Reduced power - no warning lights

[Firn]

On the theme of the OP about reduced power no alerts or wrenches thrown.................

In the past couple of months, I've experienced a reduced power output briefly after starting the truck, yesterday was the latest observation.

I was preparing the truck for a long drive day, hitting several club events on four wheels instead of two with the damp, foggy & rain forecast.

I charged to 95% Friday night, then programmed a departure time event for t-minus 10 minutes from actual leave time. FCSP logged about 6.3 kWh to prepare the battery under moderate conditions 50's, I got the alert that the truck was ready to drive, went out to start her up, SOC picked up a percentage point, rolling out of the garage with 96%

As I put truck in drive I noticed power output limited to 56%!?

I shut her down, opened the door to clear the accessory mode, waited 30 seconds, then fingers crossed ..... I restarted the Lightning, she is now showing 100% available power at 96% SOC.

The rest of the evening went perfectly, no additional power reductions, truck performed well the entire night over 185 miles, topped up the truck at Tesla Franklin MA, desolate at 0037 in the morning, completed a 31% to 90% charge I stayed longer because it was cheap rate of 29c/kWh compared to home charging, no one was waiting and I had plenty of time to catch up on emails and text messages from club members.

So, this has happened twice that I recall after doing departure conditioning, I wonder what the cause is?

BTW, I hit a peak rate of ~168 KW about 1 minute from charge startup, used the new adapter that I received last week, worked perfectly, smooth fit, locking mechanism was secure while engaged with the CC1 port on the truck. Rate was 27c (before sales tax) after sales tax 29c, which matched the published rate on the Tesla app which I used to activate the session.

BTW2: No recent OTA updates that would have caused this issue.

56% or 57% is what folks normally report when the front motor fails to initialize properly, I wonder if that is what happened but this time it wasn't related to an update (or maybe an update to a minor module happened in the background).

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[TaxmanHog]

56% or 57% is what folks normally report when the front motor fails to initialize properly, I wonder if that is what happened but this time it wasn't related to an update (or maybe an update to a minor module happened in the background).

Maybe a minor undocumented update may have happened, last week I had the clocks auto update found to be switched off and the time off by 5+ hours.

But, no official update alerts on the Sync screen or Fordpass.

 

[Grumpy2]

In the past couple of months, I've experienced a reduced power output briefly after starting the truck, yesterday was the latest observation.

This would be Worrisome, especially with cold winter behind us.

 

[Piquette]

I’ve seen this pop up a time or two. It usually goes away after shutting off the truck and stepping out for a few minutes. My Ford service tech refers to these events as ”a glitch in the matrix”. Thanks Neo!

 

[TheBigBezo]

I just got the window update overnight and have now encountered a loss of front motor twice. Both times the truck was at 100% power available but at some point on my short drive to and from the grocery store the power dropped to 56% with no warning.

 

[rv7pilot]

56% or 57% is what folks normally report when the front motor fails to initialize properly, I wonder if that is what happened but this time it wasn't related to an update (or maybe an update to a minor module happened in the background).

Just happened to me. Oh well, left Tesla for this.

 

[Heliian]

As I put truck in drive I noticed power output limited to 56%!?

This may be related to the front contactor. You can confirm that when you have that reduced power again, view the power distribution and it will show no power to the front wheels while driving. It may be software related, I don't think there's been any definitive answers, it usually fixes itself.

 

[rv7pilot]

This may be related to the front contactor. You can confirm that when you have that reduced power again, view the power distribution and it will show no power to the front wheels while driving. It may be software related, I don't think there's been any definitive answers, it usually fixes itself.

Good point. If if happens again, I'll check that. One thing that did happen was I got a PAAK glitch and had to shut the truck off, open the door, open FP app, turn the truck back on. I thought maybe it was a valet mode or something. I may delete the PAAK key as it's unreliable anyway. See if that helps.

 

[GoodSam]

Just happened to me.

Goes away? No service indicator? Hope it is just a glitch. But as other suggested, could be more serious, from bad contactors, one of the motors, or one of the 9 HV battery modules. See this thread for Ford safety recall of certain (940?) battery modules traced from a bad manufacturing system 2022 tp 2024:
https://www.f150lightningforum.com/...tery-electrode-misalignment-discussion.25331/
To check if on Ford's Safety Recall 25S18 HV Battery Electrode Misalignment, i.e., due for battery module(s) replacement.
https://www.ford.com/support/recalls/
or FordPass app "service" section.

 

[rv7pilot]

Goes away? No service indicator? Hope it is just a glitch. But as other suggested, could be more serious, from bad contactors, one of the motors, or one of the 9 HV battery modules. See this thread for Ford safety recall of certain (940?) battery modules traced from a bad manufacturing system 2022 tp 2024:
https://www.f150lightningforum.com/...tery-electrode-misalignment-discussion.25331/
To check if on Ford's Safety Recall 25S18 HV Battery Electrode Misalignment, i.e., due for battery module(s) replacement.
https://www.ford.com/support/recalls/
or FordPass app "service" section.

Yes sir, just went away on its on. Came home, parked by the garage to unload groceries, hit the start button and was at 100% again. Weird. Deleted PAAK. I never had an issue in my XLT, ever. Checked all the Recalls and SB's and I'm clear, at least for the HVB anyway.

 

[TaxmanHog]

This may be related to the front contactor. You can confirm that when you have that reduced power again, view the power distribution and it will show no power to the front wheels while driving. It may be software related, I don't think there's been any definitive answers, it usually fixes itself.

If have looked at the motor power on prior incidents but not the one that occured on the 16th of March, previous observations showed no power to the front motor which we've suspected is tied to intermittent HVB contactor(s)

Yesterday I did a road trip to southern NH, but this time only charged to 90% SOC, I did a battery conditioning routine with departure timer, consuming 4.3 KWH to warm battery & cabin, no errors occurred during startup and the trip was uneventful.

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