Deep Sleep Mode triggered at what cold temperature?

[sdingeldein]

What year is your truck? There was CSP 23B70 to replace the BMS sensor on the 12V battery for some 2022 and 2023s. I get the messages much less frequently after they replaced that. Perhaps they did that CSP when it was in the shop?

I don't know. They said they did some CSPs and "flushed out the system" software wise (whatever that means).

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[mrau]

Take a look at your BMS sensor on the 12v battery. It should have a date on it.
Can't recall the version # or the dates that were replaced, but if it is after October 2023 it should be good.

 

[Maquis]

Take a look at your BMS sensor on the 12v battery. It should have a date on it.
Can't recall the version # or the dates that were replaced, but if it is after October 2023 it should be good.

It‘s not the date. If the Part number suffix is -AC or -AD, it must be replaced.

 

[sdingeldein]

Take a look at your BMS sensor on the 12v battery. It should have a date on it.
Can't recall the version # or the dates that were replaced, but if it is after October 2023 it should be good.

My truck was built in August/Sept 2023 and arrived in my town mid October.

 

[mrau]

You may be in the range. Best to check your BMS Sensor part number as @Maquis stated.

Here is a page from the recall notice.

 

[davehu]

It happens well before 9.5 volts. In my last event, it occurred at around 12.2 v and a SOC of 43% as measured through an independent monitor. On an AGM battery, 9.5volts is pretty much dead

Seems to me that if your HVB is at 43% it should be charging the LVB to keep it at 12v. there shouldn't be a problem unless the HVB is near dead

 

[Adventureboy]

Seems to me that if your HVB is at 43% it should be charging the LVB to keep it at 12v. there shouldn't be a problem unless the HVB is near dead

It does. When the LVB SOC drops too low, it shuts off a bunch of modules including the modem to save power and then charges the LVB. It takes about an hour if uninterrupted.

 

[Kansan]

It turned fairly cold in NC 1 week ago with lows in the low 20s. A couple of mornings my car has not heated up (not plugged in) and my watch reports the vehicle is in deep sleep modes. I know from the Ford site that there are three things that will put it into deep sleep: not driving for 14 days, voltage issues, and cold/hot weather. My truck was in last week because of odd electrical issues but they just did CSPs and reset the system and it's been fine since then.

My question is this: how cold does it need to be to go into deep sleep mode? Also, when it is cold, if I plug it in at night will it heat up normally in the morning?

I just got back from an extended trip (18 days) during which I left my 24 Flash plugged in to a ChargePoint charger at the airport. The truck only has 2400 miles on it, but the 12V battery is reporting 350+ days in service. I have an ANCEL battery monitor installed, so I can see the LVB voltage during the entire trip. All accessories, other than the ANCEL, were disconnected. A few observations for the good of the cause:

- When the outside air temp (OAT) was below about 15F, the truck charged the 12v battery for about 14-15 minutes per session at 6-7 hour intervals. I'm assuming this was during events to warm the HVB. The colder the OAT the longer the warming event - some were 21 minutes when the OAT was below 0F. The 15-21 minute charge did not make up for the 20 minutes that the modules were awake after the warming event - on most warming events the LVB lost 0.02V or more.
- I was able to access the truck via Fordpass 4 days into the trip even though LVB was at 12.45V.
- I added 5% charge to the HVB at the end of 4 days and that brought the LVB to 12.83V.
- At 5 days without starting the truck, FordPass went into deep sleep mode with the LVB at 12.79V. OAT was 3F.
- Fordpass became connected again during events set up with Departure Times. I had a few departure times that I hadn't deleted, and I was able to access the truck via FordPass while the truck was preparing for departure. During those events I could manage the Target Charge, Departure Times, etc.
- During one of the departure preps 12 days into my trip, I bumped the target charge 5% and the LVB charge went from 12.43V to 12.90V. The higher voltage did not re-enable access via FordPass (I continued to have access only during departure prep).
- I was also able to access the truck via FordPass during the warming events. I caught it twice and was able to manage target charge, departure times, etc.

By comparison, my 23 Lariat 5.0 was sitting on a trickle charger in the garage and it went into deep sleep mode 14 days after it's last drive with the LVB sitting at 13.0V.

 

[SMMD]

Observation about Deep Sleep mode, not completely related to OP’s question about it being related to cold. Others have answered how deep sleep works, but I noticed something I haven’t seen addressed in the forum yet. I left my truck idle for over 90 days, not plugged in, while taking an extended trip. Somewhere between 14 days and 28 days idle, it went into deep sleep, as noted on FordPass. Following Ford’s recommendation for extended idle periods, I left it at 50% SOC. When I returned, it started right up, and the SOC was 49%. I was impressed that in 90 days, it only lost 1%. Deep Sleep Mode seems well designed, at least for long idle times in not frigid temps. The temperature was not very cold, probably in the 40s through the 60s the whole time.

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