Deep Sleep Mode [updated with Detroit Free Press article about 12v battery drain issue]

PolishT247

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Update: Detroit Free Press has written an article on the 12v battery drain issue
-- https://www.freep.com/story/money/c...-ford-f-150-pickups-battery-drain/6753464002/


I launched the FordPass app today and my truck is in Deep Sleep Mode. I was in the truck yesterday morning with the engine running. Seems like a very short time. Does anyone know what is the criteria for the vehicle to enter this mode?





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Pedaldude

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The information should be in the service manual for electrical trouble shooting. I know that on my Lincoln, a bunch of modules run for exactly 45min. before turning off and even afterward, it still draws more current than my other vehicles, despite being in spec. I can only imagine on the newer trucks.

Many people have been reporting their batteries being weak from the start and reading less than 12v. If that is the case, I imagine that the Deep Sleep mode will activate fairly soon. A bad battery won’t keep a charge very long.

One of the best ways to see if your battery is weak is how much the voltage drops when you crank the engine over.

I’ve got a voltmeter that plugs into the cigarette lighter that works great for testing batteries as well as diagnosing charging system problems. They really ought to have a digital volt readout on the dash.
 

KBKEITH

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My truck went in to deep sleep mode once and the only way to bring it back to life was a jump start. Had to use the physical key in the fob to open the door.
 
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PolishT247

PolishT247

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Thanks for the feedback. I have joined the dead battery club. I just saw the other post on this and did not put two and two together.
 

Bryan Simon

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Are all these dead battery issues related to the PB trucks or all they all from Dearborn?

I’m beginning to wonder if it is a “bad battery lot” or a wiring harness issue.

Just trying to narrow it down some
 

KBKEITH

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Are all these dead battery issues related to the PB trucks or all they all from Dearborn?

I’m beginning to wonder if it is a “bad battery lot” or a wiring harness issue.

Just trying to narrow it down some
Mine is from Dearborn, built on 11/24 with the 2.7.
 

KBKEITH

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Thanks for the feedback. I have joined the dead battery club. I just saw the other post on this and did not put two and two together.
Welcome to the club! It’s where all the cool kids are.
 

Bryan Simon

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Okay, I guess if it is not PB only, that could be taken out of the equations.

If not a lot of batteries failing, I can see it being a harness issue.
I wonder if those are outsourced.
 
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PolishT247

PolishT247

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Mine truck is a 3.5 ecoboost built in Dearborn on 1/18/2021. Dead as a door nail today. Drove the truck this past Sunday on a 100 mile trip.
 

BMWtoF150

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Over on the FSA 21B08 thread, it was reported by a member that his dealer said this flash was to deal with a certain condition that would drain the battery in 17 hours.
 

Jim Bandy

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I been reading - researching this deep sleep mode. A lot of information that I found dates back to 2017 with Ford F150 owners + other Ford models. The results I found all centered around weak (neededing charge and/or dead batteries). So with the comments on getting a flash message through Ford Pass today - maybe Ford found a contributing factor. Hope it solves the issue.
 

KBKEITH

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<—————
Heads over to FSA 21B08 thread.....


Over on the FSA 21B08 thread, it was reported by a member that his dealer said this flash was to deal with a certain condition that would drain the battery in 17 hours.
 

ldsavow

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Jim Bandy

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Tracking - I have it already on my list. I have a larger one in the garage - but want a compact one. I have the GB150 and the Foxwell 715. Foxwell is going to the dealership when they deliver the truck. Going to run a batty & charging teset before signing ofr my truck. Also going to warn the service manger about Rust & Weak Ass batteries.
 

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