"Electrical System Drain. Service Required." DIY Fixes?

[lister coggs]

Hi everyone!

I’m hitting a wall with my 2022 Lightning SR and looking for advice before I get deeper into expensive dealer diagnostic fees. (My bumper-to-bumper warranty has freshly expired.)

I am getting the persistent "Electrical System Drain. Service Required" message.

The truck constantly goes into "Deep Sleep" mode overnight (no remote access/FordPass control). This did start occurring after the most recent update (which included Blue Cruise lane-changing and PAAK walk-away lock), so there may be a connection.

What I’ve done so far:

-Replaced the 12V Battery: Installed a new AGM battery

-Manual Charge: I've tried two times to top off the new battery to 100% and reset the BMS.

-PAAK Disabled / Bluetooth on Phone Off Overnight - I turned my Bluetooth off in case its proximity in my house was triggering the vehicle to turn on.

-Accessories: Unplugged everything. The rear-view mirror connected dashcam (which I used for 2 years with no issue) is gone. Nothing in 12V/USB/120V/240V outlets.

The issue persists despite the new battery. I checked my BMS Sensor on the negative terminal.

-The part number is NL3T-10C652-BA.

-I know CSP 23B70 calls for replacing sensors ending in -AC or -AD, but I have -BA. Has anyone with the "-BA" sensor had this failure?

Questions:

-Since I'm out of the 3-year/60k km bumper-to-bumper (it's a '22), is this BMS sensor covered under any emissions or EV component warranty in Canada?

-If the sensor is fine, what else causes the "System Drain" message on a healthy new battery? A stuck module (GWM/APIM)?

-Has anyone successfully argued for "Goodwill" coverage on this since it's a known defect (CSP 23B70) even if my VIN/Part# isn't perfectly aligned with the bulletin?

-Any advice on costs or DIY fixes (Forscan? Removing fuses to trace? etc.) would be appreciated. I have a feeling this is software-related, so I'm tempted to just run a manual cut-off to the 12V battery until the next software update. I'm concerned this is going to cost a lot of money at the dealer to sort out.

Thanks all!

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[Heliian]

Installed a new AGM battery

How old is the battery and was it tested? Sometimes batteries will sit on a shelf for a long time and lose capacity.

 

[bmwhitetx]

Your BMS is the new one. Your dealer must of performed the service at some point. So I think you can rule it out as the issue.

Also no need to constantly reset it. It stores the age of the battery so every time you reset you are telling the truck you have a new battery and it will treat it as such when calculating the SOC.

Do you have a OBD dongle in the OBD port?

 

[lister coggs]

How old is the battery and was it tested? Sometimes batteries will sit on a shelf for a long time and lose capacity.

Good question. I didn't test it. I do have a battery load tester but assumed it wouldn't work with this battery. There is a sticker on it says 5/25, so it's not that old I don't think.

Your BMS is the new one. Your dealer must of performed the service at some point. So I think you can rule it out as the issue.

Also no need to constantly reset it. It stores the age of the battery so every time you reset you are telling the truck you have a new battery and it will treat it as such when calculating the SOC.

Do you have a OBD dongle in the OBD port?

No OBD dongle in the port. However, I did just put one in and checked error codes. I got a B1616 CONFIRMED - Wiper Rear Disable Switch Circuit Open: System Internal Fail with my BlueDriver dongle, so that could be a hint to what's causing this.

 

[bmwhitetx]

Your DTC code is B1616. Your reader is giving a possible explanation that is odd. The code is generically a high system load when truck is off. If you search for “F-150 B1616” you will find others with it and what they found. A quick look shows some folks had a bad module, headlights left on, etc. Good luck.

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