Deep Sleep Mode triggered at what cold temperature?

[sdingeldein]

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?

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[Grumpy2]

Also, when it is cold, if I plug it in at night will it heat up normally in the morning?

Plug in at night and set a departure time and it will heat the battery and the interior for you.

 

[Heliian]

deep sleep modes

I live in the cold and have cold soaked my truck for days, never heard of deep sleep mode and its not in the owners manual.

Where did you hear about this?

Edit: I see it's a fordpass connectivity thing and isn't specific to the lightning. It's 12v battery most likely reporting a lower voltage.

 

[sdingeldein]

Interesting as they just checked the 12V and said it was OK.

 

[Heliian]

Interesting as they just checked the 12V and said it was OK.

There have been a few areas of concern with the 12v battery.
Poor connections at the battery AND in the wiring beyond the battery
12v battery monitor system, the sensors attached to the battery had to be replaced, it was a CSP from ford.
Just generally weak batteries. Standing voltage is not a good way to determine actual battery capacity.

 

[TaxmanHog]

When they tested you battery, could have been step 1 of the service visit.

Then you had a bunch of diagnostic and software updates, if they required 12v power booster support and they failed to connect one, then the 12v might have been stressed and low on V's & AH's, take it for a nice long drive, or idle the truck parked in your yard/garage for several hours with the HVAC blower set on 5+, hopefully that replenishes the 12v battery and your trucks hibernation events should diminish.

 

[Adventureboy]

never heard of deep sleep mode and its not in the owners manual.

It's real. If the voltage of the 12v battery falls too low (on my 2023 ER it is between 40-50% SOC) the truck shuts down non-essential modules including the modem, killing FordPass remote start and any other functions that require WiFi or Cellular connectivity. The good news is that it charges the 12v battery from the HVB when it happens.

 

[Heliian]

It's real. If the voltage of the 12v battery falls too low (on my 2023 ER it is between 40-50% SOC) the truck shuts down non-essential modules including the modem, killing FordPass remote start and any other functions that require WiFi or Cellular connectivity. The good news is that it charges the 12v battery from the HVB when it happens.

LOL, yes, the last paragraph of my post describes this feature as fordpass specific and not related to any one vehicle. I assure you it's 12v related as I've coldsoaked before at - 25degC and have never seen this behaviour,maybe prolonged periods below - 30? Regardless, it does not happen at 1degF per the OP.

From ford:
Deep Sleep mode is designed to conserve battery power on your vehicle. This setting is activated when your vehicle falls under the following conditions:

Vehicle inactivity for 14 consecutive days

The battery voltage drops below 9.5 volts

Extremely cold/hot weather conditions


How to Turn Off Deep Sleep Mode
To turn off Deep Sleep Mode, turn on your vehicle manually using the push-button start or your key. It may take 20-30 seconds for your modem to reconnect with the FordPass®* App.

 

[Adventureboy]

The battery voltage drops below 9.5 volts

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

 

[Heliian]

9.5volts is pretty much dead

Ya, I thought that was weirdly low, anything below 12.0v would essentially be a dead battery, especially for starting an ice vehicle.

 

[Adventureboy]

Standing voltage is not a good way to determine actual battery capacity.

The BMS keeps track of a number of parameters. On an AGM battery, voltage correlates pretty closely to SOC but as you said, it doesn't tell you anything about actual capacity.
The LVB capacity is tracked by the BMS as it ages and declines. There is a parameter that shows the actual calculated capacity of the existing battery and can give you an indication of LVB health. Folks with FDRS can see this parameter and it is available remotely by the dealer. When I called to book an appointment, the service person could see my LVB capacity was 35 vs 55 new.

 

[sdingeldein]

LOL, yes, the last paragraph of my post describes this feature as fordpass specific and not related to any one vehicle. I assure you it's 12v related as I've coldsoaked before at - 25degC and have never seen this behaviour,maybe prolonged periods below - 30? Regardless, it does not happen at 1degF per the OP.

From ford:
Deep Sleep mode is designed to conserve battery power on your vehicle. This setting is activated when your vehicle falls under the following conditions:

Vehicle inactivity for 14 consecutive days

The battery voltage drops below 9.5 volts

Extremely cold/hot weather conditions


How to Turn Off Deep Sleep Mode
To turn off Deep Sleep Mode, turn on your vehicle manually using the push-button start or your key. It may take 20-30 seconds for your modem to reconnect with the FordPass®* App.

Yeah, the message of deep sleep goes away when I drive the vehicle a few miles. This morning I got a message as I parked the truck that said "system off to Save Battery". I'm taking it back to the dealer this Thursday.

 

[Adventureboy]

Yeah, the message of deep sleep goes away when I drive the vehicle a few miles. This morning I got a message as I parked the truck that said "system off to Save Battery". I'm taking it back to the dealer this Thursday.

If you get it regularly, it is a sign the 12v battery may be weak but if the dealer says it is ok, here are some other things that can cause it:

• An aftermarket device that is drawing the battery down when truck is off like always active Dashcam.
• Several days of inactivity without driving the truck - Even if it is plugged in, the truck won't charge the 12v battery unless the HVB is actively charging
• Several consecutive short drives that don't allow the 12v to fully charge. The short drives activate all of the modules that then stay active for a period of time after you power off, leaving the 12v more depleted than before the drive. Driveway shuffling is especially bad for this.
• a combination of the above

Do you get any FordPass messages like "Electrical System Drain Service Required" or "Plug in to Maintain 12v Battery"?

The good news is that it charges the 12v from the HVB when this happens so you don't come out to a dead truck. The bad news is that Ford installed a tiny anemic 12v battery for a power-hungry beast.

 

[sdingeldein]

If you get it regularly, it is a sign the 12v battery may be weak but if the dealer says it is ok, here are some other things that can cause it:

• An aftermarket device that is drawing the battery down when truck is off like always active Dashcam.
• Several days of inactivity without driving the truck - Even if it is plugged in, the truck won't charge the 12v battery unless the HVB is actively charging
• Several consecutive short drives that don't allow the 12v to fully charge. The short drives activate all of the modules that then stay active for a period of time after you power off, leaving the 12v more depleted than before the drive. Driveway shuffling is especially bad for this.
• a combination of the above

Do you get any FordPass messages like "Electrical System Drain Service Required" or "Plug in to Maintain 12v Battery"?

The good news is that it charges the 12v from the HVB when this happens so you don't come out to a dead truck. The bad news is that Ford installed a tiny anemic 12v battery for a power-hungry beast.

I get the second message frequently but not since it was in the shop last week.

 

[Adventureboy]

I get the second message frequently but not since it was in the shop last week.

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?

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