I think my Auto start stop is not functioning

[Ryan091]

Mine had stopped working for several month and just recently decided to get with the program all on it's own. Weird truck....other things don't work all the time either, such as the power tailgate and the front windows. Left has bounce back and right didn't want to roll up on it's own without holding the switch.

Bad chips

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[maxinike]

lots of conditions must be met to have auto s/s working like temp, engine temp, seatbelt but the one people are not aware is the state of charge of the batterie . If below 70 % it will stop working cause want save power. Charge your batterie overnight with negative cable on chassis and reset BMS if possible and it should start working again. worth the try anyway

 

[Pete6114]

lots of conditions must be met to have auto s/s working like temp, engine temp, seatbelt but the one people are not aware is the state of charge of the batterie . If below 70 % it will stop working cause want save power. Charge your batterie overnight with negative cable on chassis and reset BMS if possible and it should start working again. worth the try anyway

I believe you're right, but i'm not buying a charger for a new truck. If that's the issue, Ford needs to inform me of that possibility and send me a charger, or even better yet, get a new updated APIM in my truck.

 

[maxinike]

Any slow charger compatible AGM will do the job.

 

[Aim64]

So to get the questions out of the way, the truck was built in February, I took delivery on March, so it most definitely has the Auto stop start feature. I drive on Econ mode, and the button to turn it off its not activated.

About a month ago, I noticed that the Auto start stop feature seemed to not work, whenever I stopped at a red light in the city it just doesnt shut off in places where it used to. I hit about 6 traffic lights on my way from the gym and the truck used to shut off about 80% of the time I stopped at a red light. For the last month though it just hasn't. In the last 3 weeks I have experienced the auto start stop once.

I think my auto start stop is oofed, or maybe I just suck at stopping? I am a very defensive driver and like to roll to a stop and not break heard at all.

I have issues with the auto stop . The vehicle has to have the battery at full capacity to work. When I take my truck on a 200 mile ride it works flawlessly. When I use my truck locally it doesn’t work . I’m hoping that when I get my OTA unfrozen from the dealer , the auto stop will work more efficiently.

 

[Bryan Simon]

My start/stop has not worked for a couple of months (not complaining at all).

But, I might spend 30-45 driving somewhere and then spend 90 minutes on Accy.
My unwind and “Me” time is about 90 minutes in the parking lot at work in the early mornings. No one trying to get chatty, dog not needing my attention, peaceful and quiet. Just the stereo playing low, and windows down.

Quite possible my phone battery is not fully charged on my work days, and I generally stay close to home on my off days—cause the dog pouts and wants to hang out with me.

 

[JayceeP]

Noticing the same issue with my 2021 2.7 Lariat all of a sudden. I think the engine has shut off once in the last two weeks. Even after a 20mins highway drive, the console said engine on due to vehicle charging. Weird…..

 

[maxinike]

Noticing the same issue with my 2021 2.7 Lariat all of a sudden. I think the engine has shut off once in the last two weeks. Even after a 20mins highway drive, the console said engine on due to vehicle charging. Weird…..

you have a low state of charge in BCM and 20 minutes driveway drive won't change the SOC. In this case the batterie may need be charged wit negative terminate on chassis or frequent long trip on highway but more that 20mins drive. Also vehicle need sit at least 8 hrs to update the SOC and resume normal function.

 

[JayceeP]

you have a low state of charge in BCM and 20 minutes driveway drive won't change the SOC. In this case the batterie may need be charged wit negative terminate on chassis or frequent long trip on highway but more that 20mins drive. Also vehicle need sit at least 8 hrs to update the SOC and resume normal function.

Thanks for the reply. Just curious what BCM means? I really haven’t done a long drive in a long time, do you think a short road trip would get the vehicle to sort itself out? I did a drive downtown yesterday and truck was on for about 20-25 mins in light urban and suburban stop and go. Turned off for 15-20 mins, back on for 20 min drive. Still no auto stop. Do you think this is related to the Electronic Control Module Recovery recall that’s out there for my truck? Field action # is 22B08

 

[maxinike]

The BCM is the body control module. Its the main module that take care of mostly all electrical and electronics in the truck. There is a strategy programmed that if the batterie go below a certain percentage usually around 60-70, some of the accessories or feature not required to keep driving will be turned off to preserve power. Some are auto s/s, heated seat etc. Keep in mind that by driving the truck you will charge the batterie at a certain voltage but the batterie need more time to be fully charged. The SOC is not the voltage on the batterie but the level of charge and its evaluated when the truck sit overnight by the BMS in the BCM. Its like take a dead batterie give it a quick charge and will show 12 volts but will not have the capacity of giving you power as if has been charged for 8 hours.

 

[Pete6114]

The BCM is the body control module. Its the main module that take care of mostly all electrical and electronics in the truck. There is a strategy programmed that if the batterie go below a certain percentage usually around 60-70, some of the accessories or feature not required to keep driving will be turned off to preserve power. Some are auto s/s, heated seat etc. Keep in mind that by driving the truck you will charge the batterie at a certain voltage but the batterie need more time to be fully charged. The SOC is not the voltage on the batterie but the level of charge and its evaluated when the truck sit overnight by the BMS in the BCM. Its like take a dead batterie give it a quick charge and will show 12 volts but will not have the capacity of giving you power as if has been charged for 8 hours.

Good explanation, thanks. Now, what's BMS and SOC?

 

[{tpc}]

Good explanation, thanks. Now, what's BMS and SOC?

Battery Management System and State Of Charge

 

[Pete6114]

Battery Management System and State Of Charge

So, the days of charging a Battery and off we go, are history?

 

[{tpc}]

So, the days of charging a Battery and off we go, are history?

Not necessarily, just a bit more refined?

You usually hear about BMS and SOC in terms of lithium batteries, at least I do anyway. Because a lot of lithium batteries on the market have BMS built into them.

 

[Snakebitten]

Yea, the latest automotive innovations are starting to take a toll on some percentage of the vehicles sold. Especially those driven less seldom or are only driven short intervals.

The 12V battery itself is far more taxed than ever. Especially before and after the engine has been turned on. There are now modules that are active for as long as 75 minutes after you walk away from the truck.

And it's not just the battery. Short drive intervals also can tax the oil in these modern direct injection and forced induction (Turbo) motors. If the vehicle never gets a chance to operate at fully hot oil temps, then the oil can become contaminated with fuel that never gets burned off, so to speak.

For those that intend to own these amazing products well beyond warranty it's not a bad idea to invest in some kind of battery tender and make the effort to keep the battery healthy when the vehicle isn't in use. (motorcycle guys aren't so offended by this kind of effort)

And in my opinion the oil change interval should be shortened for the vehicles that represent the before mentioned kind of use.

I really enjoy the explosion of technology in the automotive realm. It amazes this old geezer. But it's hard to ignore some of the negatives that can come along with it.

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