Reduced power with no Fault code

[thequackenbush]

Has anyone figured out what is causing this? I have had my 23 Lightning ER for just over a year and experienced this issue for the first time yesterday. While stopped at a red light I turned the truck off, restarted it, and once I put it in drive it dropped from 100% power, to 66%, then 56%.

What drive mode were you in?

 

[bclightning]

What drive mode were you in?

Normal drive mode - I did change over to sport but it did not make a difference.

 

[thequackenbush]

Ok was only asking bc I had a theory this was occurring bc I was opting to begin in Sport mode.
I have no idea. Am currently corresponding with Fords social media team here to see WTH they think is going on.
I love this truck- i want to continue to love this truck, but he nightmare scenario is being somewhere with the family and both engines decide they dont want to work, or have a full load in the truck and one engine kicks off and suddenly the solo engine can't handle it.
Anyway, I'll update you to let you know what, if anything, they find out

 

[bclightning]

Thanks! I love my truck as well, but share similar fears. Hope they get back to you soon.

 

[YellowGoat]

I had it happen a few times a while ago. Cleared itself ok and truck has been fine for another 7-8k-ish miles since and hasn't happened again. As far as I can tell, nothing to worry about. I know; famous last words, but it does seem to just be an oddity.

 

[Bandit216]

Sadly, not just an oddity. I've had my power fluctuating all over the place since I had a battery module in my 10,000 mile 2022 Lariat ER replaced 6 weeks ago. It has dropped as low as 19% when I was trying to pass another vehicle. Not good.

Available power will be 100% immediately after charging and, often, initially after starting. However, within 5 to 10 miles it will usually drop, then start wandering all of the dial. I've taken it back to the dealer but they guessed it was related to the battery relearning it parameters (The truck will only charge up to ~76%). I'm driving it carefully to give the battery a chance to "relearn its parameters", but I'm not convinced and definitely not happy.

 

[YellowGoat]

Sadly, not just an oddity. I've had my power fluctuating all over the place since I had a battery module in my 10,000 mile 2022 Lariat ER replaced 6 weeks ago. It has dropped as low as 19% when I was trying to pass another vehicle. Not good.

Available power will be 100% immediately after charging and, often, initially after starting. However, within 5 to 10 miles it will usually drop, then start wandering all of the dial. I've taken it back to the dealer but they guessed it was related to the battery relearning it parameters (The truck will only charge up to ~76%). I'm driving it carefully to give the battery a chance to "relearn its parameters", but I'm not convinced and definitely not happy.

Ouch sorry to hear that. Yours sounds like a very different issue than what I've seen and the folks I was replying to. Mine was immediately dropping to a consistent 56% power upon shifting out of park after a longish L1/2 charge in the garage. The front motor was not reporting power or regen on the gauge cluster. Letting it sit for about 20 min when I reached my destination resolved the issue each time. I haven't had any battery modules replaced.

I'm far underqualified to diagnose your issue, but that doesn't sound like "relearning parameters" or the front motor just being "off" for a bit. That sounds more like battery pack / BMS shenanigans and certainly a bit more serious.

 

[Bandit216]

Yes, I should have added that the traction display is showing both motors working properly (even at 19%) and I have checked coolant levels. All modules have been updated via FDRS as of last weekend.

I do believe the power limit is related to the battery module replacement as I ran an FDRS battery health check and it showed all the cells in module 5 much lower than the other cells\modules. Even with both the performance limit and the battery charging issues there are no errors displayed on the screens or fault codes stored in FDRS. That's why I was hoping this thread might have some answers. I'll give it a month of hard (but careful) driving then start a case with the BEV team.

 

[TaxmanHog]

I do believe the power limit is related to the battery module replacement as I ran an FDRS battery health check and it showed all the cells in module 5 much lower than the other cells\modules. Even with both the performance limit and the battery charging issues there are no errors displayed on the screens or fault codes stored in FDRS. That's why I was hoping this thread might have some answers. I'll give it a month of hard (but careful) driving then start a case with the BEV team

Those numbers indicate they may have complete skipped / or didn't do the balancing correctly on the replacement pack to the mean of the rest of the modules in the pack! I hope it catches up over the next 21 days!!!!

 

[Gimme_my_MME]

Yes, I should have added that the traction display is showing both motors working properly (even at 19%) and I have checked coolant levels. All modules have been updated via FDRS as of last weekend.

I do believe the power limit is related to the battery module replacement as I ran an FDRS battery health check and it showed all the cells in module 5 much lower than the other cells\modules. Even with both the performance limit and the battery charging issues there are no errors displayed on the screens or fault codes stored in FDRS. That's why I was hoping this thread might have some answers. I'll give it a month of hard (but careful) driving then start a case with the BEV team.

Your voltage differential is large enough that it is unlikely to resolve itself on its own. The dealer needs to balance the array correctly and that will resolve the issues you are seeing

 

[Mustang11s]

Just experienced this for the first time. For the record I am a dealer tech. Ford Senior Master Tech and my dealers only EV tech. Have not had any customers have this concern, and this is my own personal vehicle. Left work and about 5 minutes into my drive home hit the go pedal hard and went nowhere. Remembered reading about this and pulled up the power distribution screen and yep. Zero power or regen from the front motor and the 56% power restriction on the screen felt more like 30% available. Shut it off 5 times still the same. Drove back to work plugged in the FDRS and no dtc’s in any module. Cleared all just for the heck of it and no change. Did a 12V disconnect for 10 minutes and fixed. Fun stuff. Over 16k miles with zero problems other than infotainment screen freezing. 22 ER XLT early production demo unit.

 

[Mustang11s]

Other video I could not get to upload on my last post

 

[Knightro2]

I just has this happen to me this morning. My truck was at the dealer for a month a few weeks ago getting a battery module replaced. I got it back and then flew out of town for a week so it wasn't driven. Worked fine yesterday. Got in it this morning and it went to 56% throttle when I shifted into reverse. Figured I could get to work and worry about it tomorrow. As I drove a .Ile it went down to 51%. I did notice a single click sound coming from the front when I accerlated from a stop but didn't think to check the motor power distribution. Turned around and went home and called the dealer. Got back in it about 10 minutes later and all is fine. So now I'm just monitoring it.

 

[Ford Motor Company]

I just has this happen to me this morning. My truck was at the dealer for a month a few weeks ago getting a battery module replaced. I got it back and then flew out of town for a week so it wasn't driven. Worked fine yesterday. Got in it this morning and it went to 56% throttle when I shifted into reverse. Figured I could get to work and worry about it tomorrow. As I drove a .Ile it went down to 51%. I did notice a single click sound coming from the front when I accerlated from a stop but didn't think to check the motor power distribution. Turned around and went home and called the dealer. Got back in it about 10 minutes later and all is fine. So now I'm just monitoring it.

Good afternoon, Jay! I would be glad to help you out with reduced power concern should you need any additional assistance. Just shoot us a private message with your VIN and dealer name/location, and I'll get right on it. Thank you! To send a private message, just click on our username and select "Start Conversation".

 

[Knightro2]

Thank you, I just messaged you.

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