Sponsored

Pull over safely + decreasing charge rate

First Name
Robert
Joined
Feb 3, 2026
Threads
1
Messages
5
Reaction score
5
Location
Titusville, FL
Vehicles
2024 F150 Lightning Lariat
Occupation
Systems Engineer
I've been scouring this forum looking for someone reporting this exact issue, but I've come up short so I decided I should post my experience in case others run into this problem. This started a few days ago, so hopefully I'm remembering all of these details correctly. I will preface this with the fact that I'm in Central Florida, and all of this started on the coldest weekend I have ever experienced here (mid 20's, Brr). That said, I do not think the cold prompted this since I know others are in much colder climates. The below timeline is from start to present, and I'll provide more updates as I get them. I have included photos as well of the DTC's that were present when we first hooked FDRS up, as well as the battery test, while the photo of the graph shows the charge rate decreasing steadily.

1/31 7:50P - Truck at 38% SOC

I go out to the truck to run to the store, back the truck out of the driveway and as soon as I'm at the end of my driveway I get the "Pull over safely" alert, and notice that the trucks power is reduced to 2%. The truck is on, but will not move in any direction. I grab my neighbor's truck and go to the store. When i came back, I got in the truck and was able to drive it again. I moved it and plugged it in to charge. I plugged it in at my neighbors (Also a proud Lightning owner) because I have a bunch of woodworking tools setup in the garage blocking me from my charger right now.

1/31 9:30P - Truck on charger

Neighbor texts me that the charge rate seems low (he has a bunch of electrical monitoring setup in his house, so was able to see remotely that the charge rate was going down). I thought maybe the cold weather was causing a decreased charge rate. Neighbor grabbed his FLIR camera and checked thermals on the breaker, charger, cord, and truck charge port. Everything seemed fine. The charge rate eventually dropped to 1.2KW and stayed there. At this point we start to assume maybe a bad battery cell, so we get an FDRS license for the weekend to do diagnostics and updates.

2/1 2:30P - Updates and Diag

We tested every module with FDRS and everything came back clean. Ran a battery health check and everything seemed good. Battery health at 99.5% and all cells were balanced. No alerts and no indication that the battery has an issue. However during all of this the "Pull over safely" came up again, and never went away. After we completed all the updates and tests, I reset the 12V battery and the truck was happy again (besides the Low Washer Fluid warning, which was accurate).

At this point, I take the truck for a drive, not far, but just stretching it's legs. Drives fine, no problems. I took it home and put it back on the charger. At this point the battery is at like 60% SOC. The charge rate starts at ~9KW, and over the span of 30 minutes or so, went from 9 -> 7 -> 6 -> 4 -> 3 -> and eventually down to 1.2KW. I leave it to charge over night, not expecting any miracles.

2/2 8AM - Pull over safely

I go to leave the next morning and again the truck greets me with "Pull over safely" and will not start. I went and reset the 12V system again and that solved it and I was able to drive away. Drove to work and called the local dealer. About 30 minutes later I drove it to Cocoa Ford, which is right around the corner from my job. They take it in and do there thing.

Cocoa Ford Service - Day 1

They ran full diagnostics, drove it, charged it, and said that they could not recreate the "pull over safely" issue. However, I remind them that there is another issue and that is the charge rate going down. They seem to keep ignoring this, which starts to frustrate me. Service advisor told me they didn't know how to see the charge rate, so I drove over there and showed them where to see the charge rate. They keep it over night so they can let the service tech review it again with this new information.

Cocoa Ford Service - Day 2

I can see on the app that they're charging it and driving it throughout the day. I notice that the charger is still only doing 1.2KW and I text the service advisor that if they look at the charge rate, they'll see the problem. I get no updates or responses from the service team all day, so I go over there at the end of the day. Of course, everyone involved (advisor, tech, and foreman) are gone for the day. The advisor that I spoke to just told me the notes still reflect that they can't recreate the issue. I start to get flustered and tell them that if they go outside and look at the charge rate right now, the problem is ongoing. After waiting to speak to the service manager for a few minutes, I decide to leave and just talk to my advisor in the morning.

After leaving, the service manager calls me and tells me that he talked to the tech, and that they're still working to recreate the issue. I sent him screen shots of the charge rate on the truck going down from 9KW -> 1KW and I tell him, again, that the issue is already duplicated and is visible right now. That the charge rate is not where it should be. I also offered advice on issues I had heard of, such as a bad thermistor making the truck thing the charger is getting hot and reducing power to avoid an issue. He tells me that he will get with all the team members involved in the morning and review.

Cocoa Ford Service - Day 3

I notice when i wake up that service has performed a master reset, so I no longer have visibility to the truck through Ford Pass to see what is going on. They text me and confirm that they performed a master reset, and they put it on the charger. Right now truck indicates full charge by 11:30, and they're waiting to see if it charges normally now.

At this point I request a loaner truck, which they did provide me ('25 F150 XLT ICE).

If the truck does charge to 100% by 11:30, I might agree that the charge is working properly since there is no way it's going to get to 100% by 11:30 if it's at 1.2KW. But since I can't see the charge rate remotely I'll have to take their word at this point.

Edit: Forgot to redact sensitive info from the photos

Ford F-150 Lightning Pull over safely + decreasing charge rate photo_2026-01-31_19-53-27


Ford F-150 Lightning Pull over safely + decreasing charge rate photo_2026-01-31_22-29-26


Ford F-150 Lightning Pull over safely + decreasing charge rate Screenshot 2026-02-04 121148


Ford F-150 Lightning Pull over safely + decreasing charge rate Screenshot 2026-02-04 121301


Ford F-150 Lightning Pull over safely + decreasing charge rate Screenshot 2026-02-04 121237


Ford F-150 Lightning Pull over safely + decreasing charge rate Screenshot 2026-02-04 121323


Ford F-150 Lightning Pull over safely + decreasing charge rate Screenshot 2026-02-04 121342
Sponsored

 
Last edited:

TaxmanHog

Moderator
Moderator
First Name
Noel
Joined
Jan 19, 2022
Threads
218
Messages
16,024
Reaction score
17,989
Location
SE. Mass.
Vehicles
2022 Lightning Lariat-ER & 2024 HD Road Glide CVO-ST
Occupation
Retired
Looking forward to the fix report.
 

chriserx

Well-known member
First Name
Chris
Joined
Oct 3, 2025
Threads
1
Messages
594
Reaction score
431
Location
Louisiana
Vehicles
2025 Ford Lightning Flash Job 2 😭
There is another one near the pack, but I don't remember which thread it was in.
 
OP
OP
talesofthrkryp
First Name
Robert
Joined
Feb 3, 2026
Threads
1
Messages
5
Reaction score
5
Location
Titusville, FL
Vehicles
2024 F150 Lightning Lariat
Occupation
Systems Engineer
Update: Truck is still not charging adequately. They are now engaging the Ford Engineering team for advice on next steps.
 

Sponsored
OP
OP
talesofthrkryp
First Name
Robert
Joined
Feb 3, 2026
Threads
1
Messages
5
Reaction score
5
Location
Titusville, FL
Vehicles
2024 F150 Lightning Lariat
Occupation
Systems Engineer
Pretty confused cause your screenshot show the BECM codes that are causing your issue.
Those codes were present when first opened FDRS. Cleared the codes and they did not come back. All modules tested and passed.
 

chl

Well-known member
First Name
CHRIS
Joined
Dec 16, 2022
Threads
7
Messages
2,777
Reaction score
1,734
Location
alexandria virginia
Vehicles
2023 F-150 LIGHTNING, 2012 Nissan Leaf, 2015 Toyota Prius, 2000 HD 883 Sportster
Occupation
Patent Atty / Electrical Engineer
Sound like there could be a problem with the 12v system to me - either the 12v battery or some other issue (broken wires, etc).

Really cold weather slows down the chemical reactions that release energy from the 12v battery and this is the time when weak batteries will fail.

If the AC charging is being slowed down and the other symptoms go along with that, the truck thinks something is wrong with the HVB - you checked it and say it is in good health. So if the 12v battery is low, it could cause an error in the HVB control system and produce those messages and slow down AC charging.

These trucks are computers with wheels, and if the computer components aren't functioning properly because of a bad 12v supply, things like this can happen. Keeping the 12v battery topped off with a maintainer should eliminate that possibility.

It might also be a problem with the on-board charger itself, used when AC charging, or the HVB battery control system components.
 
OP
OP
talesofthrkryp
First Name
Robert
Joined
Feb 3, 2026
Threads
1
Messages
5
Reaction score
5
Location
Titusville, FL
Vehicles
2024 F150 Lightning Lariat
Occupation
Systems Engineer
Update:

Dealer says that the battery finally charged to 100%, and further acknowledged there is clearly an issue. Later on they also reported that the truck is now throwing a code indicating a bad battery cell. They're "waiting for it to act up" so they can pinpoint the bad cell for replacement (their verbiage). They seem to indicate that if they can't pinpoint it within a couple of days, they're going to just give me the truck back and send me on my way.

I really want to get the truck hooked to a DCFC after draining it some to see how the charge goes. My thoughts being:

If DCFC behaves normally, the on board AC charger is likely the issue. Since a battery throttle (thermal or balance), or a charge port thermal throttle should also present on DCFC.

If DCFC behaves the same way, with degrading charge rate, then the on board charger is likely fine, and it's more likely a pack or charge port issue.

This wouldn't necessarily be a conclusory test, but it would further isolate the issue for my own "got to know" mind.
 

Sponsored

chriserx

Well-known member
First Name
Chris
Joined
Oct 3, 2025
Threads
1
Messages
594
Reaction score
431
Location
Louisiana
Vehicles
2025 Ford Lightning Flash Job 2 😭
If DCFC behaves the same way, with degrading charge rate, then the on board charger is likely fine, and it's more likely a pack or charge port issue.
It very likely wouldnt be a port issue either since L2 and DCFC are different pins, not impossible, just unlikely.
 
 







Top