I had it before dangit lol!

Doesn’t bug me as much with the hybrid especially in the summer months because it uses the dc scroll motor for AC. But winter time it will immediately kick the ICE engine off.

Like you said - trust me that I left it how I wanted it when I turned it off.

 

[Ozarkbeard]

...Wonder how long I can let it sit?

Normally, after around 14 days of not being driven, the truck will put itself into deep sleep mode, to protect the battery, so that it will start when you resume driving it.

 

[Ozarkbeard]

If you have the HVAC completely off in the 2025s it’s a total crapshoot the next time you start your Maverick as to if it will be on already or not.

(I never use Auto mode - always manual controls.)
If HVAC was OFF when I turned the truck off, next time I start it, it remains OFF until I manually tap the big power/fan control knob. If I left it ON, it has always come ON next time I start the truck.

 

[vandeda2024]

(I never use Auto mode - always manual controls.)
If HVAC was OFF when I turned the truck off, next time I start it, it remains OFF until I manually tap the big power/fan control knob. If I left it ON, it has always come ON next time I start the truck.

Not for the 25s. I never use Auto mode either. When I turn the Mav on, the HVAC settings is like a box of chocolates. You never know what you're gonna get. On, off, A/C on, A/C off ... whatever it decides lol, doesn't really matter what I had it set at lol.

 

[710-oil-614]

(I never use Auto mode - always manual controls.)
If HVAC was OFF when I turned the truck off, next time I start it, it remains OFF until I manually tap the big power/fan control knob. If I left it ON, it has always come ON next time I start the truck.

This is an issue specific to the 2025s.

 

[ZABSMAV]

This is big news and super exciting!!
I've heard some horror stories about software recalls making other things worse. Since my truck is still new, I'm probably going to wait another six months to ensure it doesn't have other side effects. However, this is a relieving find!

Ford has said in the SSM that this "may" (repeat ) "may" be one of the causes of the deep sleep problem. Obviously they are throwing spaghetti at the wall wanting something to stick. They have had since the 2022 model year to figure this defect out and yet they still use the word "may" in their notice.

 

[Timothyd]

How long? A tough question i would guess. Depends on the battery...how old is it, how many times has it been deeply discharged, what is the oat (outside air temp), as if it is cold, that affects it's ability to provide power....many variables.

AGM and other batteries other than li I do not want to discharge below 50 percent as these are considered deep discharges. And thusly, shortens it's life. It damages/warps the lead internal plates that store energy.

From what I understand the 12 volt battery acts like what I refer to as a "kicker battery...an rv term" or power source. It provides the energy to make the necessary initial electronic connections to then "wake everything else up" and enable your larger drive battery to start your vehicle via youe e-cvt. 12 volt for your door locks, internal lighting, etc.

My rule for what it is worth, is 7 days. Either I plug it in or go run some errands at that point.

I hope this has helped with your query, and others with more knowledge may chime in to correct anything I am mistaken on...and then I learn a bit more without doing it the hard way.

Cheers

Andy

Thanks. As I have a hybrid i make an effort to get in a decent drive every so often to get the engine to max temperature for awhile to lose moisture. About once a week. Probably good for the battery too.

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